Add `open_taskman()` design + #485 prompt brief

Two new provenance/planning docs kicking off issue #485 — the
`to_actor.open_taskman()` deferred/non-blocking successor to
the `run_in_actor()` removed by #477/#484.

`ai/conc-anal/to_actor_taskman_design.md` (self-contained
hand-off): the core principle (every non-blocking remote-task
invocation needs an explicitly-owned scope, so NO
`Portal.run_soon()` — the scope-owning `tm` IS the API), the
three prior-art sources to mine (`hilevel_serman` `ServiceMngr`,
PR #363 `trionics` taskman, `piker` `Services`), the
`hilevel_serman` rebase + convergence map (incl. the known
`portal.wait_for_result()` breakage at `_service.py:292`), the
parked-holder core + `run_soon()` API, the
`one_cancels_all`/`collect` strategies + `wait`/`cancel` exit
policies, resolved design items, and the PR A/B/C sequencing.

`ai/prompt-io/prompts/issue_485.md`: the kickoff brief for
PR A — required reading, prior art, + house rules.

Prompt-IO: ai/prompt-io/prompts/issue_485.md

(this patch was generated in some part by `claude-code` using `claude-opus-4-8` (`anthropic`))

.claude/ai_notes/docs_todos.md

@@ -0,0 +1,38 @@
+# Docs TODOs
+
+## Auto-sync README code examples with source
+
+The `docs/README.rst` has inline code blocks that
+duplicate actual example files (e.g.
+`examples/infected_asyncio_echo_server.py`). Every time
+the public API changes we have to manually sync both.
+
+Sphinx's `literalinclude` directive can pull code directly
+from source files:
+
+```rst
+.. literalinclude:: ../examples/infected_asyncio_echo_server.py
+   :language: python
+   :caption: examples/infected_asyncio_echo_server.py
+```
+
+Or to include only a specific function/section:
+
+```rst
+.. literalinclude:: ../examples/infected_asyncio_echo_server.py
+   :language: python
+   :pyobject: aio_echo_server
+```
+
+This way the docs always reflect the actual code without
+manual syncing.
+
+### Considerations
+- `README.rst` is also rendered on GitHub/PyPI which do
+  NOT support `literalinclude` - so we'd need a build
+  step or a separate `_sphinx_readme.rst` (which already
+  exists at `docs/github_readme/_sphinx_readme.rst`).
+- Could use a pre-commit hook or CI step to extract code
+  from examples into the README for GitHub rendering.
+- Another option: `sphinx-autodoc` style approach where
+  docstrings from the actual module are pulled in.

.claude/notes/rt_vars_lift_plan.md

@@ -0,0 +1,125 @@
+# `RuntimeVars` env-var lift — design plan
+
+Status: **draft, awaiting user edits**
+
+## Goal
+
+Consolidate the sprawl of pytest CLI flags + ad-hoc env vars +
+hardcoded fixture defaults into a *single* env-var-encoded
+runtime-vars envelope, with a typed in-memory representation
+(`tractor.runtime._state.RuntimeVars`) as the sole source of
+truth.
+
+## Why now
+
+- `--tpt-proto`, `--spawn-backend`, `--diag-on-hang`,
+  `--diag-capture-delay` and (soon) `TRACTOR_REG_ADDR` etc. are
+  proliferating. Each adds a parsing seam.
+- `tests/devx/test_debugger.py` invokes example scripts as
+  separate subprocesses; they currently can't see the
+  fixture-allocated `reg_addr` at all (root cause of why
+  parametrizing devx scripts on `reg_addr` is on your TODO).
+- Concurrent pytest sessions on the same host collide on
+  shared defaults (the `registry@1616` race we just fixed is
+  one symptom; per-session unique addr is the structural
+  fix).
+- `tractor.runtime._state.RuntimeVars: Struct` is already
+  defined and **unused** — its docstring even says it
+  "should be utilized as possible for future calls."
+
+## Design
+
+### Module: `tractor/_testing/_rtvars.py`
+
+Lifted from `modden.runtime.env`, ~50 LOC, no new deps.
+
+```python
+_TRACTOR_RT_VARS_OSENV: str = '_TRACTOR_RT_VARS'
+
+def dump_rtvars(rtvars: RuntimeVars|dict) -> tuple[str, str]:
+    '''str-serialize via `str(dict)` — ast.literal_eval-able'''
+
+def load_rtvars(env: dict) -> RuntimeVars:
+    '''ast.literal_eval the env-var value, hydrate to struct'''
+
+def get_rtvars(proc: psutil.Process|None = None) -> RuntimeVars:
+    '''read the var from a target proc's env (or current)'''
+
+def update_rtvars(
+    rtvars: RuntimeVars|dict|None = None,
+    update_osenv: bool|dict = True,
+) -> tuple[str, str]:
+    '''mutate + re-encode + (optionally) write to os.environ'''
+```
+
+### Encoding choice: `str(dict)` + `ast.literal_eval`
+
+Pros:
+- stdlib only
+- handles all the types tractor's tests need: `str`, `int`,
+  `float`, `bool`, `None`, `list`, `tuple`, `dict`
+- human-readable in the env (greppable, inspectable via
+  `cat /proc/<pid>/environ | tr '\0' '\n'`)
+
+Cons:
+- non-stdlib types (msgspec Structs, `Path`, custom classes)
+  must be lowered first — fine for the test fixture set
+- not stable across Python versions for esoteric repr cases
+  (we don't hit any)
+
+Alternatives considered:
+- **msgpack**: adds a dep + binary form is ungreppable
+- **json**: doesn't preserve tuples (becomes lists), which is
+  a common type for `reg_addr`
+- **toml/yaml**: heavier deps, no real benefit
+
+### `RuntimeVars` becomes the single source of truth
+
+The legacy `_runtime_vars: dict[str, Any]` global in
+`runtime/_state.py` becomes a *cached view* of a
+`RuntimeVars` singleton instance:
+
+- `get_runtime_vars()` returns either the struct or a
+  `.to_dict()` view depending on caller's preference
+- `set_runtime_vars(...)` validates against the struct schema
+- spawn-time SpawnSpec sends the struct (already does
+  conceptually — just gets typed)
+- `__setattr__` `breakpoint()` debug instrumentation gets
+  removed (unrelated cleanup, mentioned in conversation)
+
+### Migration path
+
+**Phase 0** *(prep)*: strip the stray `breakpoint()` from
+`RuntimeVars.__setattr__`.
+
+**Phase 1**: land `_rtvars.py` as a leaf module, used only by
+test infra. Subprocess-spawned scripts in `tests/devx/`
+read `_TRACTOR_RT_VARS` on startup → reconstruct
+`RuntimeVars` → call `tractor.open_root_actor(**rtvars.as_kwargs())`.
+Concurrent runs become deterministic-isolated because each
+session writes a unique `_registry_addrs` into the env.
+
+**Phase 2**: migrate runtime callers (`_state.get_runtime_vars`,
+spawn `SpawnSpec`, `Actor.async_main`) to operate on the
+struct directly, with the dict as a compat view that gets
+deprecated.
+
+**Phase 3** *(structural)*: per-session bindspace subdir
+`/run/user/<uid>/tractor/<session_uuid>/` — encoded in the
+rt-vars envelope, picked up by every subactor automatically.
+Obsoletes the entire bindspace-leak warning class.
+
+## Open design questions (user input wanted)
+
+- (placeholder for your edits)
+- (placeholder)
+- (placeholder)
+
+## Out-of-scope for this lift
+
+- Anything in `modden.runtime.env` related to `Spawn`,
+  `WmCtl`, `Wks` — that's a workspace orchestration layer,
+  not an env-var helper. We only lift the four utility
+  functions + the var name constant.
+- Switching to msgpack/json — explicitly chosen against
+  above.

.claude/settings.local.json

@@ -0,0 +1,42 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(cp .claude/*)",
+      "Read(.claude/**)",
+      "Read(.claude/skills/run-tests/**)",
+      "Write(.claude/**/*commit_msg*)",
+      "Write(.claude/git_commit_msg_LATEST.md)",
+      "Skill(run-tests)",
+      "Skill(close-wkt)",
+      "Skill(open-wkt)",
+      "Skill(prompt-io)",
+      "Bash(date *)",
+      "Bash(git diff *)",
+      "Bash(git log *)",
+      "Bash(git status)",
+      "Bash(git remote:*)",
+      "Bash(git stash:*)",
+      "Bash(git mv:*)",
+      "Bash(git rev-parse:*)",
+      "Bash(test:*)",
+      "Bash(ls:*)",
+      "Bash(grep:*)",
+      "Bash(find:*)",
+      "Bash(ln:*)",
+      "Bash(cat:*)",
+      "Bash(mkdir:*)",
+      "Bash(gh pr:*)",
+      "Bash(gh api:*)",
+      "Bash(gh issue:*)",
+      "Bash(UV_PROJECT_ENVIRONMENT=py* uv sync:*)",
+      "Bash(UV_PROJECT_ENVIRONMENT=py* uv run:*)",
+      "Bash(echo EXIT:$?:*)",
+      "Bash(echo \"EXIT=$?\")",
+      "Read(/tmp/**)"
+    ],
+    "deny": [],
+    "ask": []
+  },
+  "prefersReducedMotion": false,
+  "outputStyle": "default"
+}

.claude/skills/commit-msg/style-guide-reference.md

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+# Commit Message Style Guide for `tractor`
+
+Analysis based on 500 recent commits from the `tractor` repository.
+
+## Core Principles
+
+Write commit messages that are technically precise yet casual in
+tone. Use abbreviations and informal language while maintaining
+clarity about what changed and why.
+
+## Subject Line Format
+
+### Length and Structure
+- Target: ~50 chars with a hard-max of 67.
+- Use backticks around code elements (72.2% of commits)
+- Rarely use colons (5.2%), except for file prefixes
+- End with '?' for uncertain changes (rare: 0.8%)
+- End with '!' for important changes (rare: 2.0%)
+
+### Opening Verbs (Present Tense)
+
+Most common verbs from analysis:
+- `Add` (14.4%) - wholly new features/functionality
+- `Use` (4.4%) - adopt new approach/tool
+- `Drop` (3.6%) - remove code/feature
+- `Fix` (2.4%) - bug fixes
+- `Move`/`Mv` (3.6%) - relocate code
+- `Adjust` (2.0%) - minor tweaks
+- `Update` (1.6%) - enhance existing feature
+- `Bump` (1.2%) - dependency updates
+- `Rename` (1.2%) - identifier changes
+- `Set` (1.2%) - configuration changes
+- `Handle` (1.0%) - add handling logic
+- `Raise` (1.0%) - add error raising
+- `Pass` (0.8%) - pass parameters/values
+- `Support` (0.8%) - add support for something
+- `Hide` (1.4%) - make private/internal
+- `Always` (1.4%) - enforce consistent behavior
+- `Mk` (1.4%) - make/create (abbreviated)
+- `Start` (1.0%) - begin implementation
+
+Other frequent verbs: `More`, `Change`, `Extend`, `Disable`, `Log`,
+`Enable`, `Ensure`, `Expose`, `Allow`
+
+### Backtick Usage
+
+Always use backticks for:
+- Module names: `trio`, `asyncio`, `msgspec`, `greenback`, `stackscope`
+- Class names: `Context`, `Actor`, `Address`, `PldRx`, `SpawnSpec`
+- Method names: `.pause_from_sync()`, `._pause()`, `.cancel()`
+- Function names: `breakpoint()`, `collapse_eg()`, `open_root_actor()`
+- Decorators: `@acm`, `@context`
+- Exceptions: `Cancelled`, `TransportClosed`, `MsgTypeError`
+- Keywords: `finally`, `None`, `False`
+- Variable names: `tn`, `debug_mode`
+- Complex expressions: `trio.Cancelled`, `asyncio.Task`
+
+Most backticked terms in tractor:
+`trio`, `asyncio`, `Context`, `.pause_from_sync()`, `tn`,
+`._pause()`, `breakpoint()`, `collapse_eg()`, `Actor`, `@acm`,
+`.cancel()`, `Cancelled`, `open_root_actor()`, `greenback`
+
+### Examples
+
+Good subject lines:
+```
+Add `uds` to `._multiaddr`, tweak typing
+Drop `DebugStatus.shield` attr, add `.req_finished`
+Use `stackscope` for all actor-tree rendered "views"
+Fix `.to_asyncio` inter-task-cancellation!
+Bump `ruff.toml` to target py313
+Mv `load_module_from_path()` to new `._code_load` submod
+Always use `tuple`-cast for singleton parent addrs
+```
+
+## Body Format
+
+### General Structure
+- 43.2% of commits have no body (simple changes)
+- Use blank line after subject
+- Max line length: 67 chars
+- Use `-` bullets for lists (28.0% of commits)
+- Rarely use `*` bullets (2.4%)
+
+### Section Markers
+
+Use these markers to organize longer commit bodies:
+- `Also,` (most common: 26 occurrences)
+- `Other,` (13 occurrences)
+- `Deats,` (11 occurrences) - for implementation details
+- `Further,` (7 occurrences)
+- `TODO,` (3 occurrences)
+- `Impl details,` (2 occurrences)
+- `Notes,` (1 occurrence)
+
+### Common Abbreviations
+
+Use these freely (sorted by frequency):
+- `msg` (63) - message
+- `bg` (37) - background
+- `ctx` (30) - context
+- `impl` (27) - implementation
+- `mod` (26) - module
+- `obvi` (17) - obviously
+- `tn` (16) - task name
+- `fn` (15) - function
+- `vs` (15) - versus
+- `bc` (14) - because
+- `var` (14) - variable
+- `prolly` (9) - probably
+- `ep` (6) - entry point
+- `OW` (5) - otherwise
+- `rn` (4) - right now
+- `sig` (4) - signal/signature
+- `deps` (3) - dependencies
+- `iface` (2) - interface
+- `subproc` (2) - subprocess
+- `tho` (2) - though
+- `ofc` (2) - of course
+
+### Tone and Style
+
+- Casual but technical (use `XD` for humor: 23 times)
+- Use `..` for trailing thoughts (108 occurrences)
+- Use `Woops,` to acknowledge mistakes (4 subject lines)
+- Don't be afraid to show personality while being precise
+
+### Example Bodies
+
+Simple with bullets:
+```
+Add `multiaddr` and bump up some deps
+
+Since we're planning to use it for (discovery)
+addressing, allowing replacement of the hacky (pretend)
+attempt in `tractor._multiaddr` Bp
+
+Also pin some deps,
+- make us py312+
+- use `pdbp` with my frame indexing fix.
+- mv to latest `xonsh` for fancy cmd/suggestion injections.
+
+Bump lock file to match obvi!
+```
+
+With section markers:
+```
+Use `stackscope` for all actor-tree rendered "views"
+
+Instead of the (much more) limited and hacky `.devx._code`
+impls, move to using the new `.devx._stackscope` API which
+wraps the `stackscope` project.
+
+Deats,
+- make new `stackscope.extract_stack()` wrapper
+- port over frame-descing to `_stackscope.pformat_stack()`
+- move `PdbREPL` to use `stackscope` render approach
+- update tests for new stack output format
+
+Also,
+- tweak log formatting for consistency
+- add typing hints throughout
+```
+
+## Special Patterns
+
+### WIP Commits
+Rare (0.2%) - avoid committing WIP if possible
+
+### Merge Commits
+Auto-generated (4.4%), don't worry about style
+
+### File References
+- Use `module.py` or `.submodule` style
+- Rarely use `file.py:line` references (0 in analysis)
+
+### Links
+- GitHub links used sparingly (3 total)
+- Prefer code references over external links
+
+## Footer
+
+The default footer should credit `claude` (you) for helping generate
+the commit msg content:
+
+```
+(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
+[claude-code-gh]: https://github.com/anthropics/claude-code
+```
+
+Further, if the patch was solely or in part written
+by `claude`, instead add:
+
+```
+(this patch was generated in some part by [`claude-code`][claude-code-gh])
+[claude-code-gh]: https://github.com/anthropics/claude-code
+```
+
+## Summary Checklist
+
+Before committing, verify:
+- [ ] Subject line uses present tense verb
+- [ ] Subject line ~50 chars (hard max 67)
+- [ ] Code elements wrapped in backticks
+- [ ] Body lines ≤67 chars
+- [ ] Abbreviations used where natural
+- [ ] Casual yet precise tone
+- [ ] Section markers if body >3 paragraphs
+- [ ] Technical accuracy maintained
+
+## Analysis Metadata
+
+```
+Source: tractor repository
+Commits analyzed: 500
+Date range: 2019-2025
+Analysis date: 2026-02-08
+```
+
+---
+
+(this style guide was generated by [`claude-code`][claude-code-gh]
+analyzing commit history)
+
+[claude-code-gh]: https://github.com/anthropics/claude-code

.claude/skills/conc-anal/SKILL.md

@@ -0,0 +1,297 @@
+---
+name: conc-anal
+description: >
+  Concurrency analysis for tractor's trio-based
+  async primitives. Trace task scheduling across
+  checkpoint boundaries, identify race windows in
+  shared mutable state, and verify synchronization
+  correctness. Invoke on code segments the user
+  points at, OR proactively when reviewing/writing
+  concurrent cache, lock, or multi-task acm code.
+argument-hint: "[file:line-range or function name]"
+allowed-tools:
+  - Read
+  - Grep
+  - Glob
+  - Task
+---
+
+Perform a structured concurrency analysis on the
+target code. This skill should be invoked:
+
+- **On demand**: user points at a code segment
+  (file:lines, function name, or pastes a snippet)
+- **Proactively**: when writing or reviewing code
+  that touches shared mutable state across trio
+  tasks — especially `_Cache`, locks, events, or
+  multi-task `@acm` lifecycle management
+
+## 0. Identify the target
+
+If the user provides a file:line-range or function
+name, read that code. If not explicitly provided,
+identify the relevant concurrent code from context
+(e.g. the current diff, a failing test, or the
+function under discussion).
+
+## 1. Inventory shared mutable state
+
+List every piece of state that is accessed by
+multiple tasks. For each, note:
+
+- **What**: the variable/dict/attr (e.g.
+  `_Cache.values`, `_Cache.resources`,
+  `_Cache.users`)
+- **Scope**: class-level, module-level, or
+  closure-captured
+- **Writers**: which tasks/code-paths mutate it
+- **Readers**: which tasks/code-paths read it
+- **Guarded by**: which lock/event/ordering
+  protects it (or "UNGUARDED" if none)
+
+Format as a table:
+
+```
+| State               | Writers         | Readers         | Guard          |
+|---------------------|-----------------|-----------------|----------------|
+| _Cache.values       | run_ctx, moc¹   | moc             | ctx_key lock   |
+| _Cache.resources    | run_ctx, moc    | moc, run_ctx    | UNGUARDED      |
+```
+
+¹ `moc` = `maybe_open_context`
+
+## 2. Map checkpoint boundaries
+
+For each code path through the target, mark every
+**checkpoint** — any `await` expression where trio
+can switch to another task. Use line numbers:
+
+```
+L325: await lock.acquire()        ← CHECKPOINT
+L395: await service_tn.start(...) ← CHECKPOINT
+L411: lock.release()              ← (not a checkpoint, but changes lock state)
+L414: yield (False, yielded)      ← SUSPEND (caller runs)
+L485: no_more_users.set()         ← (wakes run_ctx, no switch yet)
+```
+
+**Key trio scheduling rules to apply:**
+- `Event.set()` makes waiters *ready* but does NOT
+  switch immediately
+- `lock.release()` is not a checkpoint
+- `await sleep(0)` IS a checkpoint
+- Code in `finally` blocks CAN have checkpoints
+  (unlike asyncio)
+- `await` inside `except` blocks can be
+  `trio.Cancelled`-masked
+
+## 3. Trace concurrent task schedules
+
+Write out the **interleaved execution trace** for
+the problematic scenario. Number each step and tag
+which task executes it:
+
+```
+[Task A]  1. acquires lock
+[Task A]  2. cache miss → allocates resources
+[Task A]  3. releases lock
+[Task A]  4. yields to caller
+[Task A]  5. caller exits → finally runs
+[Task A]  6. users-- → 0, sets no_more_users
+[Task A]  7. pops lock from _Cache.locks
+[run_ctx] 8. wakes from no_more_users.wait()
+[run_ctx] 9. values.pop(ctx_key)
+[run_ctx] 10. acm __aexit__ → CHECKPOINT
+[Task B]  11. creates NEW lock (old one popped)
+[Task B]  12. acquires immediately
+[Task B]  13. values[ctx_key] → KeyError
+[Task B]  14. resources[ctx_key] → STILL EXISTS
+[Task B]  15. 💥 RuntimeError
+```
+
+Identify the **race window**: the range of steps
+where state is inconsistent. In the example above,
+steps 9–10 are the window (values gone, resources
+still alive).
+
+## 4. Classify the bug
+
+Categorize what kind of concurrency issue this is:
+
+- **TOCTOU** (time-of-check-to-time-of-use): state
+  changes between a check and the action based on it
+- **Stale reference**: a task holds a reference to
+  state that another task has invalidated
+- **Lifetime mismatch**: a synchronization primitive
+  (lock, event) has a shorter lifetime than the
+  state it's supposed to protect
+- **Missing guard**: shared state is accessed
+  without any synchronization
+- **Atomicity gap**: two operations that should be
+  atomic have a checkpoint between them
+
+## 5. Propose fixes
+
+For each proposed fix, provide:
+
+- **Sketch**: pseudocode or diff showing the change
+- **How it closes the window**: which step(s) from
+  the trace it eliminates or reorders
+- **Tradeoffs**: complexity, perf, new edge cases,
+  impact on other code paths
+- **Risk**: what could go wrong (deadlocks, new
+  races, cancellation issues)
+
+Rate each fix: `[simple|moderate|complex]` impl
+effort.
+
+## 6. Output format
+
+Structure the full analysis as:
+
+```markdown
+## Concurrency analysis: `<target>`
+
+### Shared state
+<table from step 1>
+
+### Checkpoints
+<list from step 2>
+
+### Race trace
+<interleaved trace from step 3>
+
+### Classification
+<bug type from step 4>
+
+### Fixes
+<proposals from step 5>
+```
+
+## Tractor-specific patterns to watch
+
+These are known problem areas in tractor's
+concurrency model. Flag them when encountered:
+
+### `_Cache` lock vs `run_ctx` lifetime
+
+The `_Cache.locks` entry is managed by
+`maybe_open_context` callers, but `run_ctx` runs
+in `service_tn` — a different task tree. Lock
+pop/release in the caller's `finally` does NOT
+wait for `run_ctx` to finish tearing down. Any
+state that `run_ctx` cleans up in its `finally`
+(e.g. `resources.pop()`) is vulnerable to
+re-entry races after the lock is popped.
+
+### `values.pop()` → acm `__aexit__` → `resources.pop()` gap
+
+In `_Cache.run_ctx`, the inner `finally` pops
+`values`, then the acm's `__aexit__` runs (which
+has checkpoints), then the outer `finally` pops
+`resources`. This creates a window where `values`
+is gone but `resources` still exists — a classic
+atomicity gap.
+
+### Global vs per-key counters
+
+`_Cache.users` as a single `int` (pre-fix) meant
+that users of different `ctx_key`s inflated each
+other's counts, preventing teardown when one key's
+users hit zero. Always verify that per-key state
+(`users`, `locks`) is actually keyed on `ctx_key`
+and not on `fid` or some broader key.
+
+### `Event.set()` wakes but doesn't switch
+
+`trio.Event.set()` makes waiting tasks *ready* but
+the current task continues executing until its next
+checkpoint. Code between `.set()` and the next
+`await` runs atomically from the scheduler's
+perspective. Use this to your advantage (or watch
+for bugs where code assumes the woken task runs
+immediately).
+
+### `except` block checkpoint masking
+
+`await` expressions inside `except` handlers can
+be masked by `trio.Cancelled`. If a `finally`
+block runs from an `except` and contains
+`lock.release()`, the release happens — but any
+`await` after it in the same `except` may be
+swallowed. This is why `maybe_open_context`'s
+cache-miss path does `lock.release()` in a
+`finally` inside the `except KeyError`.
+
+### Cancellation in `finally`
+
+Unlike asyncio, trio allows checkpoints in
+`finally` blocks. This means `finally` cleanup
+that does `await` can itself be cancelled (e.g.
+by nursery shutdown). Watch for cleanup code that
+assumes it will run to completion.
+
+### Unbounded waits in cleanup paths
+
+Any `await <event>.wait()` in a teardown path is
+a latent deadlock unless the event's setter is
+GUARANTEED to fire. If the setter depends on
+external state (peer disconnects, child process
+exit, subsequent task completion) that itself
+depends on the current task's progress, you have
+a mutual wait.
+
+Rule: **bound every `await X.wait()` in cleanup
+paths with `trio.move_on_after()`** unless you
+can prove the setter is unconditionally reachable
+from the state at the await site. Concrete recent
+example: `ipc_server.wait_for_no_more_peers()` in
+`async_main`'s finally (see
+`ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md`
+"probe iteration 3") — it was unbounded, and when
+one peer-handler was stuck the wait-for-no-more-
+peers event never fired, deadlocking the whole
+actor-tree teardown cascade.
+
+### The capture-pipe-fill hang pattern (grep this first)
+
+When investigating any hang in the test suite
+**especially under fork-based backends**, first
+check whether the hang reproduces under `pytest
+-s` (`--capture=no`). If `-s` makes it go away
+you're not looking at a trio concurrency bug —
+you're looking at a Linux pipe-buffer fill.
+
+Mechanism: pytest replaces fds 1,2 with pipe
+write-ends. Fork-child subactors inherit those
+fds. High-volume error-log tracebacks (cancel
+cascade spew) fill the 64KB pipe buffer. Child
+`write()` blocks. Child can't exit. Parent's
+`waitpid`/pidfd wait blocks. Deadlock cascades up
+the tree.
+
+Pre-existing guards in `tests/conftest.py` encode
+this knowledge — grep these BEFORE blaming
+concurrency:
+
+```python
+# tests/conftest.py:258
+if loglevel in ('trace', 'debug'):
+    # XXX: too much logging will lock up the subproc (smh)
+    loglevel: str = 'info'
+
+# tests/conftest.py:316
+# can lock up on the `_io.BufferedReader` and hang..
+stderr: str = proc.stderr.read().decode()
+```
+
+Full post-mortem +
+`ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md`
+for the canonical reproduction. Cost several
+investigation sessions before catching it —
+because the capture-pipe symptom was masked by
+deeper cascade-deadlocks. Once the cascades were
+fixed, the tree tore down enough to generate
+pipe-filling log volume → capture-pipe finally
+surfaced. Grep-note for future-self: **if a
+multi-subproc tractor test hangs, `pytest -s`
+first, conc-anal second.**

.claude/skills/pr-msg/format-reference.md

@@ -0,0 +1,241 @@
+# PR/Patch-Request Description Format Reference
+
+Canonical structure for `tractor` patch-request
+descriptions, designed to work across GitHub,
+Gitea, SourceHut, and GitLab markdown renderers.
+
+**Line length: wrap at 72 chars** for all prose
+content (Summary bullets, Motivation paragraphs,
+Scopes bullets, etc.). Fill lines *to* 72 — don't
+stop short at 50-65. Only raw URLs in
+reference-link definitions may exceed this.
+
+## Template
+
+```markdown
+<!-- pr-msg-meta
+branch: <branch-name>
+base: <base-branch>
+submitted:
+  github: ___
+  gitea: ___
+  srht: ___
+-->
+
+## <Title: present-tense verb + backticked code>
+
+### Summary
+- [<hash>][<hash>] Description of change ending
+  with period.
+- [<hash>][<hash>] Another change description
+  ending with period.
+- [<hash>][<hash>] [<hash>][<hash>] Multi-commit
+  change description.
+
+### Motivation
+<1-2 paragraphs: problem/limitation first,
+then solution. Hard-wrap at 72 chars.>
+
+### Scopes changed
+- [<hash>][<hash>] `pkg.mod.func()` — what
+  changed.
+  * [<hash>][<hash>] Also adjusts
+    `.related_thing()` in same module.
+- [<hash>][<hash>] `tests.test_mod` — new/changed
+  test coverage.
+
+<!--
+### Cross-references
+Also submitted as
+[github-pr][] | [gitea-pr][] | [srht-patch][].
+
+### Links
+- [relevant-issue-or-discussion](url)
+- [design-doc-or-screenshot](url)
+-->
+
+(this pr content was generated in some part by
+[`claude-code`][claude-code-gh])
+
+[<hash>]: https://<service>/<owner>/<repo>/commit/<hash>
+[claude-code-gh]: https://github.com/anthropics/claude-code
+
+<!-- cross-service pr refs (fill after submit):
+[github-pr]: https://github.com/<owner>/<repo>/pull/___
+[gitea-pr]: https://<host>/<owner>/<repo>/pulls/___
+[srht-patch]: https://git.sr.ht/~<owner>/<repo>/patches/___
+-->
+```
+
+## Markdown Reference-Link Strategy
+
+Use reference-style links for ALL commit hashes
+and cross-service PR refs to ensure cross-service
+compatibility:
+
+**Inline usage** (in bullets):
+```markdown
+- [f3726cf9][f3726cf9] Add `reg_err_types()`
+  for custom exc lookup.
+```
+
+**Definition** (bottom of document):
+```markdown
+[f3726cf9]: https://github.com/goodboy/tractor/commit/f3726cf9
+```
+
+### Why reference-style?
+- Keeps prose readable without long inline URLs.
+- All URLs in one place — trivially swappable
+  per-service.
+- Most git services auto-link bare SHAs anyway,
+  but explicit refs guarantee it works in *any*
+  md renderer.
+- The `[hash][hash]` form is self-documenting —
+  display text matches the ref ID.
+- Cross-service PR refs use the same mechanism:
+  `[github-pr][]` resolves via a ref-link def
+  at the bottom, trivially fillable post-submit.
+
+## Cross-Service PR Placeholder Mechanism
+
+The generated description includes three layers
+of cross-service support, all using native md
+reference-links:
+
+### 1. Metadata comment (top of file)
+
+```markdown
+<!-- pr-msg-meta
+branch: remote_exc_type_registry
+base: main
+submitted:
+  github: ___
+  gitea: ___
+  srht: ___
+-->
+```
+
+A YAML-ish HTML comment block. The `___`
+placeholders get filled with PR/patch numbers
+after submission. Machine-parseable for tooling
+(e.g. `gish`) but invisible in rendered md.
+
+### 2. Cross-references section (in body)
+
+```markdown
+<!--
+### Cross-references
+Also submitted as
+[github-pr][] | [gitea-pr][] | [srht-patch][].
+-->
+```
+
+Commented out at generation time. After submitting
+to multiple services, uncomment and the ref-links
+resolve via the stubs at the bottom.
+
+### 3. Ref-link stubs (bottom of file)
+
+```markdown
+<!-- cross-service pr refs (fill after submit):
+[github-pr]: https://github.com/goodboy/tractor/pull/___
+[gitea-pr]: https://pikers.dev/goodboy/tractor/pulls/___
+[srht-patch]: https://git.sr.ht/~goodboy/tractor/patches/___
+-->
+```
+
+Commented out with `___` number placeholders.
+After submission: uncomment, replace `___` with
+the actual number. Each service-specific copy
+fills in all services' numbers so any copy can
+cross-reference the others.
+
+### Post-submission file layout
+
+```
+pr_msg_LATEST.md                    # latest draft (skill root)
+msgs/
+  20260325T002027Z_mybranch_pr_msg.md  # timestamped
+  github/
+    42_pr_msg.md        # github PR #42
+  gitea/
+    17_pr_msg.md        # gitea PR #17
+  srht/
+    5_pr_msg.md         # srht patch #5
+```
+
+Each `<service>/<num>_pr_msg.md` is a copy with:
+- metadata `submitted:` fields filled in
+- cross-references section uncommented
+- ref-link stubs uncommented with real numbers
+- all services cross-linked in each copy
+
+This mirrors the `gish` skill's
+`<backend>/<num>.md` pattern.
+
+## Commit-Link URL Patterns by Service
+
+| Service   | Pattern                             |
+|-----------|-------------------------------------|
+| GitHub    | `https://github.com/<o>/<r>/commit/<h>` |
+| Gitea     | `https://<host>/<o>/<r>/commit/<h>` |
+| SourceHut | `https://git.sr.ht/~<o>/<r>/commit/<h>` |
+| GitLab    | `https://gitlab.com/<o>/<r>/-/commit/<h>` |
+
+## PR/Patch URL Patterns by Service
+
+| Service   | Pattern                             |
+|-----------|-------------------------------------|
+| GitHub    | `https://github.com/<o>/<r>/pull/<n>` |
+| Gitea     | `https://<host>/<o>/<r>/pulls/<n>`  |
+| SourceHut | `https://git.sr.ht/~<o>/<r>/patches/<n>` |
+| GitLab    | `https://gitlab.com/<o>/<r>/-/merge_requests/<n>` |
+
+## Scope Naming Convention
+
+Use Python namespace-resolution syntax for
+referencing changed code scopes:
+
+| File path                 | Scope reference               |
+|---------------------------|-------------------------------|
+| `tractor/_exceptions.py`  | `tractor._exceptions`         |
+| `tractor/_state.py`       | `tractor._state`              |
+| `tests/test_foo.py`       | `tests.test_foo`              |
+| Function in module        | `tractor._exceptions.func()`  |
+| Method on class           | `.RemoteActorError.src_type`  |
+| Class                     | `tractor._exceptions.RAE`     |
+
+Prefix with the package path for top-level refs;
+use leading-dot shorthand (`.ClassName.method()`)
+for sub-bullets where the parent module is already
+established.
+
+## Title Conventions
+
+Same verb vocabulary as commit messages:
+- `Add` — wholly new feature/API
+- `Fix` — bug fix
+- `Drop` — removal
+- `Use` — adopt new approach
+- `Move`/`Mv` — relocate code
+- `Adjust` — minor tweak
+- `Update` — enhance existing feature
+- `Support` — add support for something
+
+Target 50 chars, hard max 70. Always backtick
+code elements.
+
+## Tone
+
+Casual yet technically precise — matching the
+project's commit-msg style. Terse but every bullet
+carries signal. Use project abbreviations freely
+(msg, bg, ctx, impl, mod, obvi, fn, bc, var,
+prolly, ep, etc.).
+
+---
+
+(this format reference was generated by
+[`claude-code`][claude-code-gh])
+[claude-code-gh]: https://github.com/anthropics/claude-code

.claude/skills/run-tests/SKILL.md

@@ -0,0 +1,632 @@
+---
+name: run-tests
+description: >
+  Run tractor test suite (or subsets). Use when the user wants
+  to run tests, verify changes, or check for regressions.
+argument-hint: "[test-path-or-pattern] [--opts]"
+allowed-tools:
+  - Bash(python -m pytest *)
+  - Bash(python -c *)
+  - Bash(python --version *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv run python *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv run pytest *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv sync *)
+  - Bash(UV_PROJECT_ENVIRONMENT=py* uv pip show *)
+  - Bash(git rev-parse *)
+  - Bash(ls *)
+  - Bash(cat *)
+  - Bash(jq * .pytest_cache/*)
+  # process inspection + SIGINT-first cleanup ladder (see
+  # the zombie-actor pre-flight / teardown steps below).
+  - Bash(ss *)
+  - Bash(pgrep *)
+  - Bash(pkill *)
+  - Bash(sleep *)
+  - Bash(rm -f /tmp/registry@*.sock)
+  - Read
+  - Grep
+  - Glob
+  - Task
+  - AskUserQuestion
+---
+
+Run the `tractor` test suite using `pytest`. Follow this
+process:
+
+## 1. Parse user intent
+
+From the user's message and any arguments, determine:
+
+- **scope**: full suite, specific file(s), specific
+  test(s), or a keyword pattern (`-k`).
+- **transport**: which IPC transport protocol to test
+  against (default: `tcp`, also: `uds`).
+- **options**: any extra pytest flags the user wants
+  (e.g. `--ll debug`, `--tpdb`, `-x`, `-v`).
+
+If the user provides a bare path or pattern as argument,
+treat it as the test target. Examples:
+
+- `/run-tests` → full suite
+- `/run-tests test_local.py` → single file
+- `/run-tests test_registrar -v` → file + verbose
+- `/run-tests -k cancel` → keyword filter
+- `/run-tests tests/ipc/ --tpt-proto uds` → subdir + UDS
+
+## 2. Construct the pytest command
+
+Base command:
+```
+python -m pytest
+```
+
+### Default flags (always include unless user overrides):
+- `-x` (stop on first failure)
+- `--tb=short` (concise tracebacks)
+- `--no-header` (reduce noise)
+
+### Path resolution:
+- If the user gives a bare filename like `test_local.py`,
+  resolve it under `tests/`.
+- If the user gives a subdirectory like `ipc/`, resolve
+  under `tests/ipc/`.
+- Glob if needed: `tests/**/test_*<pattern>*.py`
+
+### Key pytest options for this project:
+
+| Flag | Purpose |
+|---|---|
+| `--ll <level>` | Set tractor log level (e.g. `debug`, `info`, `runtime`) |
+| `--tpdb` / `--debug-mode` | Enable tractor's multi-proc debugger |
+| `--tpt-proto <key>` | IPC transport: `tcp` (default) or `uds` |
+| `--spawn-backend <be>` | Spawn method: `trio` (default), `mp_spawn`, `mp_forkserver` |
+| `-k <expr>` | pytest keyword filter |
+| `-v` / `-vv` | Verbosity |
+| `-s` | No output capture (useful with `--tpdb`) |
+
+### Common combos:
+```sh
+# quick smoke test of core modules
+python -m pytest tests/test_local.py tests/test_rpc.py -x --tb=short --no-header
+
+# full suite, stop on first failure
+python -m pytest tests/ -x --tb=short --no-header
+
+# specific test with debug
+python -m pytest tests/discovery/test_registrar.py::test_reg_then_unreg -x -s --tpdb --ll debug
+
+# run with UDS transport
+python -m pytest tests/ -x --tb=short --no-header --tpt-proto uds
+
+# keyword filter
+python -m pytest tests/ -x --tb=short --no-header -k "cancel and not slow"
+```
+
+## 3. Pre-flight: venv detection (MANDATORY)
+
+**Always verify a `uv` venv is active before running
+`python` or `pytest`.** This project uses
+`UV_PROJECT_ENVIRONMENT=py<MINOR>` naming (e.g.
+`py313`) — never `.venv`.
+
+### Step 1: detect active venv
+
+Run this check first:
+
+```sh
+python -c "
+import sys, os
+venv = os.environ.get('VIRTUAL_ENV', '')
+prefix = sys.prefix
+print(f'VIRTUAL_ENV={venv}')
+print(f'sys.prefix={prefix}')
+print(f'executable={sys.executable}')
+"
+```
+
+### Step 2: interpret results
+
+**Case A — venv is active** (`VIRTUAL_ENV` is set
+and points to a `py<MINOR>/` dir under the project
+root or worktree):
+
+Use bare `python` / `python -m pytest` for all
+commands. This is the normal, fast path.
+
+**Case B — no venv active** (`VIRTUAL_ENV` is empty
+or `sys.prefix` points to a system Python):
+
+Use `AskUserQuestion` to ask the user:
+
+> "No uv venv is active. Should I activate one
+> via `UV_PROJECT_ENVIRONMENT=py<MINOR> uv sync`,
+> or would you prefer to activate your shell venv
+> first?"
+
+Options:
+1. **"Create/sync venv"** — run
+   `UV_PROJECT_ENVIRONMENT=py<MINOR> uv sync` where
+   `<MINOR>` is detected from `python --version`
+   (e.g. `313` for 3.13). Then use
+   `py<MINOR>/bin/python` for all subsequent
+   commands in this session.
+2. **"I'll activate it myself"** — stop and let the
+   user `source py<MINOR>/bin/activate` or similar.
+
+**Case C — inside a git worktree** (`git rev-parse
+--git-common-dir` differs from `--git-dir`):
+
+Verify Python resolves from the **worktree's own
+venv**, not the main repo's:
+
+```sh
+python -c "import tractor; print(tractor.__file__)"
+```
+
+If the path points outside the worktree, create a
+worktree-local venv:
+
+```sh
+UV_PROJECT_ENVIRONMENT=py<MINOR> uv sync
+```
+
+Then use `py<MINOR>/bin/python` for all commands.
+
+**Why this matters**: without the correct venv,
+subprocesses spawned by tractor resolve modules
+from the wrong editable install, causing spurious
+`AttributeError` / `ModuleNotFoundError`.
+
+### Fallback: `uv run`
+
+If the user can't or won't activate a venv, all
+`python` and `pytest` commands can be prefixed
+with `UV_PROJECT_ENVIRONMENT=py<MINOR> uv run`:
+
+```sh
+# instead of: python -m pytest tests/ -x
+UV_PROJECT_ENVIRONMENT=py313 uv run pytest tests/ -x
+
+# instead of: python -c 'import tractor'
+UV_PROJECT_ENVIRONMENT=py313 uv run python -c 'import tractor'
+```
+
+`uv run` auto-discovers the project and venv,
+but is slower than a pre-activated venv due to
+lock-file resolution on each invocation. Prefer
+activating the venv when possible.
+
+### Step 3: import + collection checks
+
+After venv is confirmed, always run these
+(especially after refactors or module moves):
+
+```sh
+# 1. package import smoke check
+python -c 'import tractor; print(tractor)'
+
+# 2. verify all tests collect (no import errors)
+python -m pytest tests/ -x -q --co 2>&1 | tail -5
+```
+
+If either fails, fix the import error before running
+any actual tests.
+
+### Step 4: zombie-actor / stale-registry check (MANDATORY)
+
+The tractor runtime's default registry address is
+**`127.0.0.1:1616`** (TCP) / `/tmp/registry@1616.sock`
+(UDS). Whenever any prior test run — especially one
+using a fork-based backend like `subint_forkserver` —
+leaks a child actor process, that zombie keeps the
+registry port bound and **every subsequent test
+session fails to bind**, often presenting as 50+
+unrelated failures ("all tests broken"!) across
+backends.
+
+**This has to be checked before the first run AND
+after any cancelled/SIGINT'd run** — signal failures
+in the middle of a test can leave orphan children.
+
+```sh
+# 1. TCP registry — any listener on :1616? (primary signal)
+ss -tlnp 2>/dev/null | grep ':1616' || echo 'TCP :1616 free'
+
+# 2. leftover actor/forkserver procs — scoped to THIS
+#    repo's python path, so we don't false-flag legit
+#    long-running tractor-using apps (e.g. `piker`,
+#    downstream projects that embed tractor).
+pgrep -af "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv" \
+  | grep -v 'grep\|pgrep' \
+  || echo 'no leaked actor procs from this repo'
+
+# 3. stale UDS registry sockets
+ls -la /tmp/registry@*.sock 2>/dev/null \
+  || echo 'no leaked UDS registry sockets'
+```
+
+**Interpretation:**
+
+- **TCP :1616 free AND no stale sockets** → clean,
+  proceed. The actor-procs probe is secondary — false
+  positives are common (piker, any other tractor-
+  embedding app); only cleanup if `:1616` is bound or
+  sockets linger.
+- **TCP :1616 bound OR stale sockets present** →
+  surface PIDs + cmdlines to the user, offer cleanup:
+
+  ```sh
+  # 1. GRACEFUL FIRST (tractor is structured concurrent — it
+  #    catches SIGINT as an OS-cancel in `_trio_main` and
+  #    cascades Portal.cancel_actor via IPC to every descendant.
+  #    So always try SIGINT first with a bounded timeout; only
+  #    escalate to SIGKILL if graceful cleanup doesn't complete).
+  pkill -INT -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv"
+
+  # 2. bounded wait for graceful teardown (usually sub-second).
+  #    Loop until the processes exit, or timeout. Keep the
+  #    bound tight — hung/abrupt-killed descendants usually
+  #    hang forever, so don't wait more than a few seconds.
+  for i in $(seq 1 10); do
+    pgrep -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv" >/dev/null || break
+    sleep 0.3
+  done
+
+  # 3. ESCALATE TO SIGKILL only if graceful didn't finish.
+  if pgrep -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv" >/dev/null; then
+    echo 'graceful teardown timed out — escalating to SIGKILL'
+    pkill -9 -f "$(pwd)/py[0-9]*/bin/python.*_actor_child_main|subint-forkserv"
+  fi
+
+  # 4. if a test zombie holds :1616 specifically and doesn't
+  #    match the above pattern, find its PID the hard way:
+  ss -tlnp 2>/dev/null | grep ':1616'   # prints `users:(("<name>",pid=NNNN,...))`
+  # then (same SIGINT-first ladder):
+  # kill -INT <NNNN>; sleep 1; kill -9 <NNNN> 2>/dev/null
+
+  # 5. remove stale UDS sockets
+  rm -f /tmp/registry@*.sock
+
+  # 6. re-verify
+  ss -tlnp 2>/dev/null | grep ':1616' || echo 'TCP :1616 now free'
+  ```
+
+**Never ignore stale registry state.** If you see the
+"all tests failing" pattern — especially
+`trio.TooSlowError` / connection refused / address in
+use on many unrelated tests — check registry **before**
+spelunking into test code. The failure signature will
+be identical across backends because they're all
+fighting for the same port.
+
+**False-positive warning for step 2:** a plain
+`pgrep -af '_actor_child_main'` will also match
+legit long-running tractor-embedding apps (e.g.
+`piker` at `~/repos/piker/py*/bin/python3 -m
+tractor._child ...`). Always scope to the current
+repo's python path, or only use step 1 (`:1616`) as
+the authoritative signal.
+
+## 4. Run and report
+
+- Run the constructed command.
+- Use a timeout of **600000ms** (10min) for full suite
+  runs, **120000ms** (2min) for single-file runs.
+- If the suite is large (full `tests/`), consider running
+  in the background and checking output when done.
+- Use `--lf` (last-failed) to re-run only previously
+  failing tests when iterating on a fix.
+
+### On failure:
+- Show the failing test name(s) and short traceback.
+- If the failure looks related to recent changes, point
+  out the likely cause and suggest a fix.
+- **Check the known-flaky list** (section 8) before
+  investigating — don't waste time on pre-existing
+  timeout issues.
+- **NEVER auto-commit fixes.** If you apply a code fix
+  during test iteration, leave it unstaged. Tell the
+  user what changed and suggest they review the
+  worktree state, stage files manually, and use
+  `/commit-msg` (inline or in a separate session) to
+  generate the commit message. The human drives all
+  `git add` and `git commit` operations.
+
+### On success:
+- Report the pass/fail/skip counts concisely.
+
+## 5. Test directory layout (reference)
+
+```
+tests/
+├── conftest.py          # root fixtures, daemon, signals
+├── devx/                # debugger/tooling tests
+├── ipc/                 # transport protocol tests
+├── msg/                 # messaging layer tests
+├── discovery/           # discovery subsystem tests
+│   ├── test_multiaddr.py  # multiaddr construction
+│   └── test_registrar.py  # registry/discovery protocol
+├── test_local.py        # registrar + local actor basics
+├── test_rpc.py          # RPC error handling
+├── test_spawning.py     # subprocess spawning
+├── test_multi_program.py  # multi-process tree tests
+├── test_cancellation.py # cancellation semantics
+├── test_context_stream_semantics.py  # ctx streaming
+├── test_inter_peer_cancellation.py   # peer cancel
+├── test_infected_asyncio.py  # trio-in-asyncio
+└── ...
+```
+
+## 6. Change-type → test mapping
+
+After modifying specific modules, run the corresponding
+test subset first for fast feedback:
+
+| Changed module(s) | Run these tests first |
+|---|---|
+| `runtime/_runtime.py`, `runtime/_state.py` | `test_local.py test_rpc.py test_spawning.py test_root_runtime.py` |
+| `discovery/` (`_registry`, `_discovery`, `_addr`) | `tests/discovery/ test_multi_program.py test_local.py` |
+| `_context.py`, `_streaming.py` | `test_context_stream_semantics.py test_advanced_streaming.py` |
+| `ipc/` (`_chan`, `_server`, `_transport`) | `tests/ipc/ test_2way.py` |
+| `runtime/_portal.py`, `runtime/_rpc.py` | `test_rpc.py test_cancellation.py` |
+| `spawn/` (`_spawn`, `_entry`) | `test_spawning.py test_multi_program.py` |
+| `devx/debug/` | `tests/devx/test_debugger.py` (slow!) |
+| `to_asyncio.py` | `test_infected_asyncio.py test_root_infect_asyncio.py` |
+| `msg/` | `tests/msg/` |
+| `_exceptions.py` | `test_remote_exc_relay.py test_inter_peer_cancellation.py` |
+| `runtime/_supervise.py` | `test_cancellation.py test_spawning.py` |
+
+## 7. Quick-check shortcuts
+
+### After refactors (fastest first-pass):
+```sh
+# import + collect check
+python -c 'import tractor' && python -m pytest tests/ -x -q --co 2>&1 | tail -3
+
+# core subset (~10s)
+python -m pytest tests/test_local.py tests/test_rpc.py tests/test_spawning.py tests/discovery/test_registrar.py -x --tb=short --no-header
+```
+
+### Inspect last failures (without re-running):
+
+When the user asks "what failed?", "show failures",
+or wants to check the last-failed set before
+re-running — read the pytest cache directly. This
+is instant and avoids test collection overhead.
+
+```sh
+python -c "
+import json, pathlib, sys
+p = pathlib.Path('.pytest_cache/v/cache/lastfailed')
+if not p.exists():
+    print('No lastfailed cache found.'); sys.exit()
+data = json.loads(p.read_text())
+# filter to real test node IDs (ignore junk
+# entries that can accumulate from system paths)
+tests = sorted(k for k in data if k.startswith('tests/'))
+if not tests:
+    print('No failures recorded.')
+else:
+    print(f'{len(tests)} last-failed test(s):')
+    for t in tests:
+        print(f'  {t}')
+"
+```
+
+**Why not `--cache-show` or `--co --lf`?**
+
+- `pytest --cache-show 'cache/lastfailed'` works
+  but dumps raw dict repr including junk entries
+  (stale system paths that leak into the cache).
+- `pytest --co --lf` actually *collects* tests which
+  triggers import resolution and is slow (~0.5s+).
+  Worse, when cached node IDs don't exactly match
+  current parametrize IDs (e.g. param names changed
+  between runs), pytest falls back to collecting
+  the *entire file*, giving false positives.
+- Reading the JSON directly is instant, filterable
+  to `tests/`-prefixed entries, and shows exactly
+  what pytest recorded — no interpretation.
+
+**After inspecting**, re-run the failures:
+```sh
+python -m pytest --lf -x --tb=short --no-header
+```
+
+### Full suite in background:
+When core tests pass and you want full coverage while
+continuing other work, run in background:
+```sh
+python -m pytest tests/ -x --tb=short --no-header -q
+```
+(use `run_in_background=true` on the Bash tool)
+
+## 8. Known flaky tests
+
+These tests have **pre-existing** timing/environment
+sensitivity. If they fail with `TooSlowError` or
+pexpect `TIMEOUT`, they are almost certainly NOT caused
+by your changes — note them and move on.
+
+| Test | Typical error | Notes |
+|---|---|---|
+| `devx/test_debugger.py::test_multi_nested_subactors_error_through_nurseries` | pexpect TIMEOUT | Debugger pexpect timing |
+| `test_cancellation.py::test_cancel_via_SIGINT_other_task` | TooSlowError | Signal handling race |
+| `test_inter_peer_cancellation.py::test_peer_spawns_and_cancels_service_subactor` | TooSlowError | Async timing (both param variants) |
+| `test_docs_examples.py::test_example[we_are_processes.py]` | `assert None == 0` | `__main__` missing `__file__` in subproc |
+
+**Rule of thumb**: if a test fails with `TooSlowError`,
+`trio.TooSlowError`, or `pexpect.TIMEOUT` and you didn't
+touch the relevant code path, it's flaky — skip it.
+
+## 9. The pytest-capture hang pattern (CHECK THIS FIRST)
+
+**Symptom:** a tractor test hangs indefinitely under
+default `pytest` but passes instantly when you add
+`-s` (`--capture=no`).
+
+**Cause:** tractor subactors (especially under fork-
+based backends) inherit pytest's stdout/stderr
+capture pipes via fds 1,2. Under high-volume error
+logging (e.g. multi-level cancel cascade, nested
+`run_in_actor` failures, anything triggering
+`RemoteActorError` + `ExceptionGroup` traceback
+spew), the **64KB Linux pipe buffer fills** faster
+than pytest drains it. Subactor writes block → can't
+finish exit → parent's `waitpid`/pidfd wait blocks →
+deadlock cascades up the tree.
+
+**Pre-existing guards in the tractor harness** that
+encode this same knowledge — grep these FIRST
+before spelunking:
+
+- `tests/conftest.py:258-260` (in the `daemon`
+  fixture): `# XXX: too much logging will lock up
+  the subproc (smh)` — downgrades `trace`/`debug`
+  loglevel to `info` to prevent the hang.
+- `tests/conftest.py:316`: `# can lock up on the
+  _io.BufferedReader and hang..` — noted on the
+  `proc.stderr.read()` post-SIGINT.
+
+**Debug recipe (in priority order):**
+
+1. **Try `-s` first.** If the hang disappears with
+   `pytest -s`, you've confirmed it's capture-pipe
+   fill. Skip spelunking.
+2. **Lower the loglevel.** Default `--ll=error` on
+   this project; if you've bumped it to `debug` /
+   `info`, try dropping back. Each log level
+   multiplies pipe-pressure under fault cascades.
+3. **If you MUST use default capture + high log
+   volume**, redirect subactor stdout/stderr in the
+   child prelude (e.g.
+   `tractor.spawn._subint_forkserver._child_target`
+   post-`_close_inherited_fds`) to `/dev/null` or a
+   file.
+
+**Signature tells you it's THIS bug (vs. a real
+code hang):**
+
+- Multi-actor test under fork-based backend
+  (`subint_forkserver`, eventually `trio_proc` too
+  under enough log volume).
+- Multiple `RemoteActorError` / `ExceptionGroup`
+  tracebacks in the error path.
+- Test passes with `-s` in the 5-10s range, hangs
+  past pytest-timeout (usually 30+ s) without `-s`.
+- Subactor processes visible via `pgrep -af
+  subint-forkserv` or similar after the hang —
+  they're alive but blocked on `write()` to an
+  inherited stdout fd.
+
+**Historical reference:** this deadlock cost a
+multi-session investigation (4 genuine cascade
+fixes landed along the way) that only surfaced the
+capture-pipe issue AFTER the deeper fixes let the
+tree actually tear down enough to produce pipe-
+filling log volume. Full post-mortem in
+`ai/conc-anal/subint_forkserver_test_cancellation_leak_issue.md`.
+Lesson codified here so future-me grep-finds the
+workaround before digging.
+
+## 10. Reaping zombie subactors (`tractor-reap`)
+
+**Symptom:** after a `pytest` run crashes, times out,
+or is `Ctrl+C`'d, subactor forks (esp. under
+`subint_forkserver`) can be reparented to `init`
+(PPid==1) and linger. They hold onto ports, inherit
+pytest's capture-pipe fds, and flakify later
+sessions.
+
+**Two layers of defense:**
+
+### a) Session-scoped auto-fixture (always on)
+
+`tractor/_testing/pytest.py::_reap_orphaned_subactors`
+runs at pytest session teardown. It walks `/proc` for
+direct descendants of the pytest pid, SIGINTs them,
+waits up to 3s, then SIGKILLs survivors. SC-polite:
+gives the subactor runtime a chance to run its trio
+cancel shield + IPC teardown before escalation.
+
+This is *autouse* and session-scoped — you don't need
+to do anything. It just runs.
+
+### b) `scripts/tractor-reap` CLI (manual reap)
+
+For the **pytest-died-mid-session** case (Ctrl+C, OOM
+kill, hung process you had to `kill -9`), the fixture
+never ran. Reach for the CLI:
+
+```sh
+# default: orphans (PPid==1, cwd==repo, cmd contains python)
+scripts/tractor-reap
+
+# descendant-mode: from a still-live supervisor
+scripts/tractor-reap --parent <pytest-pid>
+
+# see what would be reaped, don't signal
+scripts/tractor-reap -n
+
+# tune the SIGINT → SIGKILL grace window
+scripts/tractor-reap --grace 5
+```
+
+Exit code: `0` if everyone exited on SIGINT, `1` if
+SIGKILL had to escalate — so you can chain it in CI
+health-checks (`scripts/tractor-reap || <alert>`).
+
+**What it matches** (orphan-mode):
+- `PPid == 1` (reparented to init → definitely
+  orphaned, not just a currently-running child)
+- `cwd == <repo-root>` (keeps the sweep scoped; won't
+  touch unrelated init-children elsewhere)
+- `python` in cmdline
+
+**What it does not do:** kill anything whose PPid is
+still a live tractor parent. If the parent is alive
+it's not an orphan; use `--parent <pid>` if you need
+to force-reap under a still-live supervisor.
+
+**When NOT to run it:** while a pytest session is
+active in another terminal. It's safe (won't touch
+that session's live children in orphan-mode) but can
+race if the target session is mid-teardown.
+
+### c) `--shm` / `--shm-only`: orphan-segment sweep
+
+Because `tractor.ipc._mp_bs.disable_mantracker()`
+turns off `mp.resource_tracker` (see
+`ai/conc-anal/subint_forkserver_mp_shared_memory_issue.md`),
+a hard-crashing actor can leave `/dev/shm/<key>`
+segments behind that nothing else GCs.
+
+```sh
+# process reap THEN shm sweep
+scripts/tractor-reap --shm
+
+# shm sweep only (skip process phase)
+scripts/tractor-reap --shm-only
+
+# dry-run: list candidates, don't unlink
+scripts/tractor-reap --shm -n
+```
+
+**Match criteria** (very conservative — this is a
+shared-system path, can't be wrong):
+- segment is a regular file under `/dev/shm`,
+- owned by the **current uid** (`stat.st_uid`),
+- AND **no live process holds it open** —
+  enumerated by walking every readable
+  `/proc/<pid>/maps` (post-mmap mappings) AND
+  `/proc/<pid>/fd/*` (pre-mmap shm-opened fds).
+
+The "nobody has it open" check is the
+kernel-canonical "is this leaked?" test — same
+answer `lsof /dev/shm/<key>` would give. No
+reliance on tractor-specific naming, so it works
+for any tractor app. Critically, it WILL NOT touch
+segments held by other apps you have running
+(e.g. `piker`, `lttng-ust-*`, `aja-shm-*` —
+verified locally with 81 in-use segments correctly
+preserved).

.github/workflows/ci.yml

@@ -1,10 +1,18 @@
 name: CI
 
+# NOTE distilled from,
+# https://github.com/orgs/community/discussions/26276
 on:
-  # any time someone pushes a new branch to origin
+  # any time a new update to 'main'
   push:
+    branches:
+      - main
 
-  # Allows you to run this workflow manually from the Actions tab
+  # for on all (forked) PRs to repo
+  # NOTE, use a draft PR if you just want CI triggered..
+  pull_request:
+
+  # to run workflow manually from the "Actions" tab
   workflow_dispatch:
 
 jobs:
@@ -29,7 +37,12 @@ jobs:
         run: uv build --sdist --python=3.13
 
       - name: Install sdist from .tar.gz
-        run: python -m pip install dist/*.tar.gz
+        # XXX must install under py3.13 (matching the build's
+        # `--python=3.13`); the runner's default `python` is 3.12
+        # which our `requires-python = ">=3.13"` now rejects.
+        run: |
+          uv venv --python 3.13
+          uv pip install dist/*.tar.gz
 
   # ------ type-check ------
   # mypy:
@@ -74,24 +87,44 @@ jobs:
   #       run: mypy tractor/ --ignore-missing-imports --show-traceback
 
 
-  testing-linux:
-    name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }}'
-    timeout-minutes: 10
+  testing:
+    name: '${{ matrix.os }} Python${{ matrix.python-version }} spawn_backend=${{ matrix.spawn_backend }} tpt_proto=${{ matrix.tpt_proto }}'
+    timeout-minutes: 16
     runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
-        python-version: ['3.13']
+        os: [
+          ubuntu-latest,
+          macos-latest,
+        ]
+        python-version: [
+          '3.13',
+          # '3.14',
+        ]
         spawn_backend: [
           'trio',
           # 'mp_spawn',
           # 'mp_forkserver',
+          # ?TODO^ is it worth it to get these running again?
+          #
+          # - [ ] next-gen backends, on 3.13+
+          #   https://github.com/goodboy/tractor/issues/379
+          # 'subinterpreter',
+          # 'subint',
         ]
+        tpt_proto: [
+          'tcp',
+          'uds',
+        ]
+        # https://github.com/orgs/community/discussions/26253#discussioncomment-3250989
+        exclude:
+          # don't do UDS run on macOS (for now)
+          - os: macos-latest
+            tpt_proto: 'uds'
 
     steps:
-
       - uses: actions/checkout@v4
 
       - name: 'Install uv + py-${{ matrix.python-version }}'
@@ -118,7 +151,14 @@ jobs:
         run: uv tree
 
       - name: Run tests
-        run: uv run pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
+        run: >
+          uv run
+          pytest
+          tests/
+          -rsx
+          --spawn-backend=${{ matrix.spawn_backend }}
+          --tpt-proto=${{ matrix.tpt_proto }}
+          --capture=fd
 
   # XXX legacy NOTE XXX
   #

.github/workflows/docs.yml

@@ -0,0 +1,63 @@
+name: docs
+
+# build sphinx docs on every PR + push to main;
+# deploy to gh-pages only from main pushes.
+# (see goodboy/tractor#123 for the original ask)
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  # to run workflow manually from the "Actions" tab
+  workflow_dispatch:
+
+# needed by actions/deploy-pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    name: 'sphinx build'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install latest uv
+        uses: astral-sh/setup-uv@v6
+
+      # NOTE, no `d2` bin is installed in CI (yet) so
+      # the pre-rendered + committed SVGs under
+      # `docs/_diagrams/` are used as-is; see
+      # `docs/_ext/d2diagrams.py` for the fallback
+      # policy.
+      - name: Build html docs
+        run: |
+          uv sync --no-dev --group docs
+          uv run --no-dev --group docs make -C docs html
+
+      - name: Upload pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/_build/html
+
+  deploy:
+    name: 'deploy to gh-pages'
+    if: ${{ github.ref == 'refs/heads/main' && github.event_name == 'push' }}
+    needs: build
+    # serialize deploys but NEVER cancel an in-flight one
+    # mid-upload; queue the next instead (scoped to this job so
+    # PR builds can't cancel a production deploy).
+    concurrency:
+      group: 'pages'
+      cancel-in-progress: false
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -102,3 +102,69 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+# all files under
+.git/
+
+# require very explicit staging for anything we **really**
+# want put/kept in repo.
+notes_to_self/
+snippets/
+
+# ------- AI shiz -------
+# `ai.skillz` symlinks,
+# (machine-local, deploy via deploy-skill.sh)
+.claude/skills/py-codestyle
+.claude/skills/close-wkt
+.claude/skills/plan-io
+.claude/skills/prompt-io
+.claude/skills/resolve-conflicts
+.claude/skills/inter-skill-review
+
+# /open-wkt specifics
+.claude/skills/open-wkt
+.claude/wkts/
+claude_wkts
+
+# /code-review-changes specifics
+.claude/skills/code-review-changes
+# review-skill ephemeral ctx (per-PR, single-use)
+.claude/review_context.md
+.claude/review_regression.md
+
+# /pr-msg specifics
+.claude/skills/pr-msg/*
+# repo-specific
+!.claude/skills/pr-msg/format-reference.md
+# XXX, so u can nvim-telescope this file.
+# !.claude/skills/pr-msg/pr_msg_LATEST.md
+
+# /commit-msg specifics
+# - any commit-msg gen tmp files
+.claude/*_commit_*.md
+.claude/*_commit*.txt
+.claude/skills/commit-msg/*
+!.claude/skills/commit-msg/style-duie-reference.md
+
+# use prompt-io instead?
+.claude/plans
+
+# nix develop --profile .nixdev
+.nixdev*
+
+# :Obsession .
+Session.vim
+
+# `gish` local `.md`-files
+# TODO? better all around automation!
+# -[ ] it'd be handy to also commit and sync with wtv git service?
+# -[ ] everything should be put under a `.gish/` no?
+gitea/
+gh/
+
+# ------ macOS ------
+# Finder metadata
+**/.DS_Store
+
+# LLM conversations that should remain private
+docs/conversations/

NEWS.rst

@@ -78,6 +78,7 @@ Bug Fixes
   for ``asyncio``-side errors to not propagate due to a race condition.
 
   The implementation fix summary is:
+
   - add state to signal the end of the ``trio`` side task to be
     read by the ``asyncio`` side and always cancel any ongoing
     task in such cases.

ai/conc-anal/fork_thread_semantics_execution_vs_memory.md

@@ -0,0 +1,281 @@
+# `fork()` in a multi-threaded program — execution-side vs. memory-side of the same coin
+
+A reference doc for readers who've encountered one of two
+opposite-sounding framings of POSIX `fork()` semantics in a
+multi-threaded program and are confused by the other.
+
+This is a sibling to
+`subint_fork_blocked_by_cpython_post_fork_issue.md` — that
+doc covers a CPython-level refusal of fork-from-subint;
+this one covers the more general POSIX layer, since
+tractor's main-thread forkserver design rests on it.
+
+## TL;DR
+
+POSIX `fork()` only preserves the *calling* thread as a
+runnable thread in the child — every other thread in the
+parent simply never executes another instruction in the
+child. trio's docs call this "leaked"; tractor's
+`_main_thread_forkserver.py` docstring calls it "gone".
+Both are correct: "gone" is the *execution* side (no
+scheduler entry, no instructions retired), "leaked" is the
+*memory* side (the dead threads' stacks and per-thread
+heap structures still ride into the child's address space
+as orphaned COW pages with no owner and no cleanup hook).
+Same POSIX reality, two halves of the same coin.
+
+## The two framings
+
+[python-trio/trio#1614][trio-1614] (the canonical "trio +
+fork" hazards thread) puts it this way:
+
+> If you use `fork()` in a process with multiple threads,
+> all the other thread stacks are just leaked: there's
+> nothing else you can reasonably do with them.
+
+`tractor.spawn._main_thread_forkserver`'s module docstring
+(specifically the "What survives the fork? — POSIX
+semantics" section) puts it this way:
+
+> POSIX `fork()` only preserves the *calling* thread as a
+> runnable thread in the child. Every other thread in the
+> parent — trio's runner thread, any `to_thread` cache
+> threads, anything else — never executes another
+> instruction post-fork.
+
+A reader bouncing between the two can be forgiven for
+asking: well, *which* is it — leaked or gone?
+
+The answer is "yes". They're describing the same POSIX
+behavior from two different angles:
+
+- trio is talking about the **bytes** the dead threads
+  leave behind — stacks, TLS slots, per-thread arena
+  metadata — and the fact that nothing in the child can
+  drive them forward, free them, or even safely walk
+  them. That's a memory leak in the strict sense: held
+  but unreachable.
+- tractor is talking about the **execution** side
+  relevant to the forkserver design: which threads
+  retire instructions in the child? Exactly one — the
+  one that called `fork()`. Everything else, regardless
+  of the bytes left behind, is dead in a scheduler
+  sense.
+
+Neither framing is wrong; they're just answering
+different questions.
+
+## POSIX `fork()` in a multi-threaded program — what actually happens
+
+Per POSIX (and concretely on Linux glibc), the contract
+of `fork()` in a multi-threaded process is:
+
+1. The kernel creates a new process whose virtual
+   address space is a COW copy of the parent's. *All*
+   pages map across — code, heap, every thread's stack,
+   every malloc arena, every mmap region.
+2. Of the parent's N threads, exactly **one** is
+   reified in the child as a runnable kernel task: the
+   thread that called `fork()`. The other N-1 threads
+   have *no* corresponding task in the child kernel. They
+   were never scheduled, never `clone()`d for the child,
+   never exist as runnable entities.
+3. Their **memory artifacts** — pthread stacks, TLS,
+   `pthread_t` structures, glibc per-thread arena
+   bookkeeping — are still mapped in the child's address
+   space, because (1) duplicates *everything* page-wise.
+   They sit there as inert COW bytes.
+4. The kernel does not clean those bytes up. There is no
+   "phantom-thread cleanup" pass post-fork. The kernel
+   doesn't know which mapped pages "belonged to" which
+   thread — at the kernel level mappings are
+   process-scoped, not thread-scoped.
+5. The surviving thread (the caller of `fork()`) cannot
+   safely access those leaked bytes either. Any state
+   they encoded — held mutexes, in-flight syscalls,
+   half-updated invariants — is frozen at whatever
+   instant the parent's fork-syscall observed it. Some
+   of those mutexes may even still be locked from the
+   child's POV (the canonical "fork-in-multithreaded-
+   program-deadlocks" hazard; see `man pthread_atfork`).
+
+So: from the kernel's PoV, the child has one thread.
+From the address-space's PoV, the child has all the
+parent's bytes — including the corpses of the N-1 dead
+threads' stacks. Both true simultaneously.
+
+## Why trio says "leaked"
+
+trio's framing makes sense from the parent's
+PoV, looking at *what those threads were doing*. In a
+running `trio.run()` process you typically have:
+
+- The trio runner thread itself — owns the `selectors`
+  epoll fd, the signal-wakeup-fd, the run-queue.
+- Threadpool worker threads (`trio.to_thread`'s cache)
+  — blocked in `wait()` on the threadpool's work
+  condvar.
+- Whatever other ad-hoc threads the application
+  started.
+
+Each of those threads owns *real work-state*: epoll
+registrations, file descriptors held in
+soon-to-be-completed reads, half-released locks, posted
+but unconsumed wakeups. After fork, that state is still
+encoded in the child's memory. None of it is invalid in
+a well-formed-bytes sense. It's just that:
+
+- The thread that was driving it is gone.
+- Nothing else in the child knows the layout well
+  enough to take over.
+- Even if it did, the kernel objects backing the work
+  (epoll fd, signalfd) have separate post-fork
+  semantics that don't compose with userland trio
+  state.
+
+So the bytes are *held* (they're in the child's
+address space, they count against RSS, they survive
+until something clobbers them), and they're
+*unreachable* in any meaningful sense — no thread can
+safely drive them forward. That is the textbook
+definition of a leak.
+
+trio's quote is reminding the user that `fork()` from a
+multi-threaded process is a one-way memory hazard:
+whatever those threads were doing, that work-state is
+now garbage you happen to still be carrying.
+
+## Why tractor says "gone"
+
+tractor's `_main_thread_forkserver` framing is concerned
+with a different question: *which thread executes in the
+child, and is it safe?*
+
+The forkserver design rests on POSIX's "calling thread
+is the sole survivor" guarantee. We pick that calling
+thread very deliberately: a dedicated worker that has
+provably never entered trio. So the thread that *does*
+run in the child is one whose locals, TLS, and stack
+contain nothing trio-related. Trio's runner thread —
+the one that owned the epoll fd and the run-queue — is
+*gone* from the child in the execution sense. It will
+never run another instruction. The fact that its stack
+bytes still exist in the child's address space (the
+"leaked" view) is irrelevant to the forkserver, because
+nothing in the child reads or writes those pages.
+
+So when the docstring says "Every other thread … is
+gone the instant `fork()` returns in the child", it's
+being precise about the surface that matters for the
+backend: scheduler-level liveness. Nothing schedules
+those threads ever again. Whether their bytes are
+hanging around is a separate (and, for the design,
+non-load-bearing) fact.
+
+## Cross-table
+
+The same tabular layout the `_main_thread_forkserver`
+docstring uses, expanded with a fourth "what handles
+it" column:
+
+| thread              | parent    | child (executing) | child (memory)               | what handles it             |
+|---------------------|-----------|-------------------|------------------------------|-----------------------------|
+| forkserver worker   | continues | sole survivor     | live stack                   | runs the child's bootstrap  |
+| `trio.run()` thread | continues | not running       | leaked stack (zombie bytes)  | overwritten by child's fresh `trio.run()` |
+| any other thread    | continues | not running       | leaked stack (zombie bytes)  | overwritten / GC'd / clobbered by `exec()` if used |
+
+The "child (executing)" column is the *execution* side
+of the coin — what tractor cares about. The "child
+(memory)" column is the *memory* side — what trio
+cares about.
+
+The "what handles it" column is the deliberate punchline
+of the design: nothing has to handle the leaked bytes
+*explicitly*. They get clobbered by ordinary forward
+progress in the child:
+
+- The fresh `trio.run()` the child boots up allocates
+  its own stack, scheduler, and run-queue, which over
+  time overlaps and overwrites the inherited zombie
+  pages.
+- Python's GC walks live objects only; the dead-thread
+  Python frames aren't reachable from any
+  `PyThreadState`, so they get freed at the next
+  collection cycle.
+- If the child eventually `exec()`s, the entire address
+  space is replaced and the leak vanishes.
+
+## What this means for the forkserver design
+
+The crucial point is that **the design doesn't and
+*can't* prevent the leak**. There is no userland fix
+for COW thread stacks. The kernel hands the child a
+duplicated address space; that's what `fork()` *is*. No
+amount of pre-fork hookery, `pthread_atfork()`
+gymnastics, or post-fork cleanup can un-COW the dead
+threads' pages without unmapping them, and unmapping
+arbitrary regions of a duplicated address space is
+neither portable nor safe.
+
+What the design *does* ensure is the orthogonal
+property: the survivor thread is one that doesn't need
+any of that leaked state to function. Concretely:
+
+- Survivor is the forkserver worker thread.
+- That worker has provably never imported, called into,
+  or held any reference to `trio`. (Enforced by keeping
+  the worker's lifecycle entirely in
+  `_main_thread_forkserver.py` and never letting trio
+  task-state cross into it.)
+- So the leaked pages — trio runner stack, threadpool
+  caches, etc. — are inert relative to the survivor.
+  No code path in the child references them.
+- The child then boots its own fresh `trio.run()`,
+  which allocates new state in new pages. Over the
+  child's lifetime the COW'd zombie pages get
+  overwritten, GC'd, or (if the child eventually
+  `exec()`s) discarded wholesale.
+
+The "leak" is real but inert. It costs RSS until
+clobbered; it doesn't cost correctness. That's exactly
+the property the forkserver pattern is built on, and
+it's also why the design needs the "calling thread is
+trio-free" precondition to be airtight: if the survivor
+were a trio thread, it *would* try to drive the leaked
+trio state, and the leak would no longer be inert.
+
+## See also
+
+- `tractor/spawn/_main_thread_forkserver.py` — module
+  docstring's "What survives the fork? — POSIX
+  semantics" section is the in-tree, code-adjacent
+  prose this doc expands on. The cross-table here is a
+  fourth-column expansion of the table there.
+
+- [python-trio/trio#1614][trio-1614] — the trio issue
+  with the "leaked" framing, and the canonical thread
+  for trio + `fork()` hazards more broadly.
+
+- [`subint_fork_blocked_by_cpython_post_fork_issue.md`](./subint_fork_blocked_by_cpython_post_fork_issue.md)
+  — sibling analysis covering CPython's *post-fork*
+  hooks (`PyOS_AfterFork_Child`,
+  `_PyInterpreterState_DeleteExceptMain`) and why
+  fork-from-non-main-subint is a CPython-level hard
+  refusal. Complementary axis: this doc is about POSIX
+  semantics; that doc is about the CPython runtime
+  layer that runs *after* POSIX `fork()` returns in
+  the child.
+
+- `man pthread_atfork(3)` — canonical "fork in a
+  multithreaded process is dangerous" reference.
+  Especially the rationale section, which is the
+  closest thing to a normative statement of "the
+  surviving thread cannot safely use anything the dead
+  threads were touching."
+
+- `man fork(2)` (Linux) — "Other than [the calling
+  thread], … no other threads are replicated …"
+  paragraph is the kernel-side statement of the
+  execution-side framing this doc opens with.
+
+[trio-1614]: https://github.com/python-trio/trio/issues/1614

ai/conc-anal/ria_nursery_removal_plan.md

@@ -0,0 +1,460 @@
+# `_ria_nursery` removal plan (issue #477 follow-up)
+
+Goal: drop the secondary "run-in-actor" spawn nursery (and
+friends) from `ActorNursery`/spawn internals, now that
+`tractor.to_actor.run()` delivers one-shot semantics purely on
+the daemon-spawn + portal primitives.
+
+## Verified machinery map (2026-07-02, wkt @ a34aaf98)
+
+The entire mechanism is 4 files:
+
+- `runtime/_supervise.py`
+  - `ActorNursery.__init__(.., ria_nursery, ..)` stores
+    `._ria_nursery` (:202, :238); sole read is
+    `run_in_actor()` passing `nursery=self._ria_nursery`
+    (:442) into `start_actor()`'s `nursery:
+    trio.Nursery|None` escape-hatch param (:305, :367).
+  - `._cancel_after_result_on_exit: set` (:244) marks ria
+    portals (:457).
+  - `_open_and_supervise_one_cancels_all_nursery()` nests
+    `da_nursery` (:609) around `ria_nursery` (:622); the
+    `finally:` at the ria->da boundary (:747-766) raises
+    collected `errors` (single exc or BEG).
+- `runtime/_portal.py`
+  - `._expect_result_ctx` (:112) set by `_submit_for_result()`
+    (:142, sole caller `run_in_actor()`); consumed by
+    `wait_for_result()` (:167) + deprecated `result()` (:220).
+    The `None` branch (:184-196) returns the `NoResult`
+    sentinel (`_exceptions.py:1164`).
+- `spawn/_spawn.py`
+  - `exhaust_portal()` (:129): awaits
+    `portal.wait_for_result()`, CATCHES+RETURNS any exc
+    (never raises).
+  - `cancel_on_completion()` (:177): `exhaust_portal()` ->
+    on exc-result stash `errors[uid] = result` (:203) ->
+    ALWAYS `portal.cancel_actor()` (:218).
+- `spawn/_trio.py` (:195-222) + `spawn/_mp.py` (:187-213),
+  identical shape: after shielded
+  `await an._join_procs.wait()`, open a per-child local
+  nursery; IFF `portal in an._cancel_after_result_on_exit`
+  start `cancel_on_completion` alongside `soft_kill()`; when
+  `soft_kill` returns first, `nursery.cancel_scope.cancel()`
+  reaps the result-waiter.
+
+## The load-bearing semantic (already-deferred errors)
+
+Remote ria-child errors NEVER raise into `ria_nursery`:
+
+1. reaper tasks only START after `_join_procs.set()` (block
+   exit or the inner error handler),
+2. `exhaust_portal` swallows the exc into a return value,
+3. `cancel_on_completion` stashes it in `errors` + cancels
+   that child,
+4. the ria->da `finally:` re-raises collected `errors` (and
+   `an.cancel()`s any daemon stragglers).
+
+So mid-block there is NO error propagation from ria children
+(unless user code explicitly `await portal.wait_for_result()`s)
+— the two-nursery nesting only sequences "reap ria results
+BEFORE blocking on daemon join". A single-nursery impl only
+needs to preserve that sequencing, not any ASAP-cancel
+behavior.
+
+## Target design
+
+### step A: single-nursery `run_in_actor()` (mechanical)
+
+- `run_in_actor()` spawns via the DEFAULT (`_da_nursery`)
+  path — drop `nursery=self._ria_nursery`.
+- rename `._cancel_after_result_on_exit` ->
+  `._ria_portals: dict[portal, Actor]` (need the subactor ref
+  for `cancel_on_completion`).
+- move reaper start-up OUT of the backends into
+  `_open_and_supervise...`: immediately after EACH
+  `an._join_procs.set()` call-site (happy path :642, inner
+  error handler :661), start one
+  `cancel_on_completion(portal, subactor, errors)` task per
+  ria portal into `da_nursery`, then (happy path only)
+  `await` their completion BEFORE falling out of the
+  `try:`/`finally:` that raises `errors` — e.g. gather in a
+  dedicated inner `trio.open_nursery()` block replacing
+  today's `ria_nursery` join point.
+- delete the membership branch + local reaper nursery from
+  `_trio.py`/`_mp.py` (keep the `soft_kill()` call; the
+  per-child local nursery collapses to just `soft_kill`).
+- `_trio.py:310` `_children.pop()` etc. unchanged.
+
+### step B: delete the plumbing
+
+- `_open_and_supervise...`: drop the inner
+  `ria_nursery` + merge its `except BaseException` classify
+  logic into ONE handler on the (now single) nursery scope;
+  `ActorNursery.__init__` loses the `ria_nursery` param.
+- `start_actor()` loses the `nursery:` escape-hatch param
+  (the :302-304 TODO).
+- backends: no more `_cancel_after_result_on_exit` refs.
+
+### step C: (separate PRs) deprecate + migrate + excise
+
+- migrate in-repo `.run_in_actor()` usage to
+  `to_actor.run()`: tests 46 hits/9 files (test_cancellation
+  15, test_infected_asyncio 10, test_spawning 8, registrar 3,
+  adv_streaming 4, pubsub 2, rpc 1, runtime 1), examples 28
+  hits/13 files (debugging/* dominate), docs 20 hits/8 rst
+  files. NOTE: many sites also use deprecated
+  `Portal.result()`/`wait_for_result()` — these die with
+  `_expect_result_ctx`, so migration must land FIRST.
+- add `DeprecationWarning` to `run_in_actor()` (+
+  `_submit_for_result`/`wait_for_result`).
+- final excision: `run_in_actor()`, `_submit_for_result`,
+  `_expect_result_ctx`, `wait_for_result`/`result`,
+  `exhaust_portal`, `cancel_on_completion`, `NoResult`.
+
+## Risk register
+
+1. hard-killed ria child: today the backend-local
+   `nursery.cancel_scope.cancel()` discards a still-parked
+   reaper when the proc dies first; a da_nursery-hosted
+   reaper instead sees the transport break ->
+   `exhaust_portal` returns a `TransportClosed`-ish exc ->
+   NEW entry in `errors` that today gets discarded. Guard:
+   reap-gather block must cancel remaining reapers once all
+   ria procs are dead, or filter transport-death excs for
+   already-`cancel_called` children.
+2. error-path ordering: inner handler today sets
+   `_join_procs` THEN `an.cancel()`; reapers race the
+   cancel-RPC. Keep that ordering when moving reaper spawn.
+3. debugger interplay: `maybe_wait_for_debugger()` calls
+   (:654, :730) must stay BEFORE any reap/cancel issuance.
+4. `errors` double-entry: local body error (:646) + child's
+   relayed exc (via reaper) can both land for the same
+   scenario -> BEG shape changes vs today? (today has the
+   same dual-write sites; keep behavior identical.)
+5. mp backend parity: mirror every `_trio.py` edit in
+   `_mp.py` (identical block).
+
+## Step-A first-probe findings (2026-07-02, WIP in tree)
+
+Step A is IMPLEMENTED (uncommitted):
+`run_in_actor()` spawns via da_nursery; new
+`_supervise._reap_ria_portals()` helper; reap awaited after
+happy-path `_join_procs.set()`; error-path runs reap
+CONCURRENT with `an.cancel()` in the shielded block;
+backends stripped of the membership branch + per-child
+reaper nursery (+ dead imports).
+
+Probe history (trio backend):
+- `tests/test_to_actor.py` + `tests/test_spawning.py`:
+  20/20 PASS — incl. all `run_in_actor()` result
+  round-trips + `test_remote_error` (single erroring child,
+  body re-raise -> inner error path).
+- FIRST attempt ran the error-path reap CONCURRENT with
+  `an.cancel()` (mimicking the old backend-side race):
+  `test_cancellation.py::test_multierror` (2 erroring ria
+  children, body re-raises one) DEADLOCKED. Root cause per
+  the sequencing fix below: reap + cancel must NOT race at
+  this layer (suspected `._children` pop-during-iteration
+  and/or double-cancel RPC wedge; not fully root-caused
+  since the fix removes the race wholesale).
+- FIX (2nd attempt, current impl): error path SEQUENCES:
+  (1) snapshot ria `(portal, subactor)` pairs (backend
+  `finally`s pop `._children` as procs reap), (2)
+  `await an.cancel()`, (3) bounded reap over the snapshot.
+  Bound was first 3s -> blew the `fail_after` deadline in
+  `test_cancel_while_childs_child_in_sync_sleep` (hard-
+  killed grandchild never relays => reaper parks the full
+  bound). Tightened to 0.5s: anything collectable is
+  already queued in the local ctx (relayed BEFORE the
+  cancel); a parked reaper self-cleans (`trio.Cancelled`
+  results are never stashed).
+- RESULT: `tests/test_cancellation.py` FULLY GREEN
+  (20 passed, 1 xfailed, 77s); full-suite gate run kicked
+  off same session (see final report/next session).
+
+Remaining risk: on slow CI a relayed-but-undelivered error
+racing the 0.5s bound could drop an `errors` entry
+(BEG-shape flake); if observed, scale the bound via the
+`cpu_perf_headroom()`-style approach or peek
+`Portal._final_result_msg`/ctx queue state instead of
+time-bounding.
+
+## Step-B outcome (2026-07-02, done in tree)
+
+Step A landed as `5cd190c5` (code) + `99310269` (docs).
+Step B implemented on top (uncommitted):
+
+- `._ria_nursery` is GONE — the inner
+  `async with (collapse_eg(), trio.open_nursery() as
+  ria_nursery)` layer in
+  `_open_and_supervise_one_cancels_all_nursery` is deleted;
+  `da_nursery` is now the single nursery for ALL subactors.
+- `ActorNursery.__init__` drops the `ria_nursery` param +
+  the `self._ria_nursery` attr; `start_actor()` drops its
+  `nursery=` escape-hatch param (uses `self._da_nursery`
+  directly).
+- `._cancel_after_result_on_exit` STAYS — it's the
+  ria-child discriminator for `_reap_ria_portals()`.
+
+Deliberately NOT done (deferred to its own higher-risk PR,
+flagged with a TODO at the outer `except`): merging the two
+error handlers into one. Rationale — collapsing the empty
+nursery is provably behavior-preserving (a zero-task
+`trio.open_nursery()` only adds a checkpoint), whereas the
+inner `except BaseException` (swallow-into-`errors`) and
+outer `except (...)` (re-raise, safety-net for the inner
+handler's own non-shielded awaits) have DIFFERENT
+semantics; merging changes error/cancel propagation and
+wants isolated review + its own gate. Both handlers are
+kept, now nested directly under the single nursery.
+
+Why the collapse is safe: post-step-A NOTHING spawns into
+`ria_nursery` (its only reader, `run_in_actor`'s
+`nursery=self._ria_nursery`, was removed in A; the stored
+attr was never read again). So the layer was pure dead
+weight.
+
+Gate (trio backend, all 0-failure):
+- targeted set (`test_cancellation test_spawning test_local
+  test_rpc test_to_actor`) = 49 passed, 1 xfailed.
+- tail set (`test_reg_err_types remote_exc_relay
+  resource_cache ringbuf root_infect_asyncio root_runtime
+  runtime shm task_broadcasting trioisms trionics/`) = 63
+  passed, 1 skipped, 5 xfailed.
+- full-suite head ~73% (subdirs + `test_2way`..`test_pubsub`)
+  = 303 passed before the known-flaky `test_dynamic_pub_sub`
+  TooSlowError stall (pre-existing; same hang in the step-A
+  full run). Suite ran slow this session (~13min vs 555s
+  cold, likely thermal from back-to-back runs), never
+  completing within an 800s bound — but split across the
+  above three runs EVERY module passed under step B.
+
+## Step-B2 outcome (2026-07-02, done in tree)
+
+Step B committed as `9201a2ed` (code) + `d2e812fb` (docs), then
+branched to `drop_ria_nursery`. Step B2 (the deferred
+handler-merge) implemented on top (uncommitted):
+
+- the two nested handlers in
+  `_open_and_supervise_one_cancels_all_nursery` collapse to
+  ONE `except BaseException as _scope_err` + the existing
+  `finally`. The `outer_err`/`inner_err` locals go away.
+
+Why it's safe (trace, not hope): the OLD inner handler records
+`errors[actor.aid.uid]` as its FIRST statement (before any
+await). So whenever an error path runs, `errors` is non-empty.
+The OLD outer handler was only reachable via leakage from the
+inner handler (it catches `BaseException`, so nothing from the
+`yield` scope bypasses it) — and by then `errors` is already
+populated, so the `finally`'s `raise` from `errors` ALWAYS
+superseded the outer handler's own `raise`. i.e. the outer
+`raise` was dead. The outer handler's other effects
+(`_scope_error`, a 2nd debugger-wait, child-cancel) are
+redundant with the merged handler + `finally`. So one handler
++ `finally` is observably equivalent.
+
+Residual nuance (accepted): in the rare "`trio.Cancelled`
+delivered during the non-shielded `maybe_wait_for_debugger`"
+path, the merged form may leave `_cancel_called` False (cancel
+happens after the wait), so `open_nursery`'s tb-hiding guard
+(`not cancel_called and _scope_error`) can show a tb it
+previously hid. More informative, not less; no test asserts on
+it.
+
+Gate (box ran ~2.7x slow this session, load-induced
+`TooSlowError` flakiness on timing tests — NOT code; see
+[[env_cpu_throttle_masquerades_as_regression]]):
+- baseline (pre-B2 tip `9201a2ed`) full suite
+  (`-k 'not dynamic_pub_sub'`) = 300 passed + 1
+  `test_ext_types_over_ipc` `TooSlowError` that passes 6/6 in
+  isolation (4.89s).
+- B2 error/cancel gate (`test_cancellation remote_exc_relay
+  inter_peer_cancellation advanced_faults oob_cancellation
+  to_actor spawning local rpc`) = 71 passed, 1 xfailed
+  (125s).
+- B2 full-suite run: see `b2_full.log` (result appended on
+  completion). RECOMMEND a clean full-suite run on a
+  normal-speed box before this merges.
+
+## Regression + fix: ria-reap hang (2026-07-02)
+
+Human hit a full-suite hang on
+`test_infected_asyncio.py::test_tractor_cancels_aio`. Bisected:
+passes at pre-ria `a34aaf98` (0.59s), hangs at B2 `e617b498`
+(90s+). Root-caused to the STEP-A reaper hoist (`5cd190c5`),
+NOT B2 (`_reap_ria_portals` is byte-identical A->B2).
+
+Bug: the test does `run_in_actor(asyncio_actor)` then a USER
+`portal.cancel_actor()` and exits the block cleanly -> the
+happy path's `await _reap_ria_portals()`, which waits UNBOUNDED
+on `cancel_on_completion -> wait_for_result()`. The child was
+cancelled out-of-band so no final result is relayed -> parked
+forever. The OLD spawn-backend reaper was raced against
+`soft_kill()` (per-child nursery `cancel_scope.cancel()` on
+subproc death); the hoist dropped that race.
+
+Fix: `_reap_ria_portals()` runs each `cancel_on_completion()`
+in a local nursery alongside a `proc.poll()` death-watch that
+cancels the parked reaper once the subproc exits — restoring
+the old race, backend-agnostic (guarded by
+`hasattr(proc, 'poll')` for a future `subint` handle).
+
+Why POLL (`proc.poll()`) not the event-driven `wait_func`:
+the mp waiter (`_spawn.proc_waiter`) does
+`wait_readable(proc.sentinel)`, and `soft_kill()` is ALREADY
+awaiting that same fd concurrently in the daemon nursery — a
+2nd `wait_readable` on one fd raises `trio.BusyResourceError`.
+(`trio.Process.wait()` IS multi-waiter-safe, but mp has no
+async equivalent.) `proc.poll()` — the same liveness check
+`soft_kill` itself falls back to — is the conflict-free common
+denominator. Verified: poll-fix passes on BOTH trio and
+mp_spawn.
+
+Also added a per-test anti-hang guard: wrapped
+`test_tractor_cancels_aio`'s `main()` in
+`with trio.fail_after(9 * cpu_perf_headroom())` — the blessed
+pattern (`pytest-timeout`'s global cap is intentionally off;
+breaks trio under fork backends, see `pyproject` NOTE). So a
+future recurrence FAILS FAST instead of hanging the suite.
+(Several other tests in the file are still guardless —
+`test_aio_simple_error`, `test_trio_error_cancels_intertask_chan`,
+`test_aio_errors_and_channel_propagates_and_closes` — candidate
+follow-up sweep.)
+
+Lesson: the B2 focused gate OMITTED `test_infected_asyncio`
+(and the full runs were clipped/slow), so the step-A hang
+slipped through. Any future ria-touching change MUST gate
+`test_infected_asyncio` explicitly.
+
+Gate: `test_tractor_cancels_aio` green (trio 1.53s, mp 3.98s);
+fix gate (`test_infected_asyncio test_cancellation test_to_actor
+test_spawning`) = 74 passed, 3 xfailed, 0 failures.
+
+## PAUSED (2026-07-02): re-assess the reaper's SCOPE
+
+User's insight (compelling — likely the real root cause of
+the hang, not just the missing proc-death race):
+
+> the "hoisting" of 5cd190c5 was just not really done right
+> — the hoist should have been into the `to_actor` scope,
+> not `_supervise`.
+
+The argument: `.run_in_actor()`'s result-waiting/reaping got
+hoisted into `_supervise._reap_ria_portals` (nursery-machinery
+scope), which has NO natural cancel-scope to bound a parked
+`wait_for_result()` — hence the awkward proc-death race +
+the poll-vs-`proc_waiter` dilemma. If the result-wait instead
+lived in the `to_actor` one-shot scope
+(`to_actor._invoke_in_subactor()`), it would sit right next to
+the caller's `an` + a local `trio` task-nursery + cancel-scope
+(the `trio.to_thread`-style model #477 actually wants) — so
+bounding/cancelling the wait is trivial and the hang
+dissolves from correct scoping rather than a bolt-on race.
+
+Follow-on to re-evaluate on resume:
+- should `_reap_ria_portals` exist AT ALL, or should
+  result-waiting move entirely into
+  `to_actor._invoke_in_subactor()`?
+- reimplement legacy `run_in_actor()` on top of
+  `to_actor.run()` so `_reap_ria_portals` +
+  `_cancel_after_result_on_exit` can be DROPPED from
+  `_supervise` entirely (the true #477 simplification)?
+- the poll-vs-event decision is MOOT under this re-scoping.
+
+State at pause: `test_infected_asyncio` anti-hang guard
+COMMITTED (`d1fb4a1a`, intentionally red w/o the fix — the
+user's failing-test-first convention). The poll-based reap
+fix in `_supervise.py` is UNCOMMITTED and likely SUPERSEDED
+by the re-scoping — do NOT land it as-is.
+
+## RESOLVED (2026-07-06): migrate everything, remove the API
+
+The PAUSED re-assessment concluded decisively: rather than
+re-scope `_reap_ria_portals` (or bolt any hack onto it), the
+`run_in_actor()` API itself was REMOVED — its non-blocking
+"result at teardown" semantic predates streaming and confused
+more than it served. Every in-repo caller was migrated
+per-file/-group (each its own commit, each gated):
+
+- tests: `test_infected_asyncio` `test_runtime` `test_rpc`
+  `test_spawning` `test_pubsub` `test_registrar`
+  `test_cancellation` (3 groups) `test_advanced_streaming`.
+- examples: 4 non-debugging + all 8 `debugging/` REPL scripts
+  (debugger suite byte-identical green, 28p/6s).
+- docs: 8 rst pages + the `experimental/_pubsub` docstring.
+
+Migration patterns (the `run_in_actor` shape -> successor):
+
+- blocking result        -> `to_actor.run(fn, an=an, ...)`
+- fire-&-forget/forever  -> bg `to_actor.run()` task in a local
+                            `trio` task-nursery (or `start_actor`
+                            + bg `Portal.run()` when a portal
+                            handle is needed)
+- concurrent fan-out     -> N bg `to_actor.run()` tasks / or
+                            `gather_contexts([p.open_context(..)])`
+- reap-all-error-collect -> the "collect don't cancel" pattern:
+                            each one-shot catches + stashes its
+                            `RemoteActorError`, group raised
+                            after the task-nursery joins (see
+                            `examples/debugging/multi_subactors.py`)
+- mutual-rendezvous      -> peers must OUTLIVE both dialogs:
+                            `start_actor()` daemons + concurrent
+                            `Portal.run()`s + explicit
+                            `an.cancel()` (eager one-shot reap
+                            races the slower peer's dial of the
+                            winner's dead sockaddr; found via
+                            `test_trynamic_trio` flake).
+
+Semantic deltas (tests loosened accordingly):
+
+- teardown-reap-all BEG-of-N is GONE: local task-nurseries are
+  cancel-on-first, raced siblings' `Cancelled`s are absorbed,
+  and the runtime's `collapse_eg()` unwraps every single-member
+  group at each actor boundary — a fully-raced nested tree
+  relays a bare (annotated) `RemoteActorError` chain.
+- `test_multierror_fast_nursery` deleted (pure reap-stress);
+  `test_nested_multierrors` re-purposed as deep-tree
+  cancel-cascade stress w/ a race-tolerant shape walk.
+
+Final excision (after zero callers remained): `run_in_actor()`,
+`._cancel_after_result_on_exit`, `_reap_ria_portals()`,
+`Portal._submit_for_result/._expect_result_ctx/
+.wait_for_result()/.result()`, `exhaust_portal()`,
+`cancel_on_completion()`, `NoResult` — net -402 lines. The
+reap-hang class (unbounded `wait_for_result` in machinery
+scope) dissolves structurally: the only result-wait left lives
+in the caller's task inside its own cancel-scope; the
+`d1fb4a1a` anti-hang guard test passes by construction. The
+poll-vs-`proc_waiter` debate is moot as predicted.
+
+## Follow-up sketch: `to_actor.open_one_shot()` (run-async parity)
+
+If deferred-result parity is ever wanted, the design that needs
+NO runtime coupling, NO returned `Portal` and NO cancel-relay
+`trio.Event` machinery:
+
+    async with to_actor.open_one_shot(
+        fn, an=an, **kws,
+    ) as one_shot:
+        ...                       # concurrent caller work
+        val = await one_shot.wait()   # optional; errors always
+                                      # propagate at scope exit
+
+an `@acm` that opens a private task-nursery, `start_soon`s ONE
+task running the existing blocking `run()` and stashes the
+value in a slot + sets a done-`trio.Event` (a memo, not a
+cancel relay). Cancellation = plain scope-cancel of the acm's
+nursery (the parked `Portal.run()` unwinds via `Cancelled`, the
+shielded `cancel_actor()` reap still runs); a child error
+raises into the acm scope so an un-`wait()`ed one-shot can
+never silently drop its error. i.e. the old reaper's job is
+done by scoping, not machinery. ~40 lines, all in
+`to_actor/_api.py`, zero `_supervise` involvement.
+
+## Verification gate
+
+- per-migration-commit module gates on `trio` (+ `mp_spawn`
+  spot-gates incl. `test_infected_asyncio` per the B2 lesson);
+  `tests/devx/test_debugger.py` for the REPL flows.
+- full suite on `trio` + `mp_spawn` at branch tip + CI matrix
+  via draft PR #484.

ai/conc-anal/spawn_time_boot_death_dup_name_issue.md

@@ -0,0 +1,142 @@
+# Spawn-time boot-death (`rc=2`) under rapid same-name spawn against a registrar
+
+## Symptom
+
+Spawning N (≥4) sub-actors with the **same name** in tight
+succession against a daemon registrar surfaces as
+`ActorFailure: Sub-actor (...) died during boot (rc=2)
+before completing parent-handshake`.
+
+```
+tests/discovery/test_multi_program.py
+  ::test_dup_name_cancel_cascade_escalates_to_hard_kill[n_dups=4]
+```
+
+```
+tractor._exceptions.ActorFailure:
+  Sub-actor ('doggy', '<uuid>') died during boot (rc=2)
+  before completing parent-handshake.
+    proc: <_ForkedProc pid=<n> returncode=None>
+```
+
+The `proc` repr shows `returncode=None` because the repr is
+captured before `proc.wait()` returns; the actual
+`os.WEXITSTATUS == 2` is reported via `result['died']` in the
+race-helper.
+
+## When it surfaces
+
+- N=2 (`n_dups=2`): **always passes**.
+- N=4 (`n_dups=4`): **consistent fail** under both `tpt-proto=tcp`
+  and `tpt-proto=uds`, MTF backend.
+- N=8 (`n_dups=8`): **passes** (counter-intuitive — see "racing
+  windows").
+- Non-MTF backends: not yet exercised systematically.
+
+## What previously masked it
+
+Pre the spawn-time `wait_for_peer_or_proc_death` race-helper
+(in `tractor.spawn._spawn`), the parent's `start_actor` flow
+ended with a bare:
+
+```python
+event, chan = await ipc_server.wait_for_peer(uid)
+```
+
+That awaits an unsignalled `trio.Event` on `_peer_connected[uid]`.
+If the sub-actor process **dies during boot** (before its
+runtime executes the parent-callback handshake that sets the
+event), the wait parks forever. The dead proc becomes a zombie
+because no one ever calls `proc.wait()` to reap it.
+
+In test contexts the failure presented as a hang or a much
+later `trio.TooSlowError` from an outer `fail_after`. In
+production it'd present as a parent that never makes progress
+past `start_actor`. The death itself was silently masked.
+
+## What surfaces it now
+
+`tractor.spawn._spawn.wait_for_peer_or_proc_death` (used by
+`_main_thread_forkserver_proc`) races the handshake-wait
+against `proc.wait()`. The race-helper raises `ActorFailure`
+on death-first instead of parking, exposing the rc=2.
+
+## Hypothesis: registrar-side same-name contention
+
+The test spawns N actors with name `doggy` sequentially:
+
+```python
+for i in range(n_dups):
+    p: Portal = await an.start_actor('doggy')
+    portals.append(p)
+```
+
+Each spawned doggy:
+
+1. Forks via the forkserver.
+2. Boots its runtime in `_actor_child_main`.
+3. Connects back to the parent for handshake.
+4. Connects to the daemon registrar to call `register_actor`.
+5. Enters its RPC msg-loop.
+
+Step (4) is where the same-name contention lives. The
+registrar's `register_actor` (in
+`tractor.discovery._registry`) accepts duplicate names
+(stores `(name, uuid) -> addr`), but its internal bookkeeping
+may have a non-trivial check (e.g. `wait_for_actor` resolution,
+`_addrs2aids` map updates) that errors out under specific
+ordering between the existing entry and the incoming one.
+
+`rc=2 == os.WEXITSTATUS == 2` corresponds to `sys.exit(2)`
+in the doggy process — typically reached via an unhandled
+exception that's translated to exit code 2 by Python's top-
+level (e.g. `argparse` errors use 2; `SystemExit(2)` etc.).
+So the doggy is hitting an explicit exit path during
+`register_actor` or just-after.
+
+The non-monotonic shape (N=2 OK, N=4 BAD, N=8 OK) suggests a
+specific timing window — likely "the 3rd register-RPC arrives
+while the 1st-or-2nd is in some intermediate state". With
+N=8, the additional procs widen the registration spread
+enough that no two land in the conflicting window.
+
+## Where to dig next
+
+- Add per-actor logging in `_actor_child_main` and
+  `register_actor` to surface the actual exception that
+  triggers the rc=2 exit. Currently the doggy dies before
+  the parent ever sees its stderr (forkserver doesn't
+  marshal child stdio back).
+- Race-test the registrar's `register_actor` /
+  `unregister_actor` /  `wait_for_actor` against same-name
+  concurrent calls in isolation (no spawn).
+- Consider whether `register_actor` should be idempotent
+  under same-name re-register or should explicitly reject
+  same-name (and ideally with a clear `RemoteActorError`,
+  not `sys.exit(2)`).
+
+## Test-suite handling
+
+Currently:
+
+- `tests/discovery/test_multi_program.py
+  ::test_dup_name_cancel_cascade_escalates_to_hard_kill[n_dups=4]`
+  is `pytest.mark.xfail(strict=False, reason=...)` to keep
+  the suite green while this issue is investigated.
+- `n_dups=2` and `n_dups=8` continue to validate the
+  cancel-cascade hard-kill escalation.
+
+Once the underlying race is understood + fixed, drop the
+xfail.
+
+## Related work
+
+- The cancel-cascade fix that introduced this regression
+  test:
+  `tractor/_exceptions.py:ActorTooSlowError`,
+  `tractor/runtime/_supervise.py:_try_cancel_then_kill`,
+  `tractor/runtime/_portal.py:Portal.cancel_actor(
+   raise_on_timeout=...)`.
+- The spawn-time death-detection that exposed this:
+  `tractor/spawn/_spawn.py:wait_for_peer_or_proc_death`,
+  used by `tractor/spawn/_main_thread_forkserver.py`.

ai/conc-anal/test_register_duplicate_name_daemon_connect_race_issue.md

@@ -0,0 +1,273 @@
+# `test_register_duplicate_name` racy connect-failure on `daemon` fixture readiness
+
+## Symptom
+
+`tests/test_multi_program.py::test_register_duplicate_name`
+fails intermittently under BOTH transports + ALL spawn
+backends with connect-refused errors:
+
+```
+# under --tpt-proto=uds
+FAILED tests/test_multi_program.py::test_register_duplicate_name
+- ConnectionRefusedError: [Errno 111] Connection refused
+( ^^^ this exc was collapsed from a group ^^^ )
+
+# under --tpt-proto=tcp
+FAILED tests/test_multi_program.py::test_register_duplicate_name
+- OSError: all attempts to connect to 127.0.0.1:36003 failed
+( ^^^ this exc was collapsed from a group ^^^ )
+```
+
+Distinct from the cancel-cascade `TooSlowError` flake
+class — see
+`cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`.
+This is a **connect-time race** before the daemon is
+fully ready to `accept()`, not a teardown-cascade
+slowness.
+
+## Root cause: blind `time.sleep()` in `daemon` fixture
+
+`tests/conftest.py::daemon` boots a sub-py-process via
+`subprocess.Popen([python, '-c', 'tractor.run_daemon(...)'])`,
+then **blindly sleeps** a fixed delay before yielding
+`proc` to the test:
+
+```python
+# excerpt from tests/conftest.py::daemon
+proc = subprocess.Popen([
+    sys.executable, '-c', code,
+])
+
+bg_daemon_spawn_delay: float = _PROC_SPAWN_WAIT  # 0.6
+if tpt_proto == 'uds':
+    bg_daemon_spawn_delay += 1.6
+if _non_linux and ci_env:
+    bg_daemon_spawn_delay += 1
+
+# XXX, allow time for the sub-py-proc to boot up.
+# !TODO, see ping-polling ideas above!
+time.sleep(bg_daemon_spawn_delay)
+
+assert not proc.returncode
+yield proc
+```
+
+Inherent fragility: the delay is "long enough on dev
+boxes most of the time" but has no actual
+synchronization with the daemon's `bind()` + `listen()`
+completion. Under any of:
+
+- Loaded box (CI parallelism, big rebuild in
+  background, low-cpu-freq)
+- Cold first-run (`importlib` cache miss, JIT warmup)
+- Higher-than-expected `tractor` import cost
+- Filesystem latency (UDS sockfile create, slow
+  tmpfs)
+
+...the sleep finishes BEFORE the daemon has bound its
+listen socket → first test client call to
+`tractor.find_actor()` / `wait_for_actor()` /
+`open_nursery(registry_addrs=[reg_addr])`'s implicit
+connect → `ConnectionRefusedError` (TCP) or
+`FileNotFoundError`/`ConnectionRefusedError` (UDS).
+
+## Reproducer
+
+Easiest: run the suite under load.
+
+```bash
+# create CPU pressure on another core in parallel
+stress-ng --cpu 2 --timeout 600s &
+
+./py313/bin/python -m pytest \
+  tests/test_multi_program.py::test_register_duplicate_name \
+  --spawn-backend=main_thread_forkserver \
+  --tpt-proto=tcp -v
+```
+
+Reproduces ~30-50% of the time on a dev laptop. On a
+quiet idle box, may need 5-10 runs to hit.
+
+## Why the existing `_PROC_SPAWN_WAIT` tuning is
+inadequate
+
+Recent `bg_daemon_spawn_delay` rename
+(de-monotonic-grow fix) just-shipped removed the
+*accumulation* bug where each invocation made the
+NEXT test's wait longer too. Net effect: every
+invocation now uses the SAME `0.6 + 1.6` (UDS) or
+`0.6` (TCP) sleep, no growth. Good — but does
+NOTHING for the underlying race. Each individual
+test still relies on a blind sleep that may or may
+not be sufficient.
+
+Bumping the constant higher pushes flake rate down
+but never to zero AND adds dead time to every
+non-flaking run. Not a fix, just a knob.
+
+## Side effects
+
+- **Inter-test cascade**: a single failure can cascade
+  via leaked subprocesses (the `daemon` fixture's
+  cleanup may not fully tear down a daemon that never
+  reached "ready"). The `_reap_orphaned_subactors`
+  session-end + `_track_orphaned_uds_per_test`
+  per-test fixtures handle most of this now, but the
+  affected test itself still fails.
+- **Worsens under fork-spawn backends**: the daemon
+  has more init work
+  (`_main_thread_forkserver`-coordinator-thread
+  startup, etc.) so the sleep has to cover MORE.
+
+## Fix design — replace blind sleep with active poll
+
+The right primitive is **poll the daemon's bind
+address until it accepts a connection or we time
+out**, with the timeout being a hard ceiling rather
+than a baseline. Two implementation paths:
+
+### Path A — TCP/UDS connect-poll loop
+
+Try `socket.connect(reg_addr)` in a tight loop with
+short backoff (~50ms), succeed on the first non-error
+return, fail-loud on a hard cap (e.g. 10s). Same
+primitive works for both transports because both use
+`socket.connect()` semantics.
+
+Rough shape:
+
+```python
+def _wait_for_daemon_ready(
+    reg_addr,
+    tpt_proto: str,
+    timeout: float = 10.0,
+    poll_interval: float = 0.05,
+) -> None:
+    deadline = time.monotonic() + timeout
+    while True:
+        if tpt_proto == 'tcp':
+            sock = socket.socket(socket.AF_INET)
+            target = reg_addr  # (host, port)
+        else:  # uds
+            sock = socket.socket(socket.AF_UNIX)
+            target = os.path.join(*reg_addr)
+        try:
+            sock.settimeout(poll_interval)
+            sock.connect(target)
+        except (
+            ConnectionRefusedError,
+            FileNotFoundError,
+            socket.timeout,
+        ) as exc:
+            if time.monotonic() >= deadline:
+                raise TimeoutError(
+                    f'Daemon never accepted on {target!r} '
+                    f'within {timeout}s'
+                ) from exc
+            time.sleep(poll_interval)
+        else:
+            sock.close()
+            return
+```
+
+Pros: trivial primitive, no tractor-runtime
+dependency, works pre-yield in the fixture body,
+fail-fast on truly-broken daemon.
+Cons: doesn't actually do an IPC handshake, just
+proves listen-side is up. A daemon that bound but
+hasn't initialized its registrar table yet would
+still race.
+
+### Path B — `tractor.find_actor()` poll
+
+Use the actual discovery API the test would call:
+
+```python
+async def _wait_for_daemon_ready_via_discovery(
+    reg_addr,
+    timeout: float = 10.0,
+    poll_interval: float = 0.05,
+):
+    deadline = trio.current_time() + timeout
+    async with tractor.open_root_actor(
+        registry_addrs=[reg_addr],
+        # ephemeral root just for the probe
+    ):
+        while True:
+            try:
+                async with tractor.find_actor(
+                    'registrar',  # daemon's own name
+                    registry_addrs=[reg_addr],
+                ) as portal:
+                    if portal is not None:
+                        return
+            except Exception:
+                pass
+            if trio.current_time() >= deadline:
+                raise TimeoutError(...)
+            await trio.sleep(poll_interval)
+```
+
+Pros: actually proves the discovery path works,
+handles the "bound but not ready" case naturally.
+Cons: requires booting an ephemeral root actor JUST
+for the probe (overhead), more code, and runs in trio
+which complicates the sync-fixture context. Need a
+`trio.run()` wrapper.
+
+### Recommended: Path A with optional handshake check
+
+Path A is much simpler + handles 95% of the bug
+class. If "bound-but-not-ready" turns out to still
+race (it shouldn't — `tractor.run_daemon` doesn't
+return from `bind()` until the registrar is
+fully populated), escalate to Path B as a focused
+follow-up.
+
+## Workarounds (until fix lands)
+
+1. **Bump `_PROC_SPAWN_WAIT`** higher (current: 0.6).
+   2.0–3.0 hides most flakes at the cost of adding
+   dead time to every test. Not a fix but reduces
+   blast radius while the proper poll lands.
+2. **`pytest-rerunfailures`** with `reruns=1` on the
+   `daemon` fixture's tests specifically. Hides the
+   flake but doesn't address it.
+3. **Mark known-affected tests as `xfail(strict=False)`**
+   under `--ci`. Lets CI go green at the cost of
+   silently hiding regressions.
+
+(Recommend skipping all three — implement the active
+poll instead.)
+
+## Investigation next steps
+
+1. Implement Path A as a `_wait_for_daemon_ready()`
+   helper in `tests/conftest.py`. Replace the
+   `time.sleep(bg_daemon_spawn_delay)` call with it.
+2. Drop the `_PROC_SPAWN_WAIT` constant entirely
+   (active poll obsoletes blind sleep).
+3. Run the suite 5-10 times to validate flake rate
+   drops to 0.
+4. If flakes persist, profile whether the daemon
+   process exits with non-zero before the poll's
+   deadline hits — that'd be a different bug
+   (daemon startup crash) that the blind sleep was
+   masking.
+5. Cross-check `tests/test_multi_program.py::test_*`
+   — multiple tests use the `daemon` fixture; all
+   should benefit from the same poll primitive.
+
+## Related
+
+- `tests/conftest.py::daemon` — the fixture under
+  fix
+- `tests/conftest.py::_PROC_SPAWN_WAIT` — the
+  constant to drop
+- `cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`
+  — distinct flake class (cancel-cascade
+  `TooSlowError` at teardown, not connect-time race)
+- `trio_wakeup_socketpair_busy_loop_under_fork_issue.md`
+  — different bug entirely; this race was masked
+  pre-WakeupSocketpair-patch by the busy-loop
+  hangs.

ai/conc-anal/to_actor_taskman_design.md

@@ -0,0 +1,255 @@
+# `to_actor.open_taskman()` design + impl plan (issue #485)
+
+Self-contained hand-off doc: everything needed to implement the
+tracking issue https://github.com/goodboy/tractor/issues/485
+without prior session context. Read alongside the (shorter)
+issue body; where they differ THIS doc is the more detailed and
+the issue is the contract.
+
+## Context (why this exists)
+
+Issue #477 removed the legacy non-blocking
+`ActorNursery.run_in_actor()` (see PR #484, branch
+`drop_ria_nursery`, + `ria_nursery_removal_plan.md` in this
+dir): its "result at nursery-teardown" semantic required an
+internal reap-cluster whose unowned result-waits produced an
+unbounded-hang class. The blocking successor `to_actor.run()`
+(PR #481) covers one-shots; the *deferred/non-blocking* shape
+now needs a properly scoped home — an explicit supervision
+scope for dynamically spawned remote tasks over a (flat)
+subactor cluster.
+
+Core principle distilled from the #477 arc: **every
+non-blocking remote-task invocation must have an
+explicitly-owned enclosing scope**. Hence NO `Portal.run_soon()`
+public method (a connection handle must not own task lifetimes)
+— the scope-owning object *is* the API.
+
+## Prior art (all three MUST be mined)
+
+1. **`hilevel_serman` branch** (tip `93d161bf`, 2024-12,
+   4 commits): `tractor/hilevel/{__init__,_service.py}` — the
+   `piker.service.Services` port. `open_service_mngr()`
+   (actor-global singleton acm stacking `open_nursery()` +
+   `trio.open_nursery()`), `ServiceMngr` dataclass w/
+   `.start_service_task()` (local bg task w/ cs+done-event),
+   `.start_service_ctx()` (bg-task-supervised remote ctx via
+   `_open_and_supervise_service_ctx()`), `.start_service()`
+   (spawn actor + service ctx), `.cancel_service[_task]()`.
+2. **PR #363** (`oco_supervisor_prototype`, OPEN): the
+   `trionics` "taskman" prototype — a `trio.Nursery`-like
+   per-task-scope-manager via user-defined
+   single-yield-generator hooks. Mine for the per-task
+   scope-hook shape + naming; its in-code ref appears (typo'd
+   as "#346") in `_service.py`'s
+   "TODO, unify this interface with our `TaskManager` PR!".
+3. **`piker.service._mngr.Services`** + the
+   `piker.data.feed.open_feed()` `gather_contexts()` pyramid:
+   the production usage this design must be able to replace.
+
+Also related in-tree: `trionics.gather_contexts(mngrs, tn=None)`
+(the static fan-out cousin) and the `to_actor.open_one_shot()`
+single-task sketch in `ria_nursery_removal_plan.md`.
+
+## `hilevel_serman` rebase + convergence map
+
+Recon (as of `drop_ria_nursery` @ `c62f93a8`):
+
+- 266 commits behind `main`; `tractor/hilevel/` is a NEW dir so
+  NO file-level merge conflicts expected.
+- imports only top-level names (`ActorNursery`, `Context`,
+  `Portal`, `current_actor`, `ContextCancelled`, `log`) — all
+  still exported post-subsystem-reorg. Rebase = API-drift work.
+- **KNOWN BREAKAGE**: `_service.py:292` awaits
+  `portal.wait_for_result()` inside
+  `_open_and_supervise_service_ctx()` — that API was DELETED by
+  PR #484 (`2a59cefb`). Fix: drop the call; the tuple-return
+  becomes just `ctx_res` (the `Portal` "main result" notion no
+  longer exists; the ctx result is the only result).
+- `.uid` usages (`canceller != portal.chan.uid`) may want the
+  newer `.aid.uid` spelling — check against current `Channel`.
+- `log.info(f'`pikerd` service ...')` strings still say
+  "pikerd" — de-piker-ify while touching.
+
+Convergence: which `ServiceMngr` piece informs which taskman
+piece,
+
+| `hilevel_serman` | taskman |
+|---|---|
+| `_open_and_supervise_service_ctx()` | the parked-holder task (core primitive, factor + share) |
+| `.start_service_ctx()` | `tm.run_soon()` (ctx-endpoint flavor) |
+| `.start_service_task()` | (local-task variant; out of scope for taskman, stays service-only) |
+| `.start_service()` | `open_worker_pool()`-ish spawn+run compose |
+| `.cancel_service[_task]()` | `ctx.cancel()` / `tm.cancel()` |
+| singleton `open_service_mngr()` | NOT copied — taskman is plain-scoped, no singleton |
+
+Key semantic DELTA vs `ServiceMngr`: the service holder's
+`finally: await portal.cancel_actor()` couples ACTOR lifetime
+to ctx lifetime. The taskman must NOT do this — in `an=`
+(cluster) placement actors are reused across tasks and their
+lifetime belongs to the caller's `ActorNursery`/pool layer.
+Actor-reaping stays out of the holder task entirely.
+
+## The design
+
+### API surface
+
+```python
+async with to_actor.open_taskman(
+    # placement (pass at most one; both None -> private
+    # call-scoped `open_nursery()` matching `to_actor.run()`)
+    an: ActorNursery|None = None,
+    portal: Portal|None = None,
+
+    # error strategy: 'one_cancels_all' (default) | 'collect'
+    strategy: str = 'one_cancels_all',
+    # exit policy: 'wait' (default, trio-nursery-like) |
+    # 'cancel' (service-style)
+    on_exit: str = 'wait',
+) as tm:
+
+    ctx: Context = await tm.run_soon(
+        fn,                  # plain async fn OR @tractor.context ep
+        ptl=None,            # explicit worker override (BYO balancing)
+        name=None,           # task name, default fn.__name__ (+ dedup)
+        **fn_kwargs,
+    )
+    ...
+    res = await ctx.wait_for_result()   # optional; caller-only
+```
+
+- `tm.tasks: dict[str, Context]` registry; name collision ->
+  `ValueError`.
+- `tm.cancel()`: graceful per-ctx `ctx.cancel()` sweep then
+  holder-release; NO raw `CancelScope` exposure (the rejected
+  `manage_portal() as cs` idea invites hard-cancel where
+  graceful-then-escalate is the SC-blessed order).
+- cluster balancing when `an=`-placed: `round_robin` default
+  over `an`'s portals; `ptl=` per-call override.
+
+### The parked-holder core (per `run_soon()`)
+
+One holder task spawned into the tm's PRIVATE trio nursery:
+
+```python
+async def _holder(...):
+    async with portal.open_context(fn, **kws) as (ctx, first):
+        started_ps.started(ctx)      # hand ctx out to caller
+        await release_evt.wait()     # park — NEVER on the result
+    # acm exit drains/collects the ctx outcome; any error
+    # raises HERE into the tm scope
+```
+
+- **discipline rule**: the caller is the SOLE result consumer
+  (`ctx.wait_for_result()`); the holder never touches it. This
+  avoids the two-awaiters-on-one-stream shape that plagued
+  `run_in_actor()` internals (`._expect_result_ctx`).
+- an un-`wait()`ed task's error still propagates: ctx exit-drain
+  raises into the holder -> tm nursery -> tm scope. Nothing can
+  be silently dropped.
+- release triggers: task's remote completion (see impl note
+  below), `ctx.cancel()`, `tm.cancel()`, tm scope exit.
+- impl note: "park until done OR released" wants
+  `await ctx._scope...`-ish completion OR simply parking on the
+  event and letting exit-drain block on a still-running task
+  per the `on_exit='wait'` policy. Start simple: park on the
+  event; `on_exit='wait'` -> tm exit sets events then the acm
+  exits naturally block until each remote task completes;
+  `on_exit='cancel'` -> `ctx.cancel()` each live task first.
+
+### Endpoint flavors
+
+`run_soon()` accepts BOTH,
+
+- `@tractor.context` endpoints -> `portal.open_context()`
+  (full streaming; the holder shape above).
+- plain async fns -> the `Portal.run()`-style
+  `Actor.start_remote_task()` ctx (one-way protocol; no
+  `ctx.started()` handshake so `first` is None-ish). Dispatch
+  on the `_tractor_context_function`/`_tractor_stream_function`
+  markers (see `to_actor._api._validate_one_shot_fn()` +
+  `Portal.run()` for the existing dispatch precedents).
+
+This kills the `@context`-shim friction the #477 migration
+exposed (`assert_err_ctx` etc. in `test_cancellation.py`).
+
+### Supervision strategies
+
+- `one_cancels_all` (default): holder error propagates through
+  the tm nursery -> siblings cancelled — plain trio semantics.
+- `collect`: each holder catches its task's
+  `RemoteActorError`, stashes it, keeps siblings running; at tm
+  exit raise the lot as a `BaseExceptionGroup` (single error
+  collapses per the runtime `collapse_eg()` convention). This
+  resurrects the deterministic reap-all `BEG`-of-N *opt-in*:
+  `test_multierror`-class assertions can re-tighten and the
+  collect-don't-cancel boilerplate in
+  `examples/debugging/multi_subactors.py` becomes a one-liner.
+- future (NOT PR A): restart strategies (`one_for_one`...) —
+  the Erlang-supervisor roadmap finally has a natural home.
+
+### Resolved design items (w/ reasoning)
+
+1. **exit-policy default = `wait`**: matches `trio.Nursery`
+   block-exit semantics (least surprise for the "task nursery"
+   framing); service-style forever-tasks opt into
+   `on_exit='cancel'` (what `piker`'s `Services` effectively
+   does) or use `tm.cancel()`.
+2. **`collect` returns nothing extra**: errors group-raise at
+   exit; VALUES stay per-ctx (`ctx.wait_for_result()`) — the tm
+   carries error *policy*, not result aggregation (keeps the
+   surface minimal; a gather-style values helper can wrap later).
+3. **teardown ordering**: tm ctx-drain/cancel completes before
+   any actor teardown *structurally* — `open_taskman(an=an)`
+   nests inside the `an` block so acm exit order guarantees it;
+   the holder never actor-cancels (see the ServiceMngr delta
+   above).
+4. **`hilevel_serman` inclusion**: rebase it as PR A's opening
+   commits (it's self-contained, +618 lines, no conflicts, one
+   API fix) and factor the shared supervised-ctx core so
+   `ServiceMngr` + taskman diverge only in policy
+   (actor-coupled + singleton vs plain-scoped). If the rebase
+   fights back, fall back to pattern-mining only and leave
+   `hilevel_serman` for its own PR — do NOT let it block the
+   taskman.
+
+## PR plan
+
+- **PR A** (`to_actor/_taskman.py` MVP):
+  1. rebase `hilevel_serman` -> current `main`-line (fix the
+     `portal.wait_for_result()` breakage, de-piker-ify strs).
+  2. factor the parked-holder core; implement `ActorTaskMngr` +
+     `open_taskman()` + `run_soon()` per above.
+  3. test suite `tests/test_taskman.py` mirroring
+     `test_to_actor.py`'s structure: placement variants, both
+     endpoint flavors, both strategies, both exit policies,
+     `tm.cancel()`, error-relay + collect-BEG shapes,
+     name-collision, cluster round-robin + `ptl=` override.
+  4. docs: extend the one-shot sections
+     (`docs/guide/{spawning,rpc}.rst`, `docs/api/core.rst`).
+- **PR B**: `open_worker_pool(count=, names=, modules=)`
+  (absorbs #172) + reimplement/deprecate
+  `_clustering.open_actor_cluster()` atop; port
+  `test_trynamic_trio` + `a_trynamic_first_scene.py` (the
+  mutual-rendezvous boilerplate from `a297a32a`) +
+  `multi_subactors` collect pattern + re-tighten
+  `test_multierror`-class assertions; add
+  `examples/parallelism/taskman_pool.py`.
+- **PR C** (stretch, `piker`-side): swap
+  `Services.start_service_task()` internals (and eventually the
+  `open_feed()` pyramid) onto the upstream taskman.
+
+## Verification gates (repo conventions)
+
+- per-commit module gates on the `trio` backend + `mp_spawn`
+  spot-gates; ALWAYS include `tests/test_infected_asyncio.py`
+  in any gate touching spawn/supervise machinery (the #477
+  lesson).
+- `tests/devx/test_debugger.py` must stay byte-identical if any
+  `examples/debugging/` file is touched.
+- full suite (`uv run pytest tests/` w/
+  `UV_PROJECT_ENVIRONMENT=py313`) green on `trio` before PR;
+  NB the *full-session* `mp_spawn` run mass-fails pre-existing
+  (`KeyError` in `an.cancel()`; unexercised by CI's trio-only
+  matrix) — do not chase it here.
+- docs `uv run --group docs make -C docs html` clean.

ai/conc-anal/trio_033_cancel_cascade_slowdown_depth3_issue.md

@@ -0,0 +1,102 @@
+# `trio` 0.29 -> 0.33 slows the depth=3 cancel-cascade
+
+## Symptom
+
+After locking to `trio==0.33.0` (commit `c7741bba`, was
+`0.29.0`), this test reliably trips its `fail_after`
+deadline on the **`trio`** backend:
+
+```
+FAILED tests/test_cancellation.py::test_nested_multierrors[start_method=trio-depth=3]
+  - AssertionError: assert False
+    where False = isinstance(
+      Cancelled(source='deadline', source_task=None, reason=None),
+      tractor.RemoteActorError,
+    )
+```
+
+A `fail_after_w_trace` hang-snapshot is captured for the
+test each run (deadline-injected `Cancelled` wrapped into
+the actor-nursery `BaseExceptionGroup`).
+
+## Root cause (immediate)
+
+The test budgets `fail_after(6)` for the `trio` backend.
+That 6s was chosen (commit `32955db0`, while `trio==0.29`)
+with the assertion that trio finishes "well under" 6s.
+The `trio` 0.29 -> 0.33 bump slowed the depth=3 cascade
+past that budget, so the 6s deadline now fires mid-cascade.
+
+trio 0.33 added **cancel-reason tracking** — every
+`Cancelled` now carries `(source=, reason=, source_task=)`.
+The injected exc is `Cancelled(source='deadline')`, i.e.
+trio itself naming our `fail_after(6)` scope as the cancel
+origin. When that `Cancelled` collapses one branch of the
+nursery BEG, the test's `isinstance(subexc,
+RemoteActorError)` assertion fails. The healthy outcome is
+`BEG = [RemoteActorError, RemoteActorError]`; the
+`Cancelled` is purely an artifact of the deadline cutting
+the cascade short.
+
+## Measurements (standalone, this machine)
+
+```
+depth=1  trio   ~3.15s   PASS  (keeps 6s budget)
+depth=3  trio   ~6.8-8.2s  FAIL @ 6s  (now bumped to 12s)
+```
+
+depth=1 still fits comfortably; only depth=3 (deeper
+recursive spawn-and-error tree => more actors to reap)
+exceeds the old budget. The ~2s/depth-level cost looks
+like serialized per-actor reap / `terminate_after` waits.
+
+## Mitigation applied
+
+`test_nested_multierrors` now splits the `trio` budget:
+
+```python
+case ('trio', 1):
+    timeout = 6
+case ('trio', 3):
+    timeout = 12   # was 6; see this doc
+```
+
+This stops the deadline from firing so the cascade
+completes naturally to `[RAE, RAE]`.
+
+## Also affected — same root cause, different test
+
+`test_echoserver_detailed_mechanics[trio-raise_error=KeyboardInterrupt]`
+(`tests/test_infected_asyncio.py`) tripped the *same*
+slowdown via its much tighter `trio` budget of `1s`. The
+single-aio-subactor teardown now takes ~1s, so the `1s`
+`fail_after` raced the deadline (PASS at 0.99s / FAIL at
+1.03s across back-to-back standalone runs). On a deadline-
+fire the injected `Cancelled(source='deadline')` wraps the
+mid-stream `KeyboardInterrupt` into a `BaseExceptionGroup`,
+which is NOT a `KeyboardInterrupt` so the bare
+`pytest.raises(KeyboardInterrupt)` fails. (The sibling
+`raise_error=Exception` variant only "passes" by accident:
+an `ExceptionGroup` *is-a* `Exception`, so its
+`pytest.raises(Exception)` still matches even when wrapped.)
+
+Mitigation: bump that `trio` budget `1 -> 4s` (matching the
+forking-spawner case). Without a deadline-fire the KBI
+propagates bare and the assertion passes.
+
+## Open follow-up (the actual regression)
+
+The budget bump is a band-aid — the underlying question is
+**why** the depth=3 `trio` cancel-cascade went from <6s to
+~7-8s across `trio` 0.29 -> 0.33. Candidate avenues:
+
+- which scope owns the per-actor `terminate_after` wait,
+  and are the tree's reaps concurrent or serialized?
+- did trio 0.33's abort/reschedule or cancel-reason
+  bookkeeping change checkpoint timing on the cancel path?
+
+If/when the cascade speeds back up under-budget, depth=3
+will start completing well under 12s — at which point the
+budget can be tightened back toward 6s as a regression
+tripwire. Related (different backend, same cascade class):
+`cancel_cascade_too_slow_under_main_thread_forkserver_issue.md`.

ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md

@@ -0,0 +1,221 @@
+# trio `WakeupSocketpair.drain()` busy-loop in forked child (peer-closed missed-EOF)
+
+## Reproducer
+
+```bash
+./py313/bin/python -m pytest \
+  tests/test_multi_program.py::test_register_duplicate_name \
+  --tpt-proto=tcp \
+  --spawn-backend=main_thread_forkserver \
+  -v --capture=sys
+```
+
+Subactor pegs a CPU core indefinitely; parent test
+hangs waiting for the subactor.
+
+## Empirical evidence (caught alive)
+
+```
+$ sudo strace -p <subactor-pid>
+recvfrom(6, "", 65536, 0, NULL, NULL)   = 0
+recvfrom(6, "", 65536, 0, NULL, NULL)   = 0
+recvfrom(6, "", 65536, 0, NULL, NULL)   = 0
+... (no `epoll_wait`, no other syscalls, just this back-to-back)
+```
+
+Pattern: tight C-level `recvfrom` loop returning 0
+each call. No `epoll_wait` between iterations →
+**not trio's task scheduler**. Pure synchronous C
+loop.
+
+```
+$ sudo readlink /proc/<subactor-pid>/fd/6
+socket:[<inode>]
+
+$ sudo lsof -p <subactor-pid> | grep ' 6u'
+<cmd> <pid> goodboy 6u unix 0xffff... 0t0 <inode> type=STREAM (CONNECTED)
+```
+
+fd=6 is an **AF_UNIX socket** in CONNECTED state.
+Even though the test uses `--tpt-proto=tcp`, this fd
+is NOT a tractor IPC channel — it's an internal
+trio socketpair.
+
+## Root-cause: `WakeupSocketpair.drain()`
+
+`/site-packages/trio/_core/_wakeup_socketpair.py`:
+
+```python
+class WakeupSocketpair:
+    def __init__(self) -> None:
+        self.wakeup_sock, self.write_sock = socket.socketpair()
+        self.wakeup_sock.setblocking(False)
+        self.write_sock.setblocking(False)
+        ...
+
+    def drain(self) -> None:
+        try:
+            while True:
+                self.wakeup_sock.recv(2**16)
+        except BlockingIOError:
+            pass
+```
+
+`socket.socketpair()` on Linux defaults to AF_UNIX
+SOCK_STREAM. Both ends non-blocking. Normal flow:
+
+1. Signal/wake event → `write_sock.send(b'\x00')`
+   queues a byte.
+2. `wakeup_sock` becomes readable → trio's epoll
+   triggers.
+3. Trio calls `drain()` to flush the buffer.
+4. drain loops on `wakeup_sock.recv(64KB)`.
+5. Eventually buffer empty → non-blocking socket
+   raises `BlockingIOError` → except → break.
+
+**Bug surface — peer-closed missed-EOF**:
+
+Non-blocking socket semantics:
+- buffer has data → `recv` returns N>0 bytes (loop continues)
+- buffer empty → `recv` raises `BlockingIOError`
+- **peer FIN'd → `recv` returns 0 bytes (NEITHER exception NOR
+  break — infinite tight loop)**
+
+`drain()` does not handle the `b''` return-value
+(EOF) case. If `write_sock` has been closed (or the
+process holding it is gone), every iteration returns
+0 → infinite loop → 100% CPU on a single core.
+
+## Why this triggers under `main_thread_forkserver`
+
+Under `os.fork()` from the forkserver-worker thread:
+
+1. Parent has a `WakeupSocketpair` instance with
+   `wakeup_sock=fdN`, `write_sock=fdM`. Both fds
+   open in parent.
+2. Fork → child inherits BOTH fds (kernel-level fd
+   table dup).
+3. `_close_inherited_fds()` runs in child →
+   closes everything except stdio. `wakeup_sock` and
+   `write_sock` of the parent's `WakeupSocketpair`
+   ARE closed in child.
+4. Child's trio (running fresh) creates its OWN
+   `WakeupSocketpair` → NEW fd numbers (e.g. fd 6, 7).
+5. **In `infect_asyncio` mode** the asyncio loop is
+   the host; trio runs as guest via
+   `start_guest_run`. trio still creates its
+   `WakeupSocketpair` in the I/O manager but its
+   role is different.
+
+The race window: somewhere between (3) and (5), if a
+`WakeupSocketpair` Python object reference inherited
+via COW (from parent's pre-fork heap) survives long
+enough that `drain()` is called on it AFTER its fds
+were closed but BEFORE the child's NEW socketpair
+takes over the recycled fd numbers — the recycled fd
+will be one of the child's NEW socketpair ends, whose
+peer might be FIN-flagged (e.g. parent-process
+peer-end is closed).
+
+Or simpler: the `wait_for_actor`/`find_actor` discovery
+flow in `test_register_duplicate_name` triggers an
+unusual code path where a stale `WakeupSocketpair`
+gets `drain()`-called on a fd whose peer has already
+closed.
+
+## Why `drain()` shouldn't loop indefinitely on EOF
+(upstream trio bug)
+
+Even WITHOUT fork, `drain()` should treat `b''` as
+EOF and break. The current code is correct for the
+"buffer drained on a healthy socketpair" scenario but
+incorrect for the "peer is gone" scenario. It's a
+defensive-programming gap in trio.
+
+A one-line patch upstream:
+
+```python
+def drain(self) -> None:
+    try:
+        while True:
+            data = self.wakeup_sock.recv(2**16)
+            if not data:
+                break  # peer-closed; nothing more to drain
+    except BlockingIOError:
+        pass
+```
+
+## Workarounds (until the underlying issue lands)
+
+1. **Skip-mark on the fork backend**:
+   `tests/test_multi_program.py` →
+   `pytest.mark.skipon_spawn_backend('main_thread_forkserver',
+   reason='trio WakeupSocketpair.drain busy-loop, see ai/conc-anal/trio_wakeup_socketpair_busy_loop_under_fork_issue.md')`.
+
+2. **Defensive monkey-patch in tractor's
+   forkserver-child prelude** — wrap
+   `WakeupSocketpair.drain` to handle `b''`:
+
+   ```python
+   # in `_actor_child_main` or `_close_inherited_fds`'s
+   # post-fork prelude:
+   from trio._core._wakeup_socketpair import WakeupSocketpair
+   _orig_drain = WakeupSocketpair.drain
+   def _safe_drain(self):
+       try:
+           while True:
+               data = self.wakeup_sock.recv(2**16)
+               if not data:
+                   return  # peer closed
+       except BlockingIOError:
+           pass
+   WakeupSocketpair.drain = _safe_drain
+   ```
+
+   Tracks upstream — remove once trio fixes.
+
+3. **Upstream the fix**: 1-line PR to `python-trio/trio`
+   adding `if not data: break` to `drain()`.
+
+## Investigation next steps
+
+1. **Confirm via py-spy**: when caught alive, detach
+   strace first then
+   `sudo py-spy dump --pid <subactor> --locals`. The
+   busy thread should show `drain` from `WakeupSocketpair`
+   in the call chain.
+2. **Identify which write-end peer is closed**: from
+   the inode of fd 6, look up the matching peer
+   inode via `ss -xp` and see whose process it
+   was/is.
+3. **Verify the missed-EOF hypothesis**: hand-craft a
+   minimal `WakeupSocketpair` repro:
+
+   ```python
+   from trio._core._wakeup_socketpair import WakeupSocketpair
+   ws = WakeupSocketpair()
+   ws.write_sock.close()  # simulate peer-gone
+   ws.drain()             # should hang forever
+   ```
+
+## Sibling bug
+
+`tests/test_infected_asyncio.py::test_aio_simple_error`
+hangs under the same backend with a DIFFERENT
+fingerprint (Mode-A deadlock, both parties in
+`epoll_wait`, no busy-loop). Distinct root cause —
+see `infected_asyncio_under_main_thread_forkserver_hang_issue.md`.
+
+Both share the broader theme: **trio internal-state
+initialization isn't fully fork-safe under
+`main_thread_forkserver`** for the more exotic
+dispatch paths.
+
+## See also
+
+- [#379](https://github.com/goodboy/tractor/issues/379) — subint umbrella
+- python-trio/trio#1614 — trio + fork hazards
+- `trio._core._wakeup_socketpair.WakeupSocketpair`
+  source (the smoking gun)
+- `ai/conc-anal/fork_thread_semantics_execution_vs_memory.md`
+- `ai/conc-anal/infected_asyncio_under_main_thread_forkserver_hang_issue.md`

ai/prompt-io/claude/20260406T172848Z_02b2ef1_prompt_io.md

@@ -0,0 +1,54 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-06T17:28:48Z
+git_ref: 02b2ef1
+scope: tests
+substantive: true
+raw_file: 20260406T172848Z_02b2ef1_prompt_io.raw.md
+---
+
+## Prompt
+
+User asked to extend `tests/test_resource_cache.py` with a test
+that reproduces the edge case fixed in commit `02b2ef18` (per-key
+locking+user tracking in `maybe_open_context()`). The bug was
+originally triggered in piker's `brokerd.kraken` backend where the
+same `acm_func` was called with different kwargs, and the old
+global `_Cache.users` counter caused:
+
+- teardown skipped for one `ctx_key` bc another key's users kept
+  the global count > 0
+- re-entry hitting `assert not resources.get(ctx_key)` during the
+  teardown window
+
+User requested a test that would fail under the old code and pass
+with the fix.
+
+## Response summary
+
+Designed and implemented `test_per_ctx_key_resource_lifecycle`
+which verifies per-`ctx_key` resource isolation by:
+
+1. Holding resource `'a'` open in a bg task
+2. Opening+closing resource `'b'` (same `acm_func`, different
+   kwargs) while `'a'` is still alive
+3. Re-opening `'b'` and asserting cache MISS — proving `'b'` was
+   torn down independently despite `'a'` keeping its own user
+   count > 0
+
+With the old global counter, phase 3 would produce a stale cache
+HIT (leaked resource) or crash on the assert.
+
+Also added a trivial `acm_with_resource(resource_id)` ACM helper
+at module level.
+
+## Files changed
+
+- `tests/test_resource_cache.py` — add `acm_with_resource` ACM +
+  `test_per_ctx_key_resource_lifecycle` test fn
+
+## Human edits
+
+None — committed as generated (pending user review).

ai/prompt-io/claude/20260406T193125Z_85f9c5d_prompt_io.md

@@ -0,0 +1,57 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-06T19:31:25Z
+git_ref: 85f9c5d
+scope: tests
+substantive: true
+raw_file: 20260406T193125Z_85f9c5d_prompt_io.raw.md
+---
+
+## Prompt
+
+User asked to reproduce the exact `assert not resources.get(ctx_key)`
+crash originally seen in piker's `brokerd.kraken` backend via
+`open_cached_client('kraken')`. Key constraints from user:
+
+- In piker, kwargs were the **same** (empty) so all callers
+  share one `ctx_key = (fid, ())`
+- The root issue is `_Cache.locks` being indexed by `fid`
+  rather than `ctx_key`, plus the race window between
+  `values.pop()` and `resources.pop()` in `_Cache.run_ctx`
+  (the acm `__aexit__` has checkpoints in between)
+- Mark the test `@pytest.mark.xfail` so it can be committed
+  against the unpatched code and later adjusted once the fix
+  from `9e49eddd` is applied
+
+User pointed to piker's `open_cached_client('kraken')` usage
+as the real-world pattern to model.
+
+## Response summary
+
+Added `test_moc_reentry_during_teardown` which deterministically
+reproduces the teardown race:
+
+1. A `cached_client()` acm (no params, like
+   `kraken.api.get_client()`) signals via `in_aexit` event
+   when its `__aexit__` starts, then sleeps to hold the
+   window open
+2. `use_and_exit` task enters+exits the cached resource
+3. `reenter_during_teardown` waits on `in_aexit` then
+   re-enters — landing exactly in the window where
+   `values` is popped but `resources` still exists
+4. The old `assert not resources.get(ctx_key)` fires
+5. `@pytest.mark.xfail(raises=AssertionError)` catches it
+
+Test confirmed: `XFAIL` with the exact traceback at
+`_mngrs.py:327`.
+
+## Files changed
+
+- `tests/test_resource_cache.py` — add
+  `test_moc_reentry_during_teardown` xfail test fn
+
+## Human edits
+
+None — committed as generated (pending user review).

ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.md

@@ -0,0 +1,52 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-06T22:26:48Z
+git_ref: f086222
+scope: code
+substantive: true
+raw_file: 20260406T222648Z_f086222_prompt_io.raw.md
+---
+
+## Prompt
+
+User applied the per-key locking patch (`f086222d`),
+removed the `@pytest.mark.xfail` from
+`test_moc_reentry_during_teardown`, and found the
+test STILL fails — now with `RuntimeError` instead
+of `AssertionError`. Asked to diagnose why the fix
+doesn't actually resolve this race.
+
+## Response summary
+
+Traced the exact scheduling sequence across three
+concurrent tasks to show that the per-`ctx_key`
+locking change doesn't close the fundamental gap:
+
+- `maybe_open_context`'s finally pops the lock and
+  sets `no_more_users` in the **exiting caller's
+  task**
+- But the actual resource cleanup (`values.pop`,
+  acm `__aexit__`, `resources.pop`) runs in the
+  **`run_ctx` task** inside `service_tn`
+- A re-entering task creates a fresh lock (old one
+  popped), acquires immediately, and hits stale
+  `resources[ctx_key]` while `run_ctx` is still in
+  `__aexit__`
+
+Identified three possible fix strategies:
+1. Let `run_ctx` own lock release/pop after
+   `resources.pop()`
+2. Add a "teardown complete" event that new callers
+   wait on
+3. Move `resources.pop()` into `run_ctx`'s inner
+   finally (before acm `__aexit__`)
+
+## Files changed
+
+No code changes — analysis only.
+
+## Human edits
+
+N/A — diagnostic output, no code generated.

ai/prompt-io/claude/20260406T222648Z_f086222_prompt_io.raw.md

@@ -0,0 +1,32 @@
+---
+model: claude-opus-4-6
+service: claude
+timestamp: 2026-04-06T22:26:48Z
+git_ref: f086222
+diff_cmd: git diff f086222~1..f086222
+---
+
+Here's the problem. The per-key locking doesn't fix this race because the **lock lifetime is decoupled from `run_ctx`'s lifetime**. Trace through what happens:
+
+**`maybe_open_context` finally** (lines 468-495):
+1. `users[ctx_key] -= 1` → 0
+2. `no_more_users.set()` → wakes `run_ctx` (but it doesn't run yet, just becomes ready)
+3. `_Cache.locks.pop(ctx_key)` → **lock is gone**
+4. `maybe_open_context` exits
+
+**`run_ctx`** now gets scheduled (lines 237-241):
+5. Inner finally: `values.pop(ctx_key)` → values gone
+6. `mng.__aexit__()` runs → `in_aexit.set()`, `await trio.sleep(10)` → **CHECKPOINT**
+
+**`reenter_during_teardown`** wakes:
+7. Enters `maybe_open_context` → no lock exists for `ctx_key` → creates **fresh** lock, acquires immediately
+8. `values[ctx_key]` → `KeyError`
+9. `resources.get(ctx_key)` → **still exists!** (step 6 hasn't reached `resources.pop()` in `run_ctx`'s outer finally yet)
+10. `raise RuntimeError('Caching resources ALREADY exist?!')`
+
+The core issue: `no_more_users.set()` (step 2) and `locks.pop()` (step 3) happen in the **exiting caller's task**, but the actual resource cleanup (`values.pop`, acm `__aexit__`, `resources.pop`) happens in the **`run_ctx` task** inside `service_tn`. There's no synchronization between "lock removed, new callers welcome" and "run_ctx has actually finished tearing down". The per-`ctx_key` lock change just made the lock more granular — it didn't close this gap.
+
+The fix needs to ensure a new caller can't acquire a lock for `ctx_key` until `run_ctx` has fully exited (including `resources.pop()`). Either:
+- **don't pop the lock in `maybe_open_context`** — let `run_ctx` release/pop it after `resources.pop()`
+- **wait on a "teardown complete" event** in the cache-miss path when stale `resources` exist
+- **pop `resources` before the acm `__aexit__`** (move `resources.pop()` into the inner finally alongside `values.pop()`)

ai/prompt-io/claude/20260413T192116Z_f851f28_prompt_io.md

@@ -0,0 +1,74 @@
+---
+model: claude-opus-4-6
+service: claude
+session: (ad-hoc, not tracked via conf.toml)
+timestamp: 2026-04-13T19:21:16Z
+git_ref: f851f28
+scope: code
+substantive: true
+---
+
+## Prompt
+
+User provided a detailed implementation plan for
+a new `test_tpt_bind_addrs.py` test suite covering
+`open_root_actor(tpt_bind_addrs=...)` — the three
+runtime code paths in `_root.py:385-450`:
+
+1. Non-registrar, no explicit bind -> random addrs
+2. Registrar, no explicit bind -> registry_addrs
+3. Explicit bind given -> `wrap_address()` + merge
+
+Plan specified 6 test functions (~10 parametrized
+variants), predicted a type-mixing bug at line 446,
+and asked for an in-flight fix if confirmed.
+
+## Response summary
+
+Created `tests/discovery/test_tpt_bind_addrs.py`
+with 9 collected test variants across 6 functions:
+
+- `test_registrar_root_tpt_bind_addrs` (3 variants:
+  `bind-eq-reg`, `bind-subset-reg`,
+  `bind-disjoint-reg`)
+- `test_non_registrar_root_tpt_bind_addrs`
+  (2 variants: `bind-same-bindspace`,
+  `bind-disjoint`)
+- `test_non_registrar_default_random_bind`
+  (baseline, no explicit bind)
+- `test_tpt_bind_addrs_as_maddr_str`
+  (multiaddr string input)
+- `test_registrar_merge_binds_union`
+  (registrar + disjoint bind -> union)
+- `test_open_nursery_forwards_tpt_bind_addrs`
+  (`open_nursery(**kwargs)` forwarding)
+
+Confirmed and fixed the predicted bug at
+`_root.py:446`: the registrar merge path mixed
+`Address` objects (`tpt_bind_addrs`) with raw tuples
+(`uw_reg_addrs`) inside `set()`, preventing
+deduplication and causing double-bind `OSError`.
+
+Fix: wrap `uw_reg_addrs` before the set union:
+```python
+# before (broken)
+tpt_bind_addrs = list(set(
+    tpt_bind_addrs + uw_reg_addrs
+))
+# after (fixed)
+tpt_bind_addrs = list(set(
+    tpt_bind_addrs
+    + [wrap_address(a) for a in uw_reg_addrs]
+))
+```
+
+All 9 tests pass after the fix.
+
+## Files changed
+
+- `tests/discovery/test_tpt_bind_addrs.py` (new)
+- `tractor/_root.py:446` (bug fix, 1 line)
+
+## Human edits
+
+N/A — pending review.

ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.md

@@ -0,0 +1,50 @@
+---
+model: claude-opus-4-6
+service: claude
+session: 76154e65-d8e1-4b5f-9275-0ea45ba7e98a
+timestamp: 2026-04-13T20:50:48Z
+git_ref: 269d939c
+scope: code
+substantive: true
+raw_file: 20260413T205048Z_269d939c_prompt_io.raw.md
+---
+
+## Prompt
+
+Implement a `parse_endpoints()` API in
+`tractor.discovery._multiaddr` that lets downstream
+projects declare per-actor transport bind addresses
+as a service table of actor-name -> multiaddr
+strings (loaded from config, e.g. TOML `[network]`
+section). Add type aliases `EndpointsTable` and
+`ParsedEndpoints`, plus 7 unit tests covering TCP,
+UDS, tuples, mixed input, unsupported protocols, and
+edge cases.
+
+A detailed implementation plan was provided
+specifying insertion points, type signatures, test
+names, and verification commands.
+
+## Response summary
+
+Add `parse_endpoints()` function with two supporting
+type aliases to `_multiaddr.py`. The function
+iterates a `dict[str, list[str|tuple]]` service
+table and delegates each entry to the existing
+`wrap_address()` helper, which already handles maddr
+strings, raw tuples, and pre-wrapped `Address`
+objects. Seven pure unit tests (no trio runtime)
+validate all input variants and edge cases. All 22
+multiaddr tests pass.
+
+## Files changed
+
+- `tractor/discovery/_multiaddr.py` — add
+  `EndpointsTable`, `ParsedEndpoints` type aliases
+  and `parse_endpoints()` function after line 133
+- `tests/discovery/test_multiaddr.py` — add
+  `parse_endpoints` import and 7 new test functions
+
+## Human edits
+
+None — committed as generated.

ai/prompt-io/claude/20260413T205048Z_269d939c_prompt_io.raw.md

@@ -0,0 +1,32 @@
+---
+model: claude-opus-4-6
+service: claude
+timestamp: 2026-04-13T20:50:48Z
+git_ref: 269d939c
+diff_cmd: git diff 269d939c~1..269d939c
+---
+
+## Implementation output
+
+### `tractor/discovery/_multiaddr.py`
+
+> `git diff 269d939c~1..269d939c -- tractor/discovery/_multiaddr.py`
+
+Type aliases `EndpointsTable` and `ParsedEndpoints`
+plus `parse_endpoints()` helper that wraps each
+entry via `wrap_address()`.
+
+### `tests/discovery/test_multiaddr.py`
+
+> `git diff 269d939c~1..269d939c -- tests/discovery/test_multiaddr.py`
+
+Add import of `parse_endpoints` to existing import
+block, then 7 new test functions.
+
+### Test run output
+
+```
+22 passed, 1 warning in 0.05s
+```
+
+All 22 tests pass (15 existing + 7 new).

ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.md

@@ -0,0 +1,38 @@
+---
+model: claude-opus-4-6
+service: claude
+session: multiaddr-support-rename-prefer
+timestamp: 2026-04-14T16:33:00Z
+git_ref: befedc49
+scope: code
+substantive: true
+raw_file: 20260414T163300Z_befedc49_prompt_io.raw.md
+---
+
+## Prompt
+
+Create a helper function that determines the best transport given
+actor locality (distributed vs same host). Use PID/hostname
+comparison for locality detection, apply at registry addr selection
+only (not spawn-time).
+
+## Response summary
+
+New `prefer_addr()` + `_is_local_addr()` helpers
+in `_api.py` using `socket.getaddrinfo()` and
+`ipaddress` for PID/hostname locality detection.
+Preference: UDS > local TCP > remote TCP.
+Integrated into `query_actor()` and
+`wait_for_actor()`. Also changed
+`Registrar.find_actor()` to return full addr list
+so callers can apply preference.
+
+## Files changed
+
+- `tractor/discovery/_discovery.py` → `_api.py`
+  — renamed + added `prefer_addr()`,
+  `_is_local_addr()`; updated `query_actor()` and
+  `wait_for_actor()` call sites
+- `tractor/discovery/_registry.py`
+  — `Registrar.find_actor()` returns
+  `list[UnwrappedAddress]|None`

ai/prompt-io/claude/20260414T163300Z_befedc49_prompt_io.raw.md

@@ -0,0 +1,62 @@
+---
+model: claude-opus-4-6
+service: claude
+timestamp: 2026-04-14T16:33:00Z
+git_ref: befedc49
+diff_cmd: git diff befedc49~1..befedc49
+---
+
+### `tractor/discovery/_api.py`
+
+> `git diff befedc49~1..befedc49 -- tractor/discovery/_api.py`
+
+Add `_is_local_addr()` and `prefer_addr()` transport
+preference helpers.
+
+#### `_is_local_addr(addr: Address) -> bool`
+
+Determines whether an `Address` is reachable on the
+local host:
+
+- `UDSAddress`: always returns `True`
+  (filesystem-bound, inherently local)
+- `TCPAddress`: checks if `._host` is a loopback IP
+  via `ipaddress.ip_address().is_loopback`, then
+  falls back to comparing against the machine's own
+  interface IPs via
+  `socket.getaddrinfo(socket.gethostname(), None)`
+
+#### `prefer_addr(addrs: list[UnwrappedAddress]) -> UnwrappedAddress`
+
+Selects the "best" transport address from a
+multihomed actor's address list. Wraps each
+candidate via `wrap_address()` to get typed
+`Address` objects, then classifies into three tiers:
+
+1. **UDS** (same-host guaranteed, lowest overhead)
+2. **TCP loopback / same-host IP** (local network)
+3. **TCP remote** (only option for distributed)
+
+Within each tier, the last-registered (latest) entry
+is preferred. Falls back to `addrs[-1]` if no
+heuristic matches.
+
+### `tractor/discovery/_registry.py`
+
+> `git diff befedc49~1..befedc49 -- tractor/discovery/_registry.py`
+
+`Registrar.find_actor()` return type broadened from
+single addr to `list[UnwrappedAddress]|None` — full
+addr list lets callers apply transport preference.
+
+#### Integration
+
+`query_actor()` and `wait_for_actor()` now call
+`prefer_addr(addrs)` instead of `addrs[-1]`.
+
+### Verification
+
+All discovery tests pass (13/13 non-daemon).
+`test_local.py` and `test_multi_program.py` also
+pass (daemon fixture teardown failures are
+pre-existing and unrelated).

ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.md

@@ -0,0 +1,101 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-spawner-design-kickoff
+timestamp: 2026-04-17T03:49:18Z
+git_ref: 9703210
+scope: docs
+substantive: true
+raw_file: 20260417T034918Z_9703210_prompt_io.raw.md
+---
+
+## Prompt
+
+Drive the "first big boi, from GH issue" task seeded by
+`ai/prompt-io/prompts/subints_spawner.md`: design, plan
+and implement sub-interpreter (subint) spawn-backend
+support per issue #379, including (1) modularizing
+`tractor.spawn._spawn` into per-backend submods, (2) a new
+`._subint` backend, and (3) harness parametrization via the
+existing `--spawn-backend` / `start_method` pytest fixture
+in `tractor._testing.pytest`.
+
+Follow-up clarifications from the user (this turn):
+1. Pin `<3.15` on this dev branch and feature-gate subint
+   tests — chose option (a).
+2. Split Phase A (modularization) into its own PR first.
+3. Defer the `fork()`-via-subint hack to a follow-up.
+4. Harness flag is `pytest --spawn-backend <key>` CLI →
+   `start_method` fixture (prompt file updated to match).
+
+## Response summary
+
+Produced a three-phase plan and a concrete Phase A (pure
+modularization) file-split plan for user review; no code
+written yet — the green-light to start Phase A was given
+in this same turn conditional on logging this prompt-io
+entry first.
+
+Phases:
+- **A — modularize** `tractor/spawn/_spawn.py` (847 LOC):
+  keep generic machinery in `_spawn.py`, extract
+  `trio_proc` → `spawn/_trio.py`, `mp_proc` →
+  `spawn/_mp.py`. No pin bump.
+- **B — `_subint` backend**: bump `pyproject.toml`
+  `requires-python` upper to `<3.15`; add `'subint'` to
+  `SpawnMethodKey`; reuse existing UDS transport; shm
+  escape-hatch deferred.
+- **C — harness**: drive the valid-backend tuple in
+  `tractor/_testing/pytest.py:345-349` from
+  `typing.get_args(SpawnMethodKey)`; skip subint tests on
+  Python < 3.14.
+
+Key findings surfaced to the user:
+- `pyproject.toml:12` currently pins `<3.14`; PEP 734
+  `concurrent.interpreters` only ships in 3.14 — the
+  load-bearing constraint.
+- `_testing/pytest.py:345-349` hardcodes valid backends
+  as a string tuple (`'mp_spawn'`, `'mp_forkserver'`,
+  `'trio'`) — should be `get_args(SpawnMethodKey)`.
+- `_testing/pytest.py:228` already imports
+  `try_set_start_method` from `tractor.spawn._spawn` —
+  keeping the `_spawn.py` path as the "core" module
+  avoids breaking external refs during Phase A.
+
+Phase A commit breakdown (each green via `/run-tests`):
+1. Drive `_testing/pytest.py` backend-tuple from
+   `get_args(SpawnMethodKey)` — prep.
+2. Extract `trio_proc` → `spawn/_trio.py`; `_methods`
+   registry imports it.
+3. Extract `mp_proc` → `spawn/_mp.py`; `_methods` imports
+   it.
+4. Tidy `spawn/__init__.py` docstring for the new layout.
+
+Workflow: Phase A runs in a new worktree via `/open-wkt
+spawn_modularize` (branch `wkt/spawn_modularize`) and
+lands as its own PR before Phase B/C returns to the
+current `claude_bun_opus4.7_subint_spawner_backend`
+branch.
+
+## Files changed
+
+None this turn — design/planning only. The user updated
+`ai/prompt-io/prompts/subints_spawner.md` themselves to
+complete the truncated sentence on line 32 (harness-flag
+reference).
+
+Upcoming (Phase A, next turn):
+- `tractor/spawn/_spawn.py` — trimmed to "core"
+- `tractor/spawn/_trio.py` — new; holds `trio_proc()`
+- `tractor/spawn/_mp.py` — new; holds `mp_proc()`
+- `tractor/spawn/__init__.py` — docstring refresh
+- `tractor/_testing/pytest.py` — backend tuple from
+  `get_args(SpawnMethodKey)`
+
+## Human edits
+
+None — committed as generated. User completed the
+truncated sentence on line 32 of
+`ai/prompt-io/prompts/subints_spawner.md` themselves
+*before* this prompt-io log was written; that edit was
+the user's authoring, not an edit to AI output.

ai/prompt-io/claude/20260417T034918Z_9703210_prompt_io.raw.md

@@ -0,0 +1,117 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-17T03:49:18Z
+git_ref: 9703210
+diff_cmd: git diff HEAD~1..HEAD
+---
+
+No code was produced in this turn — this is a design/planning
+exchange for subint spawner support per issue #379. Captured
+verbatim below are the two substantive AI responses, which
+together fix the phased plan (A: modularize, B: subint, C:
+harness) and the concrete Phase A file split before any
+implementation begins.
+
+## Turn 1 — initial triage + gating questions
+
+> Read: issue #379, current `spawn/_spawn.py` (847 lines),
+> and pyproject pins.
+>
+> ## Task summary
+> Design/plan/implement subint backend per #379, plus
+> modularize `spawn/_spawn.py` into per-backend submods, plus
+> harness flag for test parametrization.
+>
+> ## Key finding
+> `pyproject.toml:12` pins `requires-python = ">=3.12, <3.14"`
+> — but `concurrent.interpreters` / PEP 734 **only lands in
+> 3.14**. This is the load-bearing design question before
+> coding.
+>
+> ## Proposed phasing (incremental commits)
+> - **Phase A — modularize** `_spawn.py`: extract `trio_proc`
+>   → `spawn/_trio.py`, `mp_proc` → `spawn/_mp.py`, keep
+>   generic helpers (`hard_kill`/`soft_kill`/`new_proc`
+>   dispatcher/`SpawnMethodKey`) in a slim core. Tests green
+>   at each step.
+> - **Phase B — `_subint` backend**: extend `SpawnMethodKey`
+>   with `'subint'`; reuse UDS transport by default; shm is
+>   escape-hatch follow-up.
+> - **Phase C — harness**: add backend-parametrize flag, skip
+>   subint when Python < 3.14.
+>
+> ## Gating questions before I start
+> 1. **Python pin**: bump `<3.15` and feature-gate subint
+>    tests (a), require 3.14 outright (b), or backport shim
+>    (c)? I'd recommend (a).
+> 2. **PR strategy**: one branch, commits per phase (current
+>    `claude_bun_opus4.7_subint_spawner_backend`)? Or split
+>    Phase A as its own PR first?
+> 3. **`fork()`-via-subint hack** from the issue's "Our own
+>    thoughts" section — v1 or follow-up? I'd defer to
+>    follow-up.
+> 4. **Prompt file line 32 is truncated** — what's the
+>    existing harness flag name you had in mind ("using the
+>    existing ___")?
+>
+> Which of these are already decided vs. open?
+
+## User answers (for the raw record)
+
+1. bump `<3.15`, feature-gate — option (a).
+2. split Phase A as its own PR first.
+3. defer `fork()`-via-subint hack.
+4. harness flag is `--spawn-backend` CLI → `start_method`
+   fixture, per `tractor._testing._pytest`. Prompt file
+   updated accordingly.
+
+## Turn 2 — concrete Phase A plan
+
+> Good — prompt file now ends cleanly; harness flag
+> confirmed as `--spawn-backend` CLI → `start_method`
+> fixture (via `_testing/pytest.py:193,355`). Also noted
+> `pytest.py:345-349` hardcodes valid backends as a string
+> tuple — `typing.get_args(SpawnMethodKey)` should drive
+> that list.
+>
+> ## Phase A — concrete plan (separate PR)
+>
+> **File split** in `tractor/spawn/`:
+> - `_spawn.py` stays as "core": keeps `SpawnMethodKey`,
+>   `_spawn_method`, `proc_waiter`, `try_set_start_method`,
+>   `exhaust_portal`, `cancel_on_completion`, `hard_kill`,
+>   `soft_kill`, `new_proc` dispatcher, `_methods`
+>   registry. Kept at this path so `_testing/pytest.py:228`
+>   and other external imports don't break.
+> - `_trio.py` ← `trio_proc()` (lines 448–671, ~224 lines)
+> - `_mp.py` ← `mp_proc()` (lines 672–842, ~171 lines)
+> - `_methods` dict imports the two backend fns from the
+>   new modules.
+>
+> **Commits** (each green via `/run-tests`):
+> 1. Drive `_testing/pytest.py` backend-tuple from
+>    `get_args(SpawnMethodKey)` — tiny prep.
+> 2. Extract `trio_proc` → `spawn/_trio.py`; `_methods`
+>    imports it.
+> 3. Extract `mp_proc` → `spawn/_mp.py`; `_methods`
+>    imports it.
+> 4. Tidy `spawn/__init__.py` docstring to describe new
+>    layout.
+>
+> No pyproject pin bump in Phase A (that's Phase B).
+>
+> **Workflow**: I'd run this in a new worktree via
+> `/open-wkt spawn_modularize` (branch
+> `wkt/spawn_modularize`), then open a PR before returning
+> to the current `claude_bun_opus4.7_subint_spawner_backend`
+> branch for Phase B/C.
+>
+> Green-light to `/open-wkt` and start Phase A?
+
+## User final response
+
+> all this first then yes, green light.
+
+— log this `/prompt-io` entry first, then proceed with
+Phase A in a worktree.

ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.md

@@ -0,0 +1,86 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: subints-spawner-phase-a-impl
+timestamp: 2026-04-17T03:58:05Z
+git_ref: 61a73ba
+scope: code
+substantive: true
+raw_file: 20260417T035800Z_61a73ba_prompt_io.raw.md
+---
+
+## Prompt
+
+Follow-up from the design session logged in
+`20260417T034918Z_9703210_prompt_io.md`: the user
+greenlit Phase A after `/prompt-io` tracking, so
+execute the Phase A "modularize `spawn._spawn`" plan
+end-to-end in a new worktree — four logical steps
+(pytest harness prep, `trio_proc` extraction,
+`mp_proc` extraction, docstring refresh), each green
+via `/run-tests`.
+
+User directives during execution:
+- **Option 3** for the test cadence ("continue A.2–A.4
+  first, then run the full suite once at the end of
+  Phase A").
+- **One commit** for the whole phase ("can't we just
+  commit the whole patch in one commit?") instead of
+  the 3/4-commit split I initially proposed.
+- **Don't pre-draft** commit messages — wait for the
+  user to invoke `/commit-msg` (captured as feedback
+  memory `feedback_no_auto_draft_commit_msgs.md`).
+
+## Response summary
+
+Produced the cohesive Phase A modularization patch,
+landed as commit `61a73bae` (subject: `Mv
+trio_proc`/`mp_proc` to per-backend submods`). Five
+files changed, +565 / -418 lines.
+
+Key pieces of the patch (generated by claude,
+reviewed by the human before commit):
+- `tractor/spawn/_trio.py` — **new**; receives
+  `trio_proc()` verbatim from `_spawn.py`; imports
+  cross-backend helpers back from `._spawn`.
+- `tractor/spawn/_mp.py` — **new**; receives
+  `mp_proc()` verbatim; uses `from . import _spawn`
+  for late-binding access to the mutable `_ctx` /
+  `_spawn_method` globals (design decision made
+  during impl, not the original plan).
+- `tractor/spawn/_spawn.py` — shrunk 847 → 448 LOC;
+  import pruning; bottom-of-module late imports for
+  `trio_proc` / `mp_proc` with a one-line comment
+  explaining the circular-dep reason.
+- `tractor/spawn/__init__.py` — docstring refresh
+  describing the new layout.
+- `tractor/_testing/pytest.py` — the valid-backend
+  set now comes from `typing.get_args(SpawnMethodKey)`
+  so future additions (`'subint'`) don't need harness
+  edits.
+
+## Files changed
+
+See `git diff 61a73ba~1..61a73ba --stat`:
+
+```
+ tractor/_testing/pytest.py |  12 +-
+ tractor/spawn/__init__.py  |  31 +++-
+ tractor/spawn/_mp.py       | 235 ++++++++++++++++++++++++
+ tractor/spawn/_spawn.py    | 413 +-------------------------------
+ tractor/spawn/_trio.py     | 292 ++++++++++++++++++++++++++++
+ 5 files changed, 565 insertions(+), 418 deletions(-)
+```
+
+Validation:
+- import probe + `_methods` wiring check — OK
+- spawn-relevant test subset — 37 passed, 1 skipped
+- full suite — 350 passed, 14 skipped, 7 xfailed, 1
+  xpassed
+
+## Human edits
+
+None — committed as generated by claude (no diff
+between `.claude/git_commit_msg_LATEST.md` and the
+committed body, as far as the assistant could
+observe).

ai/prompt-io/claude/20260417T035800Z_61a73ba_prompt_io.raw.md

@@ -0,0 +1,138 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-04-17T03:58:05Z
+git_ref: 61a73ba
+diff_cmd: git diff 61a73ba~1..61a73ba
+---
+
+Code generated in this turn was committed verbatim as
+`61a73bae` ("Mv `trio_proc`/`mp_proc` to per-backend
+submods"). Per diff-ref mode, per-file code is captured
+via the pointers below, each followed by a prose
+summary of what the AI generated. Non-code output
+(sanity-check results, design rationale) is included
+verbatim.
+
+## Per-file generated content
+
+### `tractor/spawn/_trio.py` (new, 292 lines)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/_trio.py`
+
+Pure lift-and-shift of `trio_proc()` out of
+`tractor/spawn/_spawn.py` (previously lines 448–670).
+Added AGPL header + module docstring describing the
+backend; imports include local `from ._spawn import
+cancel_on_completion, hard_kill, soft_kill` which
+creates the bottom-of-module late-import pattern in
+the core file to avoid a cycle. All call sites,
+log-format strings, and body logic are byte-identical
+to the originals — no semantic change.
+
+### `tractor/spawn/_mp.py` (new, 235 lines)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/_mp.py`
+
+Pure lift-and-shift of `mp_proc()` out of
+`tractor/spawn/_spawn.py` (previously lines 672–842).
+Same AGPL header convention. Key difference from
+`_trio.py`: uses `from . import _spawn` (module
+import, not from-import) for `_ctx` and
+`_spawn_method` references — these are mutated at
+runtime by `try_set_start_method()`, so late binding
+via `_spawn._ctx` / `_spawn._spawn_method` is required
+for correctness. Also imports `cancel_on_completion`,
+`soft_kill`, `proc_waiter` from `._spawn`.
+
+### `tractor/spawn/_spawn.py` (modified, 847 → 448 LOC)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/_spawn.py`
+
+- removed `trio_proc()` body (moved to `_trio.py`)
+- removed `mp_proc()` body (moved to `_mp.py`)
+- pruned imports now unused in core: `sys`,
+  `is_root_process`, `current_actor`,
+  `is_main_process`, `_mp_main`, `ActorFailure`,
+  `pretty_struct`, `_pformat`
+- added bottom-of-file late imports
+  `from ._trio import trio_proc` and
+  `from ._mp import mp_proc` with a one-line
+  comment explaining why (circular dep)
+- `_methods` dict unchanged structurally; still binds
+  `'trio' → trio_proc`, `'mp_spawn' → mp_proc`,
+  `'mp_forkserver' → mp_proc`
+
+### `tractor/spawn/__init__.py` (modified)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/spawn/__init__.py`
+
+Docstring rewrite only — no code. New text describes
+the per-backend `Layout` with `- ._spawn` (core),
+`- ._trio` (default), `- ._mp` (two mp variants), and
+reiterates the "no eager import" NOTE.
+
+### `tractor/_testing/pytest.py` (modified)
+
+> `git diff 61a73ba~1..61a73ba -- tractor/_testing/pytest.py`
+
+Two-line logical change (plus a comment):
+- `from typing import` grows `get_args`
+- `pytest_generate_tests()` replaces the hardcoded
+  `('mp_spawn','mp_forkserver','trio')` tuple with
+  `get_args(SpawnMethodKey)` via lazy import
+  `from tractor.spawn._spawn import SpawnMethodKey`
+  inside the function body (matching the project's
+  existing lazy-import convention for the spawn
+  module)
+
+## Non-code output (verbatim)
+
+### Design rationale for the file split
+
+From my Phase A plan turn (already captured in
+`20260417T034918Z_9703210_prompt_io.md`):
+- `_spawn.py` stays as the "core" rather than renamed
+  to `_core.py` so external imports
+  (`_testing/pytest.py:228` imports
+  `try_set_start_method` from `tractor.spawn._spawn`)
+  keep working without churn.
+- Per-backend extraction chosen over alternatives
+  (e.g. splitting generic helpers further) because
+  the immediate motivation is hosting a 3rd
+  `_subint.py` sibling cleanly in Phase B.
+
+### Sanity-check output (verbatim terminal excerpts)
+
+Post-extraction import probe:
+```
+extraction OK
+_methods: {'trio': 'tractor.spawn._trio.trio_proc',
+           'mp_spawn': 'tractor.spawn._mp.mp_proc',
+           'mp_forkserver': 'tractor.spawn._mp.mp_proc'}
+```
+
+Spawn-relevant test subset (`tests/test_local.py
+test_rpc.py test_spawning.py test_multi_program.py
+test_discovery.py`):
+```
+37 passed, 1 skipped, 14 warnings in 55.37s
+```
+
+Full suite:
+```
+350 passed, 14 skipped, 7 xfailed, 1 xpassed,
+151 warnings in 437.73s (0:07:17)
+```
+
+No regressions vs. `main`. One transient `-x`
+early-stop `ERROR` on
+`test_close_channel_explicit_remote_registrar[trio-True]`
+was flaky (passed solo, passed without `-x`), not
+caused by this refactor.
+
+### Commit message
+
+Also AI-drafted (via `/commit-msg`) — the 40-line
+message on commit `61a73bae` itself. Not reproduced
+here; see `git log -1 61a73bae`.

ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.md

@@ -0,0 +1,146 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+session: trio-0.33-subproc-supervisor-retroactive
+timestamp: 2026-06-01T23:14:29Z
+git_ref: 0e3e008b
+scope: code
+substantive: true
+raw_file: 20260601T231429Z_0e3e008b_prompt_io.raw.md
+---
+
+## Prompt
+
+**RETROACTIVE LOG** — original session prompts not
+preserved; reconstructed from the staged work product.
+
+The work designs a `trio.Nursery.start()`-style wrapper
+around `trio.run_process()` for SC-friendly subprocess
+supervision. From the resulting code shape, the
+prompting intent was:
+
+1. Surface rc!=0 `CalledProcessError` DETERMINISTICALLY,
+   without the nursery-eg-wrapping that complicates
+   `collapse_eg()` usage and races the relay reader on
+   trio's `check=True`-driven cancel cascade.
+2. ALWAYS isolate the parent controlling-tty so a
+   spawned child can't emit terminal control-seqs onto
+   the launching tty (clobbering scrollback). Default
+   `stdin=DEVNULL`; default `stdout=DEVNULL` unless
+   explicitly relayed/overridden; distinguish "caller
+   passed nothing" from "caller passed `None` for
+   inherit".
+3. Optional live per-line relay of child std-streams to
+   the `tractor` log — STREAMED (not
+   buffered-until-exit) so long-lived daemon output is
+   visible during the run. Pick a custom log level that
+   shows at usual `info`/`devx` console levels but is
+   separately filterable.
+4. Concurrent pipe-drain reader MANDATORY when piping
+   without `capture_*` — without it the child blocks on
+   `write()` once the OS pipe buffer fills (~64KiB),
+   causing deadlocks on output bursts.
+5. Non-blocking `tn.start()` semantics: hand the live
+   `trio.Process` to the parent immediately;
+   supervise/relay run to completion in the supervisor
+   coro.
+6. Hermetic `trio`-only unit tests (no actor-runtime)
+   covering each of: per-line relay, tty isolation,
+   no-deadlock on >64KiB unnewlined output, CPE
+   rebuild w/ stderr relay, CPE rebuild on the silent
+   drain+capture path.
+
+## Response summary
+
+Adds `tractor/trionics/_subproc.py` (296 LOC) +
+`tests/trionics/test_subproc.py` (230 LOC) + a
+re-export in `tractor/trionics/__init__.py`.
+
+**`supervise_run_process()`** (public, re-exported)
+- `check=False` is forced to `trio.run_process`; the
+  rc-check runs in the supervisor coro AFTER `own_tn`
+  unwinds (both the child AND the relay readers have
+  hit EOF + fully drained). A BARE
+  `subprocess.CalledProcessError` is rebuilt + raised
+  from there, with `.stderr` bytes passed in the
+  constructor AND attached as an `add_note()`'d
+  `|_.stderr:` block for legible teardown logs.
+- `stdin=DEVNULL` always. `stdout` default chosen via a
+  `_UNSET` sentinel: `relay_stdout=True` → PIPE,
+  explicit `stdout=...` → as given, else `DEVNULL`.
+  `stderr` defaults to PIPE whenever we relay OR need
+  the CPE note (when `check=True`), else `DEVNULL`.
+- `relay_level='io'` (custom level 21; sorts just
+  above stdlib `INFO`=20 so it shows at usual
+  `info`/`devx` levels and stays separately
+  filterable). `runtime`=15 would silently filter at
+  default levels, so it's rejected as a default.
+- `task_status.started(trio_proc)` delivers the live
+  process immediately. The internal `own_tn`
+  supervises `trio.run_process` + any relay readers to
+  completion.
+- `**run_process_kwargs` forward verbatim;
+  `stdin/stdout/stderr/check` are MANAGED keys
+  (override on conflict).
+- Crash-handling deliberately NOT baked in — compose
+  `maybe_open_crash_handler()` on top at the call-site.
+
+**`_relay_stream_lines()`** (internal helper)
+- Three modes (combinable): `emit`-only (live per-line
+  relay), `accum`-only (silent drain+capture for a CPE
+  note), or both (live relay AND capture).
+- Per-line split handles cross-chunk residuals via a
+  rolling `residual` bytes buffer; flushes any trailing
+  un-newline-term'd line at EOF.
+- `async with stream:` ensures aclose at EOF/cancel
+  (mirrors trio's internal `_subprocess` drain idiom).
+
+**`_add_stderr_note()`** (internal helper)
+- `add_note()`s a `textwrap.indent(...)`'d
+  `|_.stderr:` block onto a `CalledProcessError` for
+  teardown logs.
+
+**Tests** (5 hermetic, trio-only) — `_capture_relay`
+fixture monkeypatches `_subproc.log.<level>` to a list:
+- `test_stdout_relayed_per_line`: per-line stdout
+  relay carries each `line=N` to the records.
+- `test_parent_tty_isolated`: `readlink /proc/self/fd/0`
+  and `fd/1` from the child show `pipe:` (fd1) +
+  `/dev/null` (fd0); NO `/dev/pts/*`.
+- `test_no_deadlock_on_big_unnewlined_output`: 200KiB
+  of `x` with no newlines completes inside
+  `fail_after(2)` — exercises the concurrent drain.
+- `test_stderr_relay_and_cpe_rebuild`: rc=3 with
+  `relay_stderr=True` raises bare CPE
+  (via `collapse_eg()`) with `b'boom' in cpe.stderr`,
+  the note attached, AND per-line live relay.
+- `test_nonrelay_cpe_note`: rc=7 with no relay still
+  produces CPE with `.stderr` + note via the silent
+  drain+capture path.
+
+## Files changed
+
+- `tractor/trionics/_subproc.py` — NEW. Public
+  `supervise_run_process()` + helpers
+  `_relay_stream_lines()` / `_add_stderr_note()` + the
+  `_UNSET` sentinel.
+- `tests/trionics/test_subproc.py` — NEW. 5 hermetic
+  trio-only tests + `_capture_relay` monkeypatch
+  fixture.
+- `tractor/trionics/__init__.py` — re-export
+  `supervise_run_process`.
+
+## Human edits
+
+**RETROACTIVE**: this log is being written from the
+staged diff, not from a live session. The code as
+staged is the canonical artifact; any human edits the
+user made during the originating design session are
+already integrated and cannot be separated post-hoc.
+The `.raw.md` sibling is a diff-pointer placeholder,
+NOT a pre-edit transcript.
+
+Future prompt-io entries for in-flight work should be
+written DURING the design session per the skill
+contract so the pre-edit `.raw.md` captures the
+unedited model output for genuine provenance.

ai/prompt-io/claude/20260601T231429Z_0e3e008b_prompt_io.raw.md

@@ -0,0 +1,106 @@
+---
+model: claude-opus-4-7[1m]
+service: claude
+timestamp: 2026-06-01T23:14:29Z
+git_ref: 0e3e008b
+diff_cmd: git diff HEAD~1..HEAD
+---
+
+# RETROACTIVE — original model output not preserved
+
+This `.raw.md` would normally contain the verbatim
+pre-human-edit response from the design session that
+produced the staged `_subproc.py` module + tests. That
+session's transcript is not available, so this file
+serves as a diff-pointer placeholder + transparency
+note.
+
+## Authoritative artifact
+
+The committed code IS the artifact of record. Once the
+companion commit lands, the unified diff is:
+
+> `git diff HEAD~1..HEAD -- tractor/trionics/_subproc.py`
+> `git diff HEAD~1..HEAD -- tests/trionics/test_subproc.py`
+> `git diff HEAD~1..HEAD -- tractor/trionics/__init__.py`
+
+Before committing, substitute `--cached` for the
+pre-commit form.
+
+## What is NOT here
+
+Because this is retroactive:
+- No verbatim chain-of-thought / discussion prose from
+  the design session.
+- No rejected alternatives the model considered before
+  arriving at the final shape (e.g. whether the
+  rc-check should live inside `own_tn` vs after it; the
+  `_UNSET` sentinel vs a `None`-means-DEVNULL
+  convention; `io` vs `info` as the default relay
+  level).
+- No pre-edit code blocks as the model first emitted
+  them, separable from any user cleanup applied before
+  the diff was staged.
+
+## Inferred design choices visible in the final code
+
+(Documented here because they're the kind of decision
+detail an unedited raw transcript would have captured.)
+
+1. **Post-drain rc-check in the supervisor coro body,
+   AFTER `own_tn.__aexit__`.** Placing the
+   `CalledProcessError` raise here (not inside
+   `own_tn`) means the EG-unwrap happens at the OUTER
+   `tn.start()` boundary — callers do `collapse_eg()`
+   if they want bare. Doing the raise INSIDE `own_tn`
+   would cancel the still-draining relay reader
+   mid-flight and lose stderr lines.
+
+2. **`_UNSET` sentinel for `stdout`.** A plain default
+   of `None` couldn't distinguish "use the safe
+   `DEVNULL` default" from "caller explicitly passed
+   `None` (inherit, presumably knowingly)". The
+   sentinel keeps the SAFE default while letting power
+   users opt into inherit.
+
+3. **`relay_level='io'` (custom level 21).** Chosen to
+   sort just above stdlib `INFO`=20 so a default
+   `--ll info` shows the relay, but it remains a
+   distinct level so users can filter
+   `tractor.trionics:io` separately. Picking
+   `runtime`=15 would have made the relay invisible at
+   default verbosity (a footgun for daemon supervisors
+   whose whole point is "I want to see this output").
+
+4. **Reader is MANDATORY, not opt-in cosmetic.** With
+   `stdout=PIPE` / `stderr=PIPE` we OWN the drain
+   responsibility — there's no `trio.capture_*` running
+   under the hood here. The ~64KiB OS pipe buffer
+   means a child writing more than that without us
+   reading hangs at `write()` — a deadlock that won't
+   show up in small-output tests, which is why the
+   200KiB-no-newline test is in the suite.
+
+5. **`task_status.started(trio_proc)` BEFORE the
+   `own_tn` exits.** Without this, `tn.start()` would
+   block until the child exits — losing the "start a
+   long-lived daemon and continue with parent work"
+   use case. With it, the parent gets the live process
+   handle immediately and the supervise+relay tasks
+   run in the supervisor coro until the child exits.
+
+6. **`__notes__` via `add_note()` for the CPE
+   `.stderr`.** The `.stderr` attribute is what
+   `subprocess` callers expect; the `add_note()` is
+   what trio's exception-rendering shows. Both wired so
+   programmatic AND human consumers see the stderr at
+   teardown.
+
+## Honesty statement
+
+This file's content is RECONSTRUCTED from the staged
+code, not extracted from a verbatim model transcript.
+The prompt-io skill's intent is for the `.raw.md` to
+be a pre-edit fossil; that's not possible here. Future
+work should write the prompt-io entry DURING the
+design session.

ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.md

@@ -0,0 +1,93 @@
+---
+model: claude-fable-5[1m]
+service: claude
+session: 0780a862-e19a-4f0a-86cd-c8afc0997757
+timestamp: 2026-06-11T17:51:52Z
+git_ref: 8526985c
+scope: docs+code+config
+substantive: true
+raw_file: 20260611T175152Z_8526985c_prompt_io.raw.md
+---
+
+## Prompt
+
+> we need big boi docs; ours are way out of date and generally
+> terrible. i'd like to use a sphinx theme in the vein and/or
+> one-of/nearly-the-same-as used in one or all of the `msgspec`,
+> `numpy`, `ray`, `xonsh`, `polars` projects.
+>
+> see the following oustanding but now very old issues to guide
+> you: #175, #126, #123, #157
+>
+> we should try to target a 3 columned sphinx theme with,
+> - document index-nav on left,
+> - body content in middle,
+> - diagrams (ideally in d2lang if possible) on RHS
+>
+> optimize for (if possible),
+> - reusing examples code without duplication in docs,
+> - generating new examples from todos throughout code base,
+> - distilling the essence of SC across processes in the simplest
+>   and most friendly way possible.
+>
+> do this work in a /open-wkt and do you best without my guidance
+> for the first major pass - we will refine asap once you are
+> complete.
+
+Session settings: `/effort max` + ultracode (multi-agent workflow
+orchestration). Fully autonomous first pass; two orchestrated
+agent fleets were used (6-agent recon survey, then 10-agent
+content fan-out: 9 section writers + 1 examples smith), with the
+orchestrator authoring the landing page, SC essay, sphinx
+scaffold, d2 pipeline + diagram sources, CI workflow and all
+integration/fix passes directly.
+
+## Response summary
+
+Complete sphinx docs revamp on branch `wkt/big_boi_docs`:
+`pydata-sphinx-theme` 0.18 (3-column: left nav / content /
+page-toc, with d2 diagrams + asides floated into the RHS margin
+via custom CSS), sphinx 9.1, a local `.. d2::` directive
+rendering `docs/diagrams/*.d2` sources with committed-SVG
+fallback, a vendored `.. margin::` directive, ~25 new doc pages
+(landing, start/, explain/, 12 guides, 10 api-ref pages,
+project/), 5 new auto-tested examples + 3 modernized + 1
+renamed, and a gh-pages deploy workflow (issue #123). All
+example code is `literalinclude`d from `examples/` (zero
+duplication, CI-verified). Build: green, 24 warnings all
+pre-existing-docstring/NEWS sourced.
+
+## Files changed
+
+See the branch diff (uncommitted at entry-write time):
+
+> `git diff test_cpu_throttling..wkt/big_boi_docs`
+> `git -C <wkt> status --short` (pre-commit working tree)
+
+- `docs/conf.py` — full rewrite for pydata theme + ext stack
+- `docs/_ext/d2diagrams.py` — new `.. d2::` sphinx directive
+- `docs/_ext/marginalia.py` — new `.. margin::` directive
+- `docs/_static/css/custom.css` — b&w skin + RHS margin floats
+- `docs/diagrams/*.d2` (7) — diagram sources (sketch/grayscale)
+- `docs/_diagrams/*.svg` (7) — committed rendered fallbacks
+- `docs/index.rst` — new landing (replaces dead-API doc)
+- `docs/start/*.rst` (3), `docs/explain/*.rst` (3),
+  `docs/guide/*.rst` (13), `docs/api/*.rst` (10),
+  `docs/project/*.rst` (3) — new content tree
+- `docs/dev_tips.rst` — removed (ported to project/dev-tips)
+- `examples/{typed_payloads,nested_actor_tree,
+  service_daemon_discovery,uds_transport_actor_tree,
+  streaming_broadcast_fanout}.py` — new, smoke-tested
+- `examples/{a_trynamic_first_scene,
+  actor_spawning_and_causality,parallelism/single_func}.py` —
+  `.result()` -> `.wait_for_result()` modernization
+- `examples/parallelism/concurrent_futures_primes.py` — renamed
+  from leading-underscore + trio-runner shim added
+- `pyproject.toml` — `docs` dependency-group filled in
+- `uv.lock` — relock for docs group
+- `.github/workflows/docs.yml` — build + gh-pages deploy
+
+## Human edits
+
+None yet — entry written pre-commit; the author reviews, stages
+and commits manually (per repo workflow policy).

ai/prompt-io/claude/20260611T175152Z_8526985c_prompt_io.raw.md

@@ -0,0 +1,49 @@
+---
+model: claude-fable-5[1m]
+service: claude
+timestamp: 2026-06-11T17:51:52Z
+git_ref: 8526985c
+diff_cmd: git diff test_cpu_throttling..wkt/big_boi_docs
+---
+
+# Raw output pointers (diff-ref mode)
+
+All generated content is code/config/docs committed alongside
+this entry on branch `wkt/big_boi_docs`; per the prompt-io
+diff-ref decision rule each file's verbatim content is the diff
+itself rather than a copy here:
+
+> `git diff test_cpu_throttling..wkt/big_boi_docs -- docs/`
+> `git diff test_cpu_throttling..wkt/big_boi_docs -- examples/`
+> `git diff test_cpu_throttling..wkt/big_boi_docs -- pyproject.toml uv.lock .github/`
+
+## Generation notes (non-code output summary)
+
+- Theme research (web, agent-verified 2026-06-11): msgspec=furo,
+  xonsh=furo, numpy/ray/polars=pydata-sphinx-theme (ray migrated
+  off sphinx-book-theme); sphinx-book-theme 1.2.0 hard-pins
+  pydata 0.16.1 (stale) -> chose pydata 0.18 + sphinx 9.1.
+- d2 ecosystem: no production-grade pypi extension exists
+  (sphinxcontrib-d2lang 0.0.5 ignores returncodes, uuid4 output
+  names; sphinx-d2 is an empty stub) -> wrote local
+  `docs/_ext/d2diagrams.py` (~230 LOC) with D2_BIN env
+  discovery, mtime caching, committed-SVG fallback and
+  literal-block last resort.
+- Diagrams authored in d2 (theme-id 1 "Neutral Grey" + sketch
+  mode + ELK layout, validated by render + headless-firefox
+  screenshot loop): actor_tree, context_handshake (real
+  msg-spec names Start/StartAck/Started/Yield/Stop/Return),
+  streaming_pipeline, runtime_stack, debug_lock,
+  error_propagation, infected_aio.
+- API truth enforced from a 6-agent recon pass over the
+  reorganized package tree (runtime/, discovery/, spawn/, ipc/,
+  msg/, devx/, trionics/): docs teach `.wait_for_result()`,
+  registrar (not arbiter) naming, `@tractor.context` +
+  `open_context()` as the core model, `run_in_actor()` as
+  convenience only.
+- All ~30 literalincluded example scripts verified present; 9
+  touched/new example files smoke-run green (exit 0, <16s).
+- Final build: `sphinx-build -b html` succeeded; 24 residual
+  warnings, every one sourced from pre-existing library
+  docstring rst-isms or legacy NEWS.rst content (left untouched
+  by design; flagged for a follow-up docstring lint pass).

ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.md

@@ -0,0 +1,65 @@
+---
+model: claude-fable-5[1m]
+service: claude
+session: 638d5a98-abd2-4217-a447-19f2330eb334
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 0a3c48fc
+scope: code
+substantive: true
+raw_file: 20260625T232506Z_0a3c48fc_prompt_io.raw.md
+---
+
+## Prompt
+
+Same `/code-review` follow-up session (PR #460). Finding #10:
+the new `api/` autodoc reference pages surfaced 22 docutils
+warnings sourced from informal reST in public docstrings. The
+user opted to fix it on this branch,
+
+> well we're on a clean main so why not just do these now too?
+
+Goal: drive the docs build warning-free (24 -> 0) without any
+code/behaviour change — docstring content only.
+
+## Response summary
+
+Surgical docstring-RST lint across 9 library modules + the one
+offending `NEWS.rst` changelog entry,
+
+- bullet lists given a blank line + base-column indent
+  (`Context`, `Context.cancel_called`/`.cancelled_caught`/
+  `.outcome`, `ActorNursery.cancel_called`, `query_actor`,
+  `open_crash_handler`, the `#318` `NEWS.rst` entry),
+- the under-short `Behaviour:` underline in `Context.cancel`
+  demoted to a `**bold**` label,
+- unbalanced/pluralized-role backticks fixed — closed the
+  `wait_for_actor` summary backtick; applied the `` `role`\ s ``
+  escaped-plural idiom in `gather_contexts`, `mk_pdb`,
+  `MsgCodec`, msg `Error`, `open_context_from_portal`,
+- the `|_` method-tree in `ContextCancelled.canceller` made a
+  literal block (bare `|` was parsed as a substitution ref).
+
+Verified: build `24 -> 0` warnings; `import tractor` clean under
+`-W error::SyntaxWarning`; the `\ s` idiom renders as e.g.
+"acms" (no backslash/space leak in HTML); `ruff` clean; diff
+confirmed docstring-content-only.
+
+Initial generation was delegated to a constrained subagent
+(docstring-only edits + a rebuild-to-zero verification gate);
+the orchestrator independently re-built, reviewed the full
+diff, and added the `NEWS.rst` fix to reach zero.
+
+## Files changed
+
+- `tractor/_context.py`, `tractor/_exceptions.py`,
+  `tractor/devx/debug/_post_mortem.py`,
+  `tractor/devx/debug/_repl.py`, `tractor/discovery/_api.py`,
+  `tractor/msg/_codec.py`, `tractor/msg/types.py`,
+  `tractor/runtime/_supervise.py`,
+  `tractor/trionics/_mngrs.py` — docstring reST fixes,
+- `NEWS.rst` — blank line before a bullet list in the `#318`
+  entry.
+
+## Human edits
+
+None — committed as generated (`0a3c48fc`).

ai/prompt-io/claude/20260625T232506Z_0a3c48fc_prompt_io.raw.md

@@ -0,0 +1,35 @@
+---
+model: claude-fable-5[1m]
+service: claude
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 0a3c48fc
+diff_cmd: git diff 0a3c48fc~1..0a3c48fc
+---
+
+# Raw output pointers (diff-ref mode)
+
+The generated patch is committed; the verbatim content is the
+diff:
+
+> `git diff 0a3c48fc~1..0a3c48fc`
+
+## Generation notes (non-code, verbatim)
+
+- Pure docstring-content edits; no signatures, logic, or
+  non-docstring lines touched (confirmed via `git diff` review).
+- reST fix patterns applied: blank-line + base-column indent
+  for bullet lists ("Unexpected indentation" / "Definition
+  list ..." / "Block quote ..."); `**bold**` in place of an
+  under-length section underline ("Title underline too short");
+  closing/escaping backticks ("Inline interpreted text ...
+  without end-string"); literal-block for an ASCII tree whose
+  `|` chars tripped "Inline substitution_reference ...".
+- The pluralized-role idiom is written `\\ s` in the Python
+  source (so the runtime docstring holds `` `role`\ s ``); a
+  bare `\ ` would raise a 3.13 invalid-escape SyntaxWarning.
+  Verified clean via `python -W error::SyntaxWarning -c
+  "import tractor"`.
+- Verification gate: `sphinx-build` warning count 24 -> 2
+  (subagent, docstrings only) -> 0 after the orchestrator added
+  the `NEWS.rst` blank-line fix; rendered-HTML spot-check
+  confirmed no literal `\ s` leak; `ruff check` clean.

ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.md

@@ -0,0 +1,64 @@
+---
+model: claude-fable-5[1m]
+service: claude
+session: 638d5a98-abd2-4217-a447-19f2330eb334
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 3a5cfde0
+scope: code
+substantive: true
+raw_file: 20260625T232506Z_3a5cfde0_prompt_io.raw.md
+---
+
+## Prompt
+
+Follow-up to a `/code-review` of PR #460 (this branch) which
+surfaced lower-severity findings in the `.. d2::` sphinx
+directive. The user's driving instructions across the session,
+
+> yup do both *at least*, then report back.
+
+(re: "implement #7 (+ optionally #8) on the branch") and,
+
+> well we're on a clean main so why not just do these now too?
+
+(re: also doing #9). The three findings being addressed,
+
+- #7: a `d2` render that is *attempted and fails* (binary
+  present but errors on the source) silently degraded to the
+  stale committed SVG and the build still exited 0,
+- #8: `parallel_*_safe = True` was declared while `run()`
+  writes the shared output SVG during the read phase (torn
+  write under `sphinx-build -j`),
+- #9: output keyed only by `src.stem` so two `.d2` sources
+  with the same stem collide.
+
+## Response summary
+
+Reworked `docs/_ext/d2diagrams.py`,
+
+- `render_svg()` now returns a `RenderResult` tristate
+  (`OK` / `FELL_BACK` / `NO_OUTPUT` / `FAILED`) so `run()` can
+  distinguish a graceful no-binary fallback from a real render
+  failure; `FAILED` emits a `reporter.error` (build fails under
+  `-W`),
+- the render writes into a sibling temp-file then `os.replace()`
+  (atomic) so a failed/torn render can never clobber a good
+  committed SVG,
+- a per-build `_seen_outputs` map (reset on `builder-inited`)
+  errors on a same-stem output collision.
+
+Verified: a corrupted `.d2` errors under `-W` (exit 1) with the
+committed SVG byte-unchanged; the collision guard fires on a
+duplicate stem; `nix run nixpkgs#d2` render path + atomic swap
+leave no temp residue; `ruff` clean.
+
+## Response summary (cont.) — Files changed
+
+- `docs/_ext/d2diagrams.py` — tristate render result, atomic
+  temp-file render, output-collision guard, doc-string policy
+  update.
+
+## Human edits
+
+None — committed as generated (`3a5cfde0`). The user noted
+follow-up refinements may come in later commits.

ai/prompt-io/claude/20260625T232506Z_3a5cfde0_prompt_io.raw.md

@@ -0,0 +1,35 @@
+---
+model: claude-fable-5[1m]
+service: claude
+timestamp: 2026-06-25T23:25:06Z
+git_ref: 3a5cfde0
+diff_cmd: git diff 3a5cfde0~1..3a5cfde0
+---
+
+# Raw output pointers (diff-ref mode)
+
+The generated patch is committed; per the diff-ref decision
+rule the verbatim content is the diff itself:
+
+> `git diff 3a5cfde0~1..3a5cfde0 -- docs/_ext/d2diagrams.py`
+
+## Generation notes (non-code, verbatim)
+
+- `RenderResult` enum added; `render_svg()` return type changed
+  `bool -> RenderResult`. Mapping in `run()`: `FAILED` ->
+  `state_machine.reporter.error(...)`, `NO_OUTPUT` -> raw `.d2`
+  source as a `literal_block`, `OK`/`FELL_BACK` -> `image`.
+- Atomicity via `tempfile.mkstemp(dir=out.parent, ...)` +
+  `os.replace(tmp, out)`; temp unlinked on any failure path.
+- Collision guard: module-level `_seen_outputs: dict[str,str]`
+  keyed by output basename, cleared by a `builder-inited`
+  handler connected in `setup()`.
+- `parallel_read_safe`/`parallel_write_safe` kept `True` but
+  now justified by the atomic swap (documented inline).
+- Empirical verification performed before commit:
+  - broken `.d2` + `sphinx-build -W` -> exit 1, ERROR node
+    rendered, committed `actor_tree.svg` md5 unchanged,
+  - duplicate-stem orphan page -> "d2 output collision" error,
+  - `nix run nixpkgs#d2` forced re-render -> deterministic
+    (no git drift), no `.tmp` residue,
+  - `ruff check` clean.

ai/prompt-io/claude/20260702T154255Z_65bf9df5_prompt_io.md

@@ -0,0 +1,79 @@
+---
+model: claude-fable-5
+service: claude
+session: f6c84722-471a-4458-9a80-e453fea9029f
+timestamp: 2026-07-02T15:42:55Z
+git_ref: 65bf9df5
+scope: code
+substantive: true
+raw_file: 20260702T154255Z_65bf9df5_prompt_io.raw.md
+---
+
+## Prompt
+
+Driver prompt file `ai/prompt-io/prompts/issue_477.md`:
+
+> attempt to resolve
+> https://github.com/goodboy/tractor/issues/477
+> do it with /open-wkt.
+
+(plus a hard stop-for-human-review deadline of 12:50PM
+EST the same day)
+
+Issue #477 asks to factor `ActorNursery.run_in_actor()`
+(and possibly `Portal.run()`) out of the nursery
+internals into a new `tractor.to_actor` wrapper
+subpackage of "higher level one shot" single-remote-task
+APIs, adopting the `trio.to_thread`/`anyio.to_process`
+parlance, so that error collection/propagation moves up
+into the caller's local `trio` scope and the nursery's
+spawn machinery can eventually drop the
+`._ria_nursery` coupling.
+
+## Response summary
+
+First-cut `tractor.to_actor` subpkg delivering the
+one-shot API composed purely from the existing
+daemon-spawn + portal primitives (`start_actor()` +
+`Portal.run()` + `Portal.cancel_actor()`), leaving the
+legacy `.run_in_actor()` machinery untouched (formal
+deprecation deferred until in-repo usage migrates):
+
+- `to_actor.run(fn, **fn_kwargs) -> Any`: spawn a
+  subactor, schedule `fn` as its lone remote task, wait
+  on and return its result, ALWAYS reaping the subactor
+  (shield-safe `finally`). Remote errors raise in the
+  caller's task as boxed `RemoteActorError`s.
+- placement variants: `portal=` reuses a running actor
+  (no spawn/reap), `an=` spawns from a caller-managed
+  actor-nursery, neither opens a call-scoped private
+  `open_nursery()` (implicitly booting the runtime,
+  configurable via `runtime_kwargs`).
+- fail-fast validation before any spawn: non-streaming
+  async fn required; `portal=`/`an=` mutually
+  exclusive; `runtime_kwargs` rejected alongside any
+  placement opt.
+- `run_in_actor()` TODO/docstring now cross-reference
+  the successor API.
+
+## Files changed
+
+- `tractor/to_actor/__init__.py` — new subpkg,
+  re-exports `run`
+- `tractor/to_actor/_api.py` — `run()` +
+  `_invoke_in_subactor()` + `_validate_one_shot_fn()`
+- `tractor/__init__.py` — top-level `to_actor`
+  re-export
+- `tractor/runtime/_supervise.py` — comment/docstring
+  pointers from `run_in_actor()` to the successor
+- `tests/test_to_actor.py` — 11-test suite covering
+  all placement variants, error relay, the concurrent
+  worker-pool-ish pattern and arg validation
+- `examples/parallelism/to_actor_one_shots.py` —
+  runnable demo (auto-collected by
+  `test_docs_examples.py`)
+
+## Human edits
+
+None yet — pending human review (work paused before the
+12:50PM EST deadline per the driver prompt).

ai/prompt-io/claude/20260702T154255Z_65bf9df5_prompt_io.raw.md

@@ -0,0 +1,100 @@
+---
+model: claude-fable-5
+service: claude
+timestamp: 2026-07-02T15:42:55Z
+git_ref: 65bf9df5
+diff_cmd: git diff main..wkt/to_actor_subpkg
+---
+
+# Raw AI output (diff-ref mode)
+
+All generated code is committed on the
+`wkt/to_actor_subpkg` branch; per diff-ref mode each
+file's verbatim content is reachable via the pointers
+below rather than duplicated here.
+
+## Generated files
+
+> `git diff main..wkt/to_actor_subpkg -- tractor/to_actor/__init__.py`
+
+New subpackage init: module docstring establishing the
+`trio.to_thread`/`anyio.to_process` "run it over there"
+parlance for actors, plus the single public re-export
+`run as run` from `._api`.
+
+> `git diff main..wkt/to_actor_subpkg -- tractor/to_actor/_api.py`
+
+The one-shot invocation impl, composed entirely from the
+lower level daemon-spawn + portal primitives as
+prescribed by issue #477:
+
+- `_validate_one_shot_fn()`: the `Portal.run()`
+  non-streaming-async-fn constraint checked up-front,
+  before any subactor is spawned.
+- `_invoke_in_subactor()`: `an.start_actor()` ->
+  `Portal.run()` -> always-reap via
+  `Portal.cancel_actor()` in a `finally` (the cancel
+  req's bounded wait is internally shielded so the reap
+  also runs under caller-scope cancellation).
+- `run()`: the public API. Placement options:
+  `portal=` (reuse a running actor, no spawn/reap),
+  `an=` (spawn from a caller-managed nursery), or
+  neither (private `open_nursery()` scoped to the call,
+  implicitly booting the runtime when needed, tunable
+  via pass-through `runtime_kwargs`). Spawn opts mirror
+  `ActorNursery.start_actor()`; `**fn_kwargs` are
+  relayed to the remote task. Errors raise in the
+  caller's task as boxed `RemoteActorError`s.
+  `runtime_kwargs` alongside any placement opt is a
+  hard `ValueError`, never silently ignored.
+
+> `git diff main..wkt/to_actor_subpkg -- tractor/__init__.py`
+
+Top-level `from . import to_actor as to_actor`
+re-export.
+
+> `git diff main..wkt/to_actor_subpkg -- tractor/runtime/_supervise.py`
+
+Comment/docstring-only: the `run_in_actor()` deprecation
+TODO now points at the implemented `.to_actor.run()`
+successor (checkbox ticked) and the method docstring
+gains a NOTE steering users to the new API; remaining
+TODO items are the `DeprecationWarning` emission +
+in-repo usage migration.
+
+> `git diff main..wkt/to_actor_subpkg -- tests/test_to_actor.py`
+
+11-test suite: private-nursery one-shot, implicit
+runtime boot via `runtime_kwargs`, remote-error relay to
+the caller's task (bare + caller-managed nursery),
+caller-nursery spawn, portal reuse w/o implicit reap,
+the concurrent worker-pool-ish pattern (local `trio`
+nursery x shared `an`), and the four validation
+rejections (sync fn, async-gen fn, `portal`+`an`
+combo, `runtime_kwargs`+placement combo).
+
+> `git diff main..wkt/to_actor_subpkg -- examples/parallelism/to_actor_one_shots.py`
+
+Runnable example (auto-collected by
+`test_docs_examples.py`): the fully-implicit one-shot
+plus the concurrent worker-pool-ish prime-check pattern
+against a shared caller-managed actor-nursery.
+
+## Test runs (verbatim)
+
+```
+tests/test_to_actor.py ..........                [100%]
+============= 10 passed in 4.29s =============
+```
+
+Regression subset for touched modules
+(`test_local.py test_rpc.py test_spawning.py
+test_cancellation.py`):
+
+```
+38 passed, 1 xfailed, 24 warnings in 80.71s (0:01:20)
+```
+
+(warnings are pre-existing stdlib `os.fork()`
+DeprecationWarnings from the mp spawn backends, not
+introduced by this change)

ai/prompt-io/claude/20260702T165806Z_a34aaf98_prompt_io.md

@@ -0,0 +1,78 @@
+---
+model: claude-fable-5
+service: claude
+session: f6c84722-471a-4458-9a80-e453fea9029f
+timestamp: 2026-07-02T16:58:06Z
+git_ref: a34aaf98
+scope: code
+substantive: true
+raw_file: 20260702T165806Z_a34aaf98_prompt_io.raw.md
+---
+
+## Prompt
+
+Follow-up round in the same session as the
+`tractor.to_actor` landing (see
+`20260702T154255Z_65bf9df5_prompt_io.md`). After
+committing that work the user green-lit the deferred
+items:
+
+> go go go on this with what time you have left, in
+> particular see if you can get the _ria_nursery
+> removal going!
+
+then extended the deadline twice to iterate on the
+discovered hang:
+
+> continue on this up until a 12:58:30 deadline
+
+and finally chose "Commit step A now" from the
+next-steps prompt.
+
+## Response summary
+
+Step A of the `._ria_nursery` removal (issue #477): hoist
+`.run_in_actor()` result-reaping out of the spawn
+backends into the `ActorNursery` machinery so ria
+children spawn via the default daemon nursery,
+
+- new `_supervise._reap_ria_portals()` runs one
+  `_spawn.cancel_on_completion()` task per ria child
+  AFTER `._join_procs` is set; happy path awaits it
+  right after `._join_procs.set()`.
+- error path SEQUENCES: snapshot ria
+  `(portal, subactor)` pairs -> `await an.cancel()` ->
+  0.5s-bounded reap. Two failed intermediates informed
+  this: a concurrent reap+cancel DEADLOCKED
+  `test_multierror`; a 3s bound blew
+  `test_cancel_while_childs_child_in_sync_sleep`'s
+  `fail_after` deadline.
+- backends (`spawn/_trio.py`, `spawn/_mp.py`) lose the
+  `._cancel_after_result_on_exit` membership branch,
+  per-child reaper nursery + dead imports.
+- design/probe-history doc:
+  `ai/conc-anal/ria_nursery_removal_plan.md` (from an
+  agent-verified machinery map).
+
+Verification: `test_cancellation.py` fully green
+(20 passed, 1 xfailed) incl. the previously-hung
+`test_multierror`; `test_to_actor`+`test_spawning`
+20/20; bounded full-suite gate SIGINT'd ~30s early at
+303 passed / 0 failures (user opted to commit on that
+signal, deferring the unbounded re-run to step-B
+verification).
+
+## Files changed
+
+- `tractor/runtime/_supervise.py` — `_reap_ria_portals()`
+  + two call-sites; `run_in_actor()` off the ria nursery
+- `tractor/spawn/_trio.py` — reaper branch + import drop
+- `tractor/spawn/_mp.py` — same as `_trio.py`
+- `ai/conc-anal/ria_nursery_removal_plan.md` — plan +
+  probe history
+
+## Human edits
+
+None yet — committed via the drafted
+`.claude/git_commit_msg_ria_step_a.md` (user-driven
+`git commit --edit`).

ai/prompt-io/claude/20260702T165806Z_a34aaf98_prompt_io.raw.md

@@ -0,0 +1,55 @@
+---
+model: claude-fable-5
+service: claude
+timestamp: 2026-07-02T16:58:06Z
+git_ref: a34aaf98
+diff_cmd: git diff a34aaf98..wkt/to_actor_subpkg
+---
+
+# Raw AI output (diff-ref mode)
+
+Step-A code is committed on `wkt/to_actor_subpkg`
+directly after `a34aaf98`; per diff-ref mode the verbatim
+content is reachable via the pointers below.
+
+## Generated files
+
+> `git diff a34aaf98..wkt/to_actor_subpkg -- tractor/runtime/_supervise.py`
+
+New `_reap_ria_portals(an, errors, ria_children=None)`
+helper (one `_spawn.cancel_on_completion()` task per ria
+child under `collapse_eg()` + a local nursery);
+`run_in_actor()` drops `nursery=self._ria_nursery`; happy
+path awaits the reap right after `._join_procs.set()`;
+inner error handler snapshots ria pairs, runs
+`await an.cancel()` then a `move_on_after(0.5)`-bounded
+reap over the snapshot.
+
+> `git diff a34aaf98..wkt/to_actor_subpkg -- tractor/spawn/_trio.py`
+> `git diff a34aaf98..wkt/to_actor_subpkg -- tractor/spawn/_mp.py`
+
+Both backends: the post-`_join_procs` block collapses to
+a bare `soft_kill()` (membership branch, per-child reaper
+nursery, reaper-cancel logging and the now-unused
+`cancel_on_completion` imports all removed).
+
+> `git diff a34aaf98..wkt/to_actor_subpkg -- ai/conc-anal/ria_nursery_removal_plan.md`
+
+Agent-verified machinery map, 3-step design (A/B/C),
+probe history (deadlock -> sequencing fix -> bound
+tightening) and risk register.
+
+## Test runs (verbatim)
+
+```
+tests/test_cancellation.py: 20 passed, 1 xfailed in 77.28s
+tests/test_to_actor.py + tests/test_spawning.py: 20 passed
+full-suite (SIGINT at 540s bound, ~30s short):
+303 passed, 9 skipped, 1 xfailed, 2 xpassed in 539.42s
+```
+
+Failed intermediates (not in final diff): concurrent
+reap+`an.cancel()` deadlocked `test_multierror`; a 3s
+reap bound blew
+`test_cancel_while_childs_child_in_sync_sleep`'s
+`fail_after` deadline.

ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.md

@@ -0,0 +1,60 @@
+---
+model: claude-opus-4-8
+service: claude
+session: c7860302-6a33-4d92-821c-0807d68be464
+timestamp: 2026-07-02T17:22:33Z
+git_ref: 5cd190c5
+scope: code
+substantive: true
+raw_file: 20260702T172233Z_5cd190c5_prompt_io.raw.md
+---
+
+## Prompt
+
+Branched session (`to_actor_subpkg_POST_WEEKLY_CUTOFF_2OPUS`,
+now on Opus 4.8) continuing the `._ria_nursery` removal after
+step A committed + pushed (`5cd190c5`/`99310269`):
+
+> ok continue where your superior left off please
+
+then, after the commit-split discussion:
+
+> yup committed and pushed so take a look ma fren.
+
+i.e. green-lighting step-B prep against the committed step-A
+tree.
+
+## Response summary
+
+Step B of the `._ria_nursery` removal (issue #477): delete
+the now-vestigial secondary nursery,
+
+- collapse the inner `async with (collapse_eg(),
+  trio.open_nursery() as ria_nursery)` layer in
+  `_open_and_supervise_one_cancels_all_nursery` — `da_nursery`
+  becomes the single nursery for ALL subactors.
+- `ActorNursery.__init__` drops the `ria_nursery` param + the
+  `self._ria_nursery` attr; `start_actor()` drops its
+  `nursery=` escape-hatch param.
+- `._cancel_after_result_on_exit` kept (ria-child
+  discriminator for `_reap_ria_portals()`).
+
+Verified behavior-preserving via a first-principles argument
+(zero-task nursery = a bare checkpoint) + the targeted gate
+(`test_cancellation test_spawning test_local test_rpc
+test_to_actor` = 49 passed, 1 xfailed on trio). The two
+error handlers were deliberately NOT merged — that changes
+propagation semantics and is deferred to its own PR (TODO
+left at the outer `except`).
+
+## Files changed
+
+- `tractor/runtime/_supervise.py` — collapse the ria nursery
+  layer + drop the ctor/`start_actor` params + refresh the
+  now-stale nursery comments
+
+## Human edits
+
+None yet — committed via the drafted
+`.claude/git_commit_msg_ria_step_b.md` (user-driven
+`git commit --edit`).

ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.raw.md

@@ -0,0 +1,51 @@
+---
+model: claude-opus-4-8
+service: claude
+timestamp: 2026-07-02T17:22:33Z
+git_ref: 5cd190c5
+diff_cmd: git diff 5cd190c5..wkt/to_actor_subpkg
+---
+
+# Raw AI output (diff-ref mode)
+
+Step-B code lives on `wkt/to_actor_subpkg` after `5cd190c5`;
+per diff-ref mode the verbatim content is reachable via the
+pointer below.
+
+## Generated files
+
+> `git diff 5cd190c5..wkt/to_actor_subpkg -- tractor/runtime/_supervise.py`
+
+- `ActorNursery.__init__`: `ria_nursery` param removed;
+  `self._ria_nursery = ria_nursery` block deleted;
+  `_cancel_after_result_on_exit` comment refreshed.
+- `start_actor()`: `nursery=` param removed; body uses
+  `self._da_nursery.start(...)` directly.
+- `_open_and_supervise_one_cancels_all_nursery()`: the inner
+  `async with (collapse_eg(), trio.open_nursery() as
+  ria_nursery)` layer removed; `an = ActorNursery(actor,
+  da_nursery, errors)` constructed once under the single
+  `da_nursery`; the inner-try body de-indented one level;
+  both error handlers retained; the da-nursery lead comment
+  and the outer-`except` TODO refreshed to describe the
+  single-nursery reality + flag the (deferred) handler-merge.
+
+> `git diff 5cd190c5..wkt/to_actor_subpkg -- ai/conc-anal/ria_nursery_removal_plan.md`
+
+Added a "Step-B outcome" section (collapse rationale,
+handler-merge deferral, safety argument, gate result).
+
+## Test runs (verbatim)
+
+```
+targeted gate (trio):
+tests/test_cancellation.py tests/test_spawning.py
+tests/test_local.py tests/test_rpc.py tests/test_to_actor.py
+-> 49 passed, 1 xfailed in 88.62s
+
+signature checks:
+ActorNursery.__init__ params: ['self', 'actor', 'da_nursery', 'errors']
+start_actor has nursery param: False
+
+full-suite gate: in progress (see stepB_full.log)
+```

ai/prompt-io/claude/20260702T222544Z_9201a2ed_prompt_io.md

@@ -0,0 +1,68 @@
+---
+model: claude-opus-4-8
+service: claude
+session: c7860302-6a33-4d92-821c-0807d68be464
+timestamp: 2026-07-02T22:25:44Z
+git_ref: 9201a2ed
+scope: code
+substantive: true
+raw_file: 20260702T222544Z_9201a2ed_prompt_io.raw.md
+---
+
+## Prompt
+
+Continuing on branch `drop_ria_nursery` after step B
+(`9201a2ed`). User green-lit the deferred error-handler merge:
+
+> yes, i checked us out on a new branch for the ria-tn removal;
+> work off the new wkt branch drop_ria_nursery.
+
+and (re the migration) "nope, later we'll do this", plus:
+
+> do ensure the test suite is green in the current state and
+> those going forward ya?
+
+and the standing reminder: no commits without a human ack.
+
+## Response summary
+
+Step B2 of the `._ria_nursery` removal (issue #477): merge the
+two nested error handlers in
+`_open_and_supervise_one_cancels_all_nursery` into one, now
+that the 2ndary nursery (whose `__aexit__` the outer handler
+originally guarded) is gone.
+
+Trace-driven justification (see
+`ai/conc-anal/ria_nursery_removal_plan.md` Step-B2 section):
+the old inner handler records `errors[uid]` as its FIRST
+action, so `errors` is always non-empty by the time control
+could reach the outer handler — making the outer handler's
+`raise` DEAD (always superseded by the `finally`'s
+raise-from-`errors`). Collapsing to a single
+`except BaseException as _scope_err` + the existing `finally`
+is therefore behavior-preserving.
+
+- removed the outer `try` + the
+  `except (Exception, BaseExceptionGroup, trio.Cancelled)`
+  handler; de-indented the inner handler one level.
+- dropped the now-unused `outer_err`/`inner_err` locals
+  (single `_scope_err`).
+- net ~30 lines lighter.
+
+Gated hard: baseline (pre-B2 tip) = 300 passed + 1
+load-induced `TooSlowError` flake (passes 6/6 in isolation);
+B2 error/cancel gate (`test_cancellation remote_exc_relay
+inter_peer_cancellation advanced_faults oob_cancellation
+to_actor spawning local rpc`) = 71 passed, 1 xfailed; B2
+full-suite run following.
+
+## Files changed
+
+- `tractor/runtime/_supervise.py` — collapse the two handlers
+  into one; drop `outer_err`/`inner_err`
+
+## Human edits
+
+None yet — committed via the drafted
+`.claude/git_commit_msg_ria_b2.md` (user-driven
+`git commit --edit`).

ai/prompt-io/claude/20260702T222544Z_9201a2ed_prompt_io.raw.md

@@ -0,0 +1,55 @@
+---
+model: claude-opus-4-8
+service: claude
+timestamp: 2026-07-02T22:25:44Z
+git_ref: 9201a2ed
+diff_cmd: git diff 9201a2ed..drop_ria_nursery
+---
+
+# Raw AI output (diff-ref mode)
+
+Step-B2 code lives on `drop_ria_nursery` after `9201a2ed`; per
+diff-ref mode the verbatim content is reachable via the pointer
+below.
+
+## Generated files
+
+> `git diff 9201a2ed..drop_ria_nursery -- tractor/runtime/_supervise.py`
+
+`_open_and_supervise_one_cancels_all_nursery`:
+- removed the outer `try:` wrapper and the
+  `except (Exception, BaseExceptionGroup, trio.Cancelled) as
+  _outer_err:` safety-net handler.
+- the former inner `except BaseException` is now THE handler,
+  renamed local `_inner_err` -> `_scope_err`, de-indented one
+  level; it sets `an._scope_error`, records `errors[uid]`,
+  waits on the debugger, `_join_procs.set()`, then a shielded
+  classify/log + snapshot-ria + `an.cancel()` + 0.5s-bounded
+  `_reap_ria_portals()`. No re-raise (the `finally` raises
+  from `errors`).
+- `finally` block unchanged.
+- dropped the `outer_err`/`inner_err` local decls at fn top.
+
+(The diff is large — ~119+/149- — because de-indenting the
+handler body one level rewrites every line in the block; the
+logic delta is just "two handlers -> one".)
+
+## Test runs (verbatim)
+
+```
+baseline (pre-B2, step-B tip 9201a2ed), full suite
+(dynamic_pub_sub deselected):
+1 failed, 300 passed, 9 skipped, 2 deselected, 1 xfailed,
+2 xpassed in 1499.49s
+  -> the 1 failure = test_ext_types_over_ipc[...] trio.TooSlowError
+     (load-induced; passes 6/6 in isolation in 4.89s)
+
+B2 error/cancel gate:
+tests/test_cancellation test_remote_exc_relay
+test_inter_peer_cancellation test_advanced_faults
+test_oob_cancellation test_to_actor test_spawning test_local
+test_rpc
+-> 71 passed, 1 xfailed in 125.26s
+
+B2 full-suite run: see b2_full.log
+```

ai/prompt-io/claude/20260706T172818Z_ad42871e_prompt_io.md

@@ -0,0 +1,81 @@
+---
+model: claude-fable-5
+service: claude
+session: 6db64ac6-6986-4505-9343-df4ee31e67db
+timestamp: 2026-07-06T17:28:18Z
+git_ref: ad42871e
+scope: code
+substantive: true
+raw_file: 20260706T172818Z_ad42871e_prompt_io.raw.md
+---
+
+## Prompt
+
+Resuming the `drop_ria_nursery` (wkt) branch after the human's
+review pause at `ba4af0ad`, with the directive:
+
+> we need to resolve the remaining outstandings ... to finish
+> this endeavour we ideally,
+> - finish the ria-tn hoist into the machinery in `to_actor` if
+>   possible.
+> - avoid supporting the `.run_in_actor()` non-blocking API
+>   going forward other then if we can re-wrap `to_actor.run()`
+>   per prior discussion with opus4.8.
+> - get the test harness completely green locally and in CI -
+>   AND ESPECIALLY without any hangs due to the "the old
+>   spawn-backend reaper raced `soft_kill()`'s scope-cancel"
+> - update all docs to reflect these changes once we're happy.
+
+plus mid-flight additions:
+
+> make sure both all the test and example code uses the naming
+> `an: ActorNursery` for variable names
+
+> where we at in terms of a potential hackaround design for
+> supporting a to_actor.run_async() ... without requiring the
+> same malarky ... with a `trio.Event` relay ... i'm totes fine
+> with rejigging the iface to NOT return a Portal as well.
+
+## Response summary
+
+Completed the entire #477 `run_in_actor` removal on
+`drop_ria_nursery` (16 commits this session), gated per-commit:
+
+- ported the remaining `test_cancellation` groups
+  (`some_cancels_all`, `nested_multierrors`+`spawn_and_error`,
+  SIGINT + sync-sleep) — one-shots become concurrent
+  `to_actor.run()` tasks in local task-nurseries; BEG-shape
+  assertions loosened for cancel-on-first + the runtime's
+  `collapse_eg()` single-member unwrap (a fully-raced nested
+  tree relays a bare annotated `RemoteActorError` chain).
+- fixed a pre-existing `UnboundLocalError` (`timeout` `match`
+  had no default arm for non-trio/MTF backends).
+- ported `test_dynamic_pub_sub`, 4 non-debugging examples, all
+  8 `debugging/` examples (debugger suite byte-identical,
+  28p/6s; `multi_subactors` introduces the "collect don't
+  cancel" reap-all replacement pattern), 8 docs pages + the
+  `experimental/_pubsub` docstring.
+- EXCISED the API + cluster: `run_in_actor`,
+  `_reap_ria_portals`, `_cancel_after_result_on_exit`,
+  `Portal._submit_for_result/_expect_result_ctx/
+  wait_for_result/result`, `exhaust_portal`,
+  `cancel_on_completion`, `NoResult` — net -402 lines. The
+  reap-hang class dissolves structurally (result-waits now only
+  in caller task-scope).
+- found + fixed a real migration race: mutual-rendezvous peers
+  (`test_trynamic_trio`, `a_trynamic_first_scene.py`) flaked
+  because an eagerly-reaped one-shot dies while its peer still
+  dials the registry-resolved (dead) sockaddr — such peers now
+  pin lifetimes via `start_actor()` + concurrent `Portal.run()`
+  + explicit `an.cancel()`.
+- `an: ActorNursery` naming sweep across tests/examples (±82
+  lines, scoped renames, prose untouched).
+- parked a `to_actor.open_one_shot()` design sketch (acm +
+  private task-nursery over blocking `run()`; done-Event as
+  memo not cancel-relay; no Portal) in the plan doc.
+
+## Files changed
+
+See commits `d01a2123..ad42871e` on `drop_ria_nursery`
+(tests, examples, docs, `tractor/{runtime,spawn,to_actor,msg}`
++ `_exceptions/_context/experimental`).

ai/prompt-io/claude/20260706T172818Z_ad42871e_prompt_io.raw.md

@@ -0,0 +1,39 @@
+---
+model: claude-fable-5
+service: claude
+timestamp: 2026-07-06T17:28:18Z
+git_ref: ad42871e
+diff_cmd: git diff ba4af0ad..ad42871e
+---
+
+# Raw AI output (diff-ref mode)
+
+This session's output spans the 16 migration/excision commits
+`d01a2123..ad42871e` on `drop_ria_nursery`; per diff-ref mode
+the verbatim content is reachable via the pointer below.
+
+## Generated files
+
+> `git diff ba4af0ad..ad42871e`
+
+Commit-wise (each `Gate:`-footed msg documents its own module
+gate):
+
+- `d01a2123` port `test_some_cancels_all`
+- `697c6152` fix unbound `timeout` (non-trio/MTF `match` arm)
+- `fa8799d5` port `test_nested_multierrors`
+- `f11754ce` port SIGINT + sync-sleep cancel tests
+- `cb6202e3` port `test_dynamic_pub_sub`
+- `d8af5f12` port non-debugging examples
+- `a3057cb2` port debugging examples (+ `test_debugger`
+  nested-nurseries final-shape expectations)
+- `d6bed7c4` port docs (8 rst pages)
+- `07e1669e` fix stale `@pub` docstring example
+- `2a59cefb` REMOVE `run_in_actor()` + the ria reap cluster
+  (net -402 lines)
+- `a297a32a` fix mutual-rendezvous premature-reap race
+- `ad42871e` `an: ActorNursery` naming sweep
+
+Plan/design record updated in
+`ai/conc-anal/ria_nursery_removal_plan.md` (RESOLVED section +
+the `to_actor.open_one_shot()` follow-up sketch).

ai/prompt-io/claude/README.md

@@ -0,0 +1,27 @@
+# AI Prompt I/O Log — claude
+
+This directory tracks prompt inputs and model
+outputs for AI-assisted development using
+`claude` (Claude Code).
+
+## Policy
+
+Prompt logging follows the
+[NLNet generative AI policy][nlnet-ai].
+All substantive AI contributions are logged
+with:
+- Model name and version
+- Timestamps
+- The prompts that produced the output
+- Unedited model output (`.raw.md` files)
+
+[nlnet-ai]: https://nlnet.nl/foundation/policies/generativeAI/
+
+## Usage
+
+Entries are created by the `/prompt-io` skill
+or automatically via `/commit-msg` integration.
+
+Human contributors remain accountable for all
+code decisions. AI-generated content is never
+presented as human-authored work.

ai/prompt-io/prompts/issue_477.md

@@ -0,0 +1,7 @@
+NOTE: you MUST pause this work at 12:50PM EST (BEFORE your weekly
+limit reset) for review by a human!
+
+---
+
+attempt to resolve https://github.com/goodboy/tractor/issues/477
+do it with /open-wkt.

ai/prompt-io/prompts/issue_485.md

@@ -0,0 +1,36 @@
+attempt to resolve (PR A of)
+https://github.com/goodboy/tractor/issues/485
+do it with /open-wkt (suggested wkt name: `taskman_485`).
+
+REQUIRED READING before writing any code,
+
+- the full design + impl plan (self-contained hand-off doc):
+  `ai/conc-anal/to_actor_taskman_design.md`
+  * it resolves the open design items, carries the
+    `hilevel_serman` rebase/convergence map (incl. the known
+    `portal.wait_for_result()` breakage at `_service.py:292`)
+    and defines the PR A/B/C sequencing — follow it.
+- the issue body (the contract + task list): #485
+- prior art to derive from,
+  * branch `hilevel_serman` (tip `93d161bf`): the
+    `tractor/hilevel/_service.py` `ServiceMngr` port — rebase
+    it first per the doc.
+  * PR #363 (`oco_supervisor_prototype`): the `trionics`
+    taskman prototype.
+  * `ria_nursery_removal_plan.md` (same dir as the design doc)
+    for the #477 background + the `open_one_shot()` sketch this
+    generalizes.
+
+house rules (also see the repo/global CLAUDE.md + skills),
+
+- NEVER `git commit`/`push` without an explicit human ack in
+  the moment; per-file/-group commits for bisectability, with
+  a failing test landing BEFORE its fix (red -> green).
+- gate per-commit: module tests on `trio` + `mp_spawn`
+  spot-gates, ALWAYS incl. `tests/test_infected_asyncio.py`
+  for spawn/supervise-touching changes; full suite green
+  before PR (`UV_PROJECT_ENVIRONMENT=py313 uv run pytest`).
+- all `ActorNursery` bindings are named `an:`; `trio` nursery
+  bindings `tn:`.
+- log prompt-io per the NLNet policy (`/prompt-io` skill) and
+  update the design doc's outcome as you land steps.

ai/prompt-io/prompts/multiaddr_declare_eps.md

@@ -0,0 +1,76 @@
+ok now i want you to take a look at the most recent commit adding
+a `tpt_bind_addrs` to `open_root_actor()` and extend the existing
+tests/discovery/test_multiaddr* and friends to use this new param in
+at least one suite with parametrizations over,
+
+- `registry_addrs == tpt_bind_addrs`, as in both inputs are the same.
+- `set(registry_addrs) >= set(tpt_bind_addrs)`, as in the registry
+  addrs include the bind set.
+- `registry_addrs != tpt_bind_addrs`, where the reg set is disjoint from
+  the bind set in all possible combos you can imagine.
+
+All of the ^above cases should further be parametrized over,
+- the root being the registrar,
+- a non-registrar root using our bg `daemon` fixture.
+
+once we have a fairly thorough test suite and have flushed out all
+bugs and edge cases we want to design a wrapping API which allows
+declaring full tree's of actors tpt endpoints using multiaddrs such
+that a `dict[str, list[str]]` of actor-name -> multiaddr can be used
+to configure a tree of actors-as-services given such an input
+"endpoints-table" can be matched with the number of appropriately
+named subactore spawns in a `tractor` user-app.
+
+Here is a small example from piker,
+
+- in piker's root conf.toml we define a `[network]` section which can
+  define various actor-service-daemon names set to a maddr
+  (multiaddress str).
+
+- each actor whether part of the `pikerd` tree (as a sub) or spawned
+  in other non-registrar rooted trees (such as `piker chart`) should
+  configurable in terms of its `tractor` tpt bind addresses via
+  a simple service lookup table,
+
+  ```toml
+  [network]
+  pikerd = [
+    '/ip4/127.0.0.1/tcp/6116',  # std localhost daemon-actor tree
+    '/uds/run/user/1000/piker/pikerd@6116.sock',  # same but serving UDS
+  ]
+  chart = [
+    '/ip4/127.0.0.1/tcp/3333',  # std localhost daemon-actor tree
+    '/uds/run/user/1000/piker/chart@3333.sock',
+  ]
+  ```
+
+We should take whatever common API is needed to support this and
+distill it into a
+```python
+tractor.discovery.parse_endpoints(
+) -> dict[
+  str,
+  list[Address]
+  |dict[str, list[Address]]
+  # ^recursive case, see below
+]:
+```
+
+style API which can,
+
+- be re-used easily across dependent projects.
+- correctly raise tpt-backend support errors when a maddr specifying
+  a unsupport proto is passed.
+- be used to handle "tunnelled" maddrs per
+  https://github.com/multiformats/py-multiaddr/#tunneling such that
+  for any such tunneled maddr-`str`-entry we deliver a data-structure
+  which can easily be passed to nested `@acm`s which consecutively
+  setup nested net bindspaces for binding the endpoint addrs using
+  a combo of our `.ipc.*` machinery and, say for example something like
+  https://github.com/svinota/pyroute2, more precisely say for
+  managing tunnelled wireguard eps within network-namespaces,
+  * https://docs.pyroute2.org/
+  * https://docs.pyroute2.org/netns.html
+
+remember to include use of all default `.claude/skills` throughout
+this work!

ai/prompt-io/prompts/subints_spawner.md

@@ -0,0 +1,34 @@
+This is your first big boi, "from GH issue" design, plan and
+implement task.
+
+We need to try and add sub-interpreter (aka subint) support per the
+issue,
+
+https://github.com/goodboy/tractor/issues/379
+
+Part of this work should include,
+
+- modularizing and thus better organizing the `.spawn.*` subpkg by
+  breaking up various backends currently in `spawn._spawn` into
+  separate submods where it makes sense.
+
+- add a new `._subint` backend which tries to keep as much of the
+  inter-process-isolation machinery in use as possible but with plans
+  to optimize for localhost only benefits as offered by python's
+  subints where possible.
+
+  * utilizing localhost-only tpts like UDS, shm-buffers for
+    performant IPC between subactors but also leveraging the benefits from
+    the traditional OS subprocs mem/storage-domain isolation, linux
+    namespaces where possible and as available/permitted by whatever
+    is happening under the hood with how cpython implements subints.
+
+  * default configuration should encourage state isolation as with
+    subprocs, but explicit public escape hatches to enable rigorously
+    managed shm channels for high performance apps.
+
+- all tests should be (able to be) parameterized to use the new
+  `subints` backend and enabled by flag in the harness using the
+  existing `pytest --spawn-backend <spawn-backend>` support offered in
+  the `open_root_actor()` and `.testing._pytest` harness override
+  fixture.

ai/tooling-todos/logspec_leaf_module_granularity_route_b.md

@@ -0,0 +1,159 @@
+# Logging-spec leaf-module granularity — "Route B" (decouple
+# logger-*identity* from console-*display*)
+
+Follow-up notes recording the breaking-changes / costs of the
+deeper fix that would give the `tractor.log` logging-spec (see
+`LogSpec`/`apply_logspec()`) true **per-leaf-MODULE** level
+control — deliberately *not* taken (for now) in favour of the
+smaller sub-PACKAGE fix already landed.
+
+## Status / what already shipped
+
+The cheap, contained fix is **done**: `get_logger()`'s "strip
+#2" (`log.py`, the `pkg_path = subpkg_path` collapse) no longer
+eats a real sub-package component. It now strips the trailing
+token *only* when it duplicates the caller's leaf-*module*
+filename (which the header already shows via `{filename}`).
+
+Result:
+
+- `devx.debug` resolves to `tractor.devx.debug`, **distinct**
+  from a bare `devx` -> `tractor.devx` (its parent). So the
+  logging-spec can dial sub-package levels at any nesting depth
+  (`devx.debug:runtime` ≠ `devx:cancel`).
+- The `get_logger(__name__)` cosmetic ("don't repeat the leaf
+  module in `{name}` since `{filename}` shows it") is preserved.
+
+What is **still NOT addressable** after that fix:
+
+- **Per-leaf-MODULE** levels. Every module in a (sub-)pkg shares
+  that pkg's logger, because `get_logger()` drops the leaf
+  module-name from the logger key by design.
+- **Top-level lib modules** (eg. `tractor.to_asyncio`,
+  `__package__ == 'tractor'`) emit on the *root* `tractor`
+  logger, so a `to_asyncio:<lvl>` spec entry hits a phantom
+  child -> no-op.
+
+## What "Route B" is
+
+Make the logger's *identity* the **full dotted module path**
+(incl. the leaf module + top-level modules), eg.
+`tractor.devx.debug._tty_lock` and `tractor.to_asyncio`, and
+move the cosmetic leaf-trim out of logger-naming and into the
+**formatter's `{name}` rendering**.
+
+Net effect:
+
+- Real per-module `Logger` nodes exist in the hierarchy ->
+  the spec can target ANY module; stdlib level-inheritance and
+  propagation "just work" top-down.
+- Console headers stay clean because the formatter computes a
+  trimmed display string (drop the trailing token that equals
+  `{filename}`'s stem) instead of the logger doing it.
+
+## Why it's "broad" — breaking changes / costs
+
+The logger *name* is currently load-bearing well beyond
+display; changing it ripples:
+
+1. **Every logger name changes.**
+   Today (post sub-pkg fix) names collapse to the sub-package;
+   Route B = full module path. This touches:
+   - handler attachment points + the `getChild()` hierarchy,
+   - any `logging.getLogger('tractor.X')` string lookups,
+   - any name-based filtering,
+   - the dedup / `_strict_debug` warning logic *inside*
+     `get_logger()` itself — the `pkg_name in name`,
+     `leaf_mod in pkg_path`, "duplicate pkg-name" branches all
+     key off the *name shape* and would need re-derivation.
+
+2. **Formatter rewrite.**
+   `LOG_FORMAT` uses `{name}` == `record.name` (the full logger
+   name). To keep headers clean we must compute a *display*
+   name and inject it as a record attr (eg. `record.pkg_ns`)
+   via a `logging.Filter` or a `colorlog.ColoredFormatter`
+   subclass overriding `.format()`, then point `LOG_FORMAT` at
+   that field. The `{filename}` vs `{name}` de-dup intent has
+   to be re-implemented per-record rather than per-logger.
+
+3. **Propagation / double-emit surface grows.**
+   Full-depth loggers mean more intermediate nodes
+   (`...debug._tty_lock` -> `.debug` -> `.devx` -> `tractor`).
+   If more than one level carries a handler (spec sub-handlers
+   + a root console), records double-emit. The
+   `propagate=False` trick we already use for filter-targeted
+   sub-loggers (`apply_logspec()`) must be applied carefully
+   across a deeper tree — more levels == more places to leak a
+   dup.
+
+4. **Level-inheritance semantics shift.**
+   Today setting a level on `tractor.devx` gates *all* devx
+   emits (they share that logger). Post-Route-B,
+   `tractor.devx.debug._tty_lock` is its own `NOTSET` logger
+   that *inherits* the effective level from ancestors —
+   functionally similar via inheritance, BUT any code that does
+   `log.setLevel(...)` / reads `log.level` on a (previously
+   collapsed) logger now only affects that exact node. All
+   `setLevel`/`.level =` call sites need an audit (eg.
+   `get_logger()`'s own `log.level = rlog.level` line).
+
+5. **Downstream contract churn.**
+   `modden` / `piker` call `get_logger()` / `get_console_log()`
+   and may depend on current names — including
+   `modden.runtime.daemon.setup_tractor_logging()` which
+   asserts `'tractor' not in name` on spec parts. The header
+   `{name}` field is user-visible in everyone's logs + CI
+   output. Changing the canonical names is a public-ish
+   behavior change -> needs a version note + downstream
+   coordination (or a formatter trim that keeps the *displayed*
+   string byte-identical to today).
+
+6. **`get_logger()` refactor risk.**
+   The fn tangles two concerns: compute logger *identity* and
+   compute the *display* string. Route B forces splitting them
+   inside a ~300-line fn with multiple `_strict_debug`
+   branches, dup-warnings, and the `name=__name__` convenience.
+   High chance of subtle regressions without an exhaustive
+   name-derivation test matrix.
+
+## Migration / test plan (if pursued)
+
+- Extract a pure helper
+  `_mk_logger_name(pkg_name, mod_name, mod_pkg) -> (logger_name,
+  display_name)` and cover it with an exhaustive unit matrix:
+  auto vs explicit vs `__name__`; package-`__init__` vs leaf
+  module; nested vs flat; `pkg_name in name` vs not; top-level
+  module (`__package__ == pkg_name`).
+- Switch `get_logger()` to use it for *identity*; switch the
+  formatter to use `display_name` (via a record attr).
+- Re-run the full suite + golden-diff a sample of rendered log
+  headers to confirm zero cosmetic churn.
+- Coordinate the name change with `modden`/`piker`; bump +
+  CHANGES note.
+
+## Cheaper alternative — "Route A" (record-filter)
+
+If per-leaf control is wanted *before* committing to Route B:
+keep names collapsed, add a `logging.Filter` on the configured
+handler keyed on `record.module` / `record.pathname` that maps
+each record's source module -> its spec level. Set the base
+logger to the *minimum* level in the spec (so records aren't
+pre-dropped by the logger), and let the filter discriminate
+up/down within that floor.
+
+- Pros: no name churn, no formatter change, fully contained
+  next to `apply_logspec()`.
+- Cons: a filter can only discriminate *within* what the logger
+  admits -> base must be permissive, so `at_least_level()`
+  expensive-work guards over-admit; matching dotted spec names
+  to a `pathname` is fiddly; doesn't clean up the hierarchy
+  itself.
+
+## Recommendation
+
+- Defer Route B unless true per-module loggers are wanted as a
+  first-class feature.
+- If per-leaf control is needed soon, prefer **Route A**
+  (filter) — lower risk.
+- The shipped sub-PACKAGE fix already covers the common ask
+  (`devx.debug` vs `devx`).

docs/README.rst

@@ -1,4 +1,4 @@
-|logo| ``tractor``: distributed structurred concurrency
+|logo| ``tractor``: distributed structured concurrency
 
 ``tractor`` is a `structured concurrency`_ (SC), multi-processing_ runtime built on trio_.
 
@@ -23,16 +23,11 @@ model" looks like, and that's **intentional**.
 
 Where do i start!?
 ------------------
-The first step to grok ``tractor`` is to get an intermediate
-knowledge of ``trio`` and **structured concurrency** B)
-
-Some great places to start are,
-
-- the seminal `blog post`_
-- obviously the `trio docs`_
-- wikipedia's nascent SC_ page
-- the fancy diagrams @ libdill-docs_
+New to ``trio`` and **structured concurrency**? Our docs collect the
+best starting points and then walk you straight into a hands-on
+quickstart:
 
+  https://goodboy.github.io/tractor/start/quickstart.html
 
 Features
 --------
@@ -57,6 +52,7 @@ Features
   `discovery`_ sys with plans to support multiple `modern protocol`_
   approaches.
 - Various ``trio`` extension APIs via ``tractor.trionics`` such as,
+
   - task fan-out `broadcasting`_,
   - multi-task-single-resource-caching and fan-out-to-multi
     ``__aenter__()`` APIs for ``@acm`` functions,
@@ -98,7 +94,7 @@ the code base::
 
     # but @goodboy prefers the more explicit (and shell agnostic)
     # https://docs.astral.sh/uv/configuration/environment/#uv_project_environment
-    UV_PROJECT_ENVIRONMENT="tractor_py313
+    UV_PROJECT_ENVIRONMENT="tractor_py313"
 
     # hint hint, enter @goodboy's fave shell B)
     uv run --dev xonsh
@@ -110,545 +106,53 @@ Alongside all this we ofc offer "releases" on PyPi::
 Just note that YMMV since the main git branch is often much further
 ahead then any latest release.
 
+Hacking on the docs themselves? The build + live-preview one-liners
+(incl. nix-shell specifics) are collected in `notes_to_self/howtodocs.md
+<https://github.com/goodboy/tractor/blob/main/notes_to_self/howtodocs.md>`_,
+and rendered as the "Building these docs" section of our dev-tips guide.
+
 
 Example codez
 -------------
-In ``tractor``'s (very lacking) documention we prefer to point to
-example scripts in the repo over duplicating them in docs, but with
-that in mind here are some definitive snippets to try and hook you
-into digging deeper.
-
-
-Run a func in a process
-***********************
-Use ``trio``'s style of focussing on *tasks as functions*:
-
-.. code:: python
-
-    """
-    Run with a process monitor from a terminal using::
-
-        $TERM -e watch -n 0.1  "pstree -a $$" \
-            & python examples/parallelism/single_func.py \
-            && kill $!
-
-    """
-    import os
-
-    import tractor
-    import trio
-
-
-    async def burn_cpu():
-
-        pid = os.getpid()
-
-        # burn a core @ ~ 50kHz
-        for _ in range(50000):
-            await trio.sleep(1/50000/50)
-
-        return os.getpid()
-
-
-    async def main():
-
-        async with tractor.open_nursery() as n:
-
-            portal = await n.run_in_actor(burn_cpu)
-
-            #  burn rubber in the parent too
-            await burn_cpu()
-
-            # wait on result from target function
-            pid = await portal.result()
-
-        # end of nursery block
-        print(f"Collected subproc {pid}")
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-This runs ``burn_cpu()`` in a new process and reaps it on completion
-of the nursery block.
-
-If you only need to run a sync function and retreive a single result, you
-might want to check out `trio-parallel`_.
-
-
-Zombie safe: self-destruct a process tree
-*****************************************
-``tractor`` tries to protect you from zombies, no matter what.
-
-.. code:: python
-
-    """
-    Run with a process monitor from a terminal using::
-
-        $TERM -e watch -n 0.1  "pstree -a $$" \
-            & python examples/parallelism/we_are_processes.py \
-            && kill $!
-
-    """
-    from multiprocessing import cpu_count
-    import os
-
-    import tractor
-    import trio
-
-
-    async def target():
-        print(
-            f"Yo, i'm '{tractor.current_actor().name}' "
-            f"running in pid {os.getpid()}"
-        )
-
-        await trio.sleep_forever()
-
-
-    async def main():
-
-        async with tractor.open_nursery() as n:
-
-            for i in range(cpu_count()):
-                await n.run_in_actor(target, name=f'worker_{i}')
-
-            print('This process tree will self-destruct in 1 sec...')
-            await trio.sleep(1)
-
-            # raise an error in root actor/process and trigger
-            # reaping of all minions
-            raise Exception('Self Destructed')
-
-
-    if __name__ == '__main__':
-        try:
-            trio.run(main)
-        except Exception:
-            print('Zombies Contained')
-
-
-If you can create zombie child processes (without using a system signal)
-it **is a bug**.
-
-
-"Native" multi-process debugging
-********************************
-Using the magic of `pdbp`_ and our internal IPC, we've
-been able to create a native feeling debugging experience for
-any (sub-)process in your ``tractor`` tree.
-
-.. code:: python
-
-    from os import getpid
-
-    import tractor
-    import trio
-
-
-    async def breakpoint_forever():
-        "Indefinitely re-enter debugger in child actor."
-        while True:
-            yield 'yo'
-            await tractor.breakpoint()
-
-
-    async def name_error():
-        "Raise a ``NameError``"
-        getattr(doggypants)
-
-
-    async def main():
-        """Test breakpoint in a streaming actor.
-        """
-        async with tractor.open_nursery(
-            debug_mode=True,
-            loglevel='error',
-        ) as n:
-
-            p0 = await n.start_actor('bp_forever', enable_modules=[__name__])
-            p1 = await n.start_actor('name_error', enable_modules=[__name__])
-
-            # retreive results
-            stream = await p0.run(breakpoint_forever)
-            await p1.run(name_error)
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-You can run this with::
-
-    >>> python examples/debugging/multi_daemon_subactors.py
-
-And, yes, there's a built-in crash handling mode B)
-
-We're hoping to add a respawn-from-repl system soon!
-
-
-SC compatible bi-directional streaming
-**************************************
-Yes, you saw it here first; we provide 2-way streams
-with reliable, transitive setup/teardown semantics.
-
-Our nascent api is remniscent of ``trio.Nursery.start()``
-style invocation:
-
-.. code:: python
-
-    import trio
-    import tractor
-
-
-    @tractor.context
-    async def simple_rpc(
-
-        ctx: tractor.Context,
-        data: int,
-
-    ) -> None:
-        '''Test a small ping-pong 2-way streaming server.
-
-        '''
-        # signal to parent that we're up much like
-        # ``trio_typing.TaskStatus.started()``
-        await ctx.started(data + 1)
-
-        async with ctx.open_stream() as stream:
-
-            count = 0
-            async for msg in stream:
-
-                assert msg == 'ping'
-                await stream.send('pong')
-                count += 1
-
-            else:
-                assert count == 10
-
-
-    async def main() -> None:
-
-        async with tractor.open_nursery() as n:
-
-            portal = await n.start_actor(
-                'rpc_server',
-                enable_modules=[__name__],
-            )
-
-            # XXX: this syntax requires py3.9
-            async with (
-
-                portal.open_context(
-                    simple_rpc,
-                    data=10,
-                ) as (ctx, sent),
-
-                ctx.open_stream() as stream,
-            ):
-
-                assert sent == 11
-
-                count = 0
-                # receive msgs using async for style
-                await stream.send('ping')
-
-                async for msg in stream:
-                    assert msg == 'pong'
-                    await stream.send('ping')
-                    count += 1
-
-                    if count >= 9:
-                        break
-
-
-            # explicitly teardown the daemon-actor
-            await portal.cancel_actor()
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-See original proposal and discussion in `#53`_ as well
-as follow up improvements in `#223`_ that we'd love to
-hear your thoughts on!
-
-.. _#53: https://github.com/goodboy/tractor/issues/53
-.. _#223: https://github.com/goodboy/tractor/issues/223
-
-
-Worker poolz are easy peasy
-***************************
-The initial ask from most new users is *"how do I make a worker
-pool thing?"*.
-
-``tractor`` is built to handle any SC (structured concurrent) process
-tree you can imagine; a "worker pool" pattern is a trivial special
-case.
-
-We have a `full worker pool re-implementation`_ of the std-lib's
-``concurrent.futures.ProcessPoolExecutor`` example for reference.
-
-You can run it like so (from this dir) to see the process tree in
-real time::
-
-    $TERM -e watch -n 0.1  "pstree -a $$" \
-        & python examples/parallelism/concurrent_actors_primes.py \
-        && kill $!
-
-This uses no extra threads, fancy semaphores or futures; all we need
-is ``tractor``'s IPC!
-
-"Infected ``asyncio``" mode
-***************************
-Have a bunch of ``asyncio`` code you want to force to be SC at the process level?
-
-Check out our experimental system for `guest`_-mode controlled
-``asyncio`` actors:
-
-.. code:: python
-
-    import asyncio
-    from statistics import mean
-    import time
-
-    import trio
-    import tractor
-
-
-    async def aio_echo_server(
-        to_trio: trio.MemorySendChannel,
-        from_trio: asyncio.Queue,
-    ) -> None:
-
-        # a first message must be sent **from** this ``asyncio``
-        # task or the ``trio`` side will never unblock from
-        # ``tractor.to_asyncio.open_channel_from():``
-        to_trio.send_nowait('start')
-
-        # XXX: this uses an ``from_trio: asyncio.Queue`` currently but we
-        # should probably offer something better.
-        while True:
-            # echo the msg back
-            to_trio.send_nowait(await from_trio.get())
-            await asyncio.sleep(0)
-
-
-    @tractor.context
-    async def trio_to_aio_echo_server(
-        ctx: tractor.Context,
-    ):
-        # this will block until the ``asyncio`` task sends a "first"
-        # message.
-        async with tractor.to_asyncio.open_channel_from(
-            aio_echo_server,
-        ) as (first, chan):
-
-            assert first == 'start'
-            await ctx.started(first)
-
-            async with ctx.open_stream() as stream:
-
-                async for msg in stream:
-                    await chan.send(msg)
-
-                    out = await chan.receive()
-                    # echo back to parent actor-task
-                    await stream.send(out)
-
-
-    async def main():
-
-        async with tractor.open_nursery() as n:
-            p = await n.start_actor(
-                'aio_server',
-                enable_modules=[__name__],
-                infect_asyncio=True,
-            )
-            async with p.open_context(
-                trio_to_aio_echo_server,
-            ) as (ctx, first):
-
-                assert first == 'start'
-
-                count = 0
-                async with ctx.open_stream() as stream:
-
-                    delays = []
-                    send = time.time()
-
-                    await stream.send(count)
-                    async for msg in stream:
-                        recv = time.time()
-                        delays.append(recv - send)
-                        assert msg == count
-                        count += 1
-                        send = time.time()
-                        await stream.send(count)
-
-                        if count >= 1e3:
-                            break
-
-            print(f'mean round trip rate (Hz): {1/mean(delays)}')
-            await p.cancel_actor()
-
-
-    if __name__ == '__main__':
-        trio.run(main)
-
-
-Yes, we spawn a python process, run ``asyncio``, start ``trio`` on the
-``asyncio`` loop, then send commands to the ``trio`` scheduled tasks to
-tell ``asyncio`` tasks what to do XD
-
-We need help refining the `asyncio`-side channel API to be more
-`trio`-like. Feel free to sling your opinion in `#273`_!
-
-
-.. _#273: https://github.com/goodboy/tractor/issues/273
-
-
-Higher level "cluster" APIs
-***************************
-To be extra terse the ``tractor`` devs have started hacking some "higher
-level" APIs for managing actor trees/clusters. These interfaces should
-generally be condsidered provisional for now but we encourage you to try
-them and provide feedback. Here's a new API that let's you quickly
-spawn a flat cluster:
-
-.. code:: python
-
-    import trio
-    import tractor
-
-
-    async def sleepy_jane():
-        uid = tractor.current_actor().uid
-        print(f'Yo i am actor {uid}')
-        await trio.sleep_forever()
-
-
-    async def main():
-        '''
-        Spawn a flat actor cluster, with one process per
-        detected core.
-
-        '''
-        portal_map: dict[str, tractor.Portal]
-        results: dict[str, str]
-
-        # look at this hip new syntax!
-        async with (
-
-            tractor.open_actor_cluster(
-                modules=[__name__]
-            ) as portal_map,
-
-            trio.open_nursery() as n,
-        ):
-
-            for (name, portal) in portal_map.items():
-                n.start_soon(portal.run, sleepy_jane)
-
-            await trio.sleep(0.5)
-
-            # kill the cluster with a cancel
-            raise KeyboardInterrupt
-
-
-    if __name__ == '__main__':
-        try:
-            trio.run(main)
-        except KeyboardInterrupt:
-            pass
-
-
-.. _full worker pool re-implementation: https://github.com/goodboy/tractor/blob/master/examples/parallelism/concurrent_actors_primes.py
-
+We prefer to point you at the runnable scripts under ``examples/``
+- each is CI-run and ``literalinclude``-d straight into the docs, so
+what you read there is what actually runs - rather than inline a
+pile of them here. The one-minute pitch: spawn a subactor per core,
+open a ``Context`` into each, then crash the root *on purpose* and
+watch the runtime reap the whole tree - zero zombies, guaranteed (if
+you can make a zombie child without a system signal, it **is a
+bug**).
+
+See it run - plus the full tour (the flagship multi-process
+debugger, bidirectional streaming over a ``Context``, cancellation,
+discovery, "infected ``asyncio``", typed messaging and worker-pool /
+cluster patterns) - in the docs:
+
+- docs: https://goodboy.github.io/tractor/
+- examples: https://github.com/goodboy/tractor/tree/main/examples
 
 Under the hood
 --------------
-``tractor`` is an attempt to pair trionic_ `structured concurrency`_ with
-distributed Python. You can think of it as a ``trio``
-*-across-processes* or simply as an opinionated replacement for the
-stdlib's ``multiprocessing`` but built on async programming primitives
-from the ground up.
+``tractor`` is an attempt to pair trionic_ `structured
+concurrency`_ with distributed Python - think of it as ``trio``
+*-across-processes*, or as an opinionated replacement for the
+stdlib's ``multiprocessing`` built on async primitives from the
+ground up. But really it **is just** ``trio``: nurseries that
+spawn *processes* and cancel-able streaming IPC between them. If
+you can drive ``trio``, you can drive ``tractor``.
 
-Don't be scared off by this description. ``tractor`` **is just** ``trio``
-but with nurseries for process management and cancel-able streaming IPC.
-If you understand how to work with ``trio``, ``tractor`` will give you
-the parallelism you may have been needing.
+"But wait - don't 'actors' have mailboxes and messages and
+stuff?!" Well, we've got (well referenced) opinions on what an "actor
+model" **actually is** (tl;dr: the `3 axioms`_, not the cultural
+baggage) - that whole riff lives in our docs:
 
+  https://goodboy.github.io/tractor/explain/sc-distributed.html#hold-up-is-this-an-actor-model
 
-Wait, huh?! I thought "actors" have messages, and mailboxes and stuff?!
-***********************************************************************
-Let's stop and ask how many canon actor model papers have you actually read ;)
-
-From our experience many "actor systems" aren't really "actor models"
-since they **don't adhere** to the `3 axioms`_ and pay even less
-attention to the problem of *unbounded non-determinism* (which was the
-whole point for creation of the model in the first place).
-
-From the author's mouth, **the only thing required** is `adherance to`_
-the `3 axioms`_, *and that's it*.
-
-``tractor`` adheres to said base requirements of an "actor model"::
-
-    In response to a message, an actor may:
-
-    - send a finite number of new messages
-    - create a finite number of new actors
-    - designate a new behavior to process subsequent messages
-
-
-**and** requires *no further api changes* to accomplish this.
-
-If you want do debate this further please feel free to chime in on our
-chat or discuss on one of the following issues *after you've read
-everything in them*:
-
-- https://github.com/goodboy/tractor/issues/210
-- https://github.com/goodboy/tractor/issues/18
-
-
-Let's clarify our parlance
-**************************
-Whether or not ``tractor`` has "actors" underneath should be mostly
-irrelevant to users other then for referring to the interactions of our
-primary runtime primitives: each Python process + ``trio.run()``
-+ surrounding IPC machinery. These are our high level, base
-*runtime-units-of-abstraction* which both *are* (as much as they can
-be in Python) and will be referred to as our *"actors"*.
-
-The main goal of ``tractor`` is is to allow for highly distributed
-software that, through the adherence to *structured concurrency*,
-results in systems which fail in predictable, recoverable and maybe even
-understandable ways; being an "actor model" is just one way to describe
-properties of the system.
-
-
-What's on the TODO:
--------------------
-Help us push toward the future of distributed `Python`.
-
-- Erlang-style supervisors via composed context managers (see `#22
-  <https://github.com/goodboy/tractor/issues/22>`_)
-- Typed messaging protocols (ex. via ``msgspec.Struct``, see `#36
-  <https://github.com/goodboy/tractor/issues/36>`_)
-- Typed capability-based (dialog) protocols ( see `#196
-  <https://github.com/goodboy/tractor/issues/196>`_ with draft work
-  started in `#311 <https://github.com/goodboy/tractor/pull/311>`_)
-- We **recently disabled CI-testing on windows** and need help getting
-  it running again! (see `#327
-  <https://github.com/goodboy/tractor/pull/327>`_). **We do have windows
-  support** (and have for quite a while) but since no active hacker
-  exists in the user-base to help test on that OS, for now we're not
-  actively maintaining testing due to the added hassle and general
-  latency..
-
+What's on the TODO
+------------------
+The roadmap lives with our docs - see `what the future holds
+<https://goodboy.github.io/tractor/project/index.html#what-the-future-holds>`_
+for where ``tractor`` is headed.
 
 Feel like saying hi?
 --------------------
@@ -659,36 +163,24 @@ say hi, please feel free to reach us in our `matrix channel`_.  If
 matrix seems too hip, we're also mostly all in the the `trio gitter
 channel`_!
 
-.. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228
 .. _distributed: https://en.wikipedia.org/wiki/Distributed_computing
 .. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing
 .. _trio: https://github.com/python-trio/trio
 .. _nurseries: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/#nurseries-a-structured-replacement-for-go-statements
 .. _actor model: https://en.wikipedia.org/wiki/Actor_model
 .. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles
-.. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich
 .. _3 axioms: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
 .. .. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
-.. _adherance to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
 .. _trio gitter channel: https://gitter.im/python-trio/general
 .. _matrix channel: https://matrix.to/#/!tractor:matrix.org
 .. _broadcasting: https://github.com/goodboy/tractor/pull/229
-.. _modern procotol: https://en.wikipedia.org/wiki/Rendezvous_protocol
 .. _pdbp: https://github.com/mdmintz/pdbp
 .. _pdb++: https://github.com/pdbpp/pdbpp
 .. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
 .. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
 .. _discovery: https://zguide.zeromq.org/docs/chapter8/#Discovery
 .. _modern protocol: https://en.wikipedia.org/wiki/Rendezvous_protocol
-.. _messages: https://en.wikipedia.org/wiki/Message_passing
-.. _trio docs: https://trio.readthedocs.io/en/latest/
-.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
 .. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
-.. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony
-.. _async generators: https://www.python.org/dev/peps/pep-0525/
-.. _trio-parallel: https://github.com/richardsheridan/trio-parallel
 .. _uv: https://docs.astral.sh/uv/
 .. _msgspec: https://jcristharif.com/msgspec/
 .. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
@@ -699,10 +191,10 @@ channel`_!
 .. |gh_actions| image:: https://github.com/goodboy/tractor/actions/workflows/ci.yml/badge.svg?branch=main
     :target: https://github.com/goodboy/tractor/actions/workflows/ci.yml
 
-.. |docs| image:: https://readthedocs.org/projects/tractor/badge/?version=latest
-    :target: https://tractor.readthedocs.io/en/latest/?badge=latest
-    :alt: Documentation Status
+.. |docs| image:: https://github.com/goodboy/tractor/actions/workflows/docs.yml/badge.svg?branch=main
+    :target: https://goodboy.github.io/tractor/
+    :alt: Documentation
 
-.. |logo| image:: _static/tractor_logo_side.svg
+.. |logo| image:: _static/tractor_logo_wire.svg
     :width: 250
     :align: middle

docs/_ext/d2diagrams.py

@@ -0,0 +1,387 @@
+# tractor: distributed structured concurrency.
+'''
+``.. d2::`` - embed d2lang_ diagrams in sphinx docs
+with build-time rendering and a committed-SVG
+fallback.
+
+Rendering policy,
+
+- when a ``d2`` binary is found (see discovery order
+  below) any out-of-date SVG is (re)rendered from its
+  ``.d2`` source (normally kept in ``docs/diagrams/``)
+  into ``docs/_diagrams/``,
+- otherwise any pre-rendered (and git committed) SVG
+  already in ``docs/_diagrams/`` is used as-is,
+- when neither is possible the diagram *source* is
+  emitted as a literal block so no content is ever
+  silently dropped.
+
+A render that is *attempted and fails* (a ``d2`` bin is
+present but errors on the source) is NOT silently
+degraded to the stale committed SVG: it raises a
+docutils error (so ``sphinx-build -W`` fails the
+build). The render is also atomic — a failed/torn
+render can never clobber a good committed SVG — so the
+last-good diagram survives a bad edit.
+
+Binary discovery order,
+
+- the ``D2_BIN`` env var; may contain args which are
+  split via `shlex`, eg.
+  ``D2_BIN='nix run nixpkgs#d2 --'``,
+- the ``d2_bin`` sphinx config value,
+- ``shutil.which('d2')``.
+
+Usage,
+
+.. code:: rst
+
+    .. d2:: diagrams/actor_tree.d2
+       :caption: A tree of ``trio``-task-trees.
+       :margin:
+
+.. _d2lang: https://d2lang.com
+
+'''
+from __future__ import annotations
+
+import enum
+import hashlib
+import os
+from pathlib import Path
+import re
+import shlex
+import shutil
+import subprocess as sp
+import tempfile
+
+from docutils import nodes
+from docutils.parsers.rst import directives
+from sphinx.application import Sphinx
+from sphinx.util import logging
+from sphinx.util.docutils import SphinxDirective
+
+log = logging.getLogger(__name__)
+
+# subdir (under the sphinx srcdir) holding rendered,
+# git-committed, fallback SVG outputs.
+_outdir: str = '_diagrams'
+
+# per-build map of {output-svg-name: source-relpath} used
+# to detect 2 distinct `.d2` sources colliding on a single
+# output stem; reset on each `builder-inited` (see `setup`).
+_seen_outputs: dict[str, str] = {}
+
+
+class RenderResult(enum.Enum):
+    '''
+    Outcome of a `render_svg()` call.
+
+    '''
+    OK = 'ok'                # fresh SVG exists on disk
+    FELL_BACK = 'fell_back'  # no bin; serving committed SVG
+    NO_OUTPUT = 'no_output'  # no bin AND no committed SVG
+    FAILED = 'failed'        # bin present, render errored
+
+
+def find_d2(
+    app: Sphinx,
+) -> list[str]|None:
+    '''
+    Resolve the d2 render command as an argv list or
+    `None` when no binary can be found.
+
+    '''
+    if env_bin := os.environ.get('D2_BIN'):
+        return shlex.split(env_bin)
+    if cfg_bin := app.config.d2_bin:
+        return shlex.split(cfg_bin)
+    if path_bin := shutil.which('d2'):
+        return [path_bin]
+    return None
+
+
+def render_svg(
+    app: Sphinx,
+    src: Path,
+    out: Path,
+) -> RenderResult:
+    '''
+    Maybe (re)render `src` -> `out` and report the
+    outcome as a `RenderResult`.
+
+    A render is performed only when `out` is missing or
+    older than `src` AND a `d2` binary is available. The
+    write is atomic (temp-file + `os.replace`) so a
+    failed or torn render never clobbers an existing
+    (committed) SVG.
+
+    '''
+    fresh: bool = (
+        out.exists()
+        and
+        src.stat().st_mtime <= out.stat().st_mtime
+    )
+    if fresh:
+        return RenderResult.OK
+    d2cmd: list[str]|None = find_d2(app)
+    if d2cmd is None:
+        # no binary: fall back to whatever is committed,
+        # else signal the caller to emit the raw source.
+        if out.exists():
+            log.info(
+                f'no d2 binary; using committed svg '
+                f'for {src.name}'
+            )
+            return RenderResult.FELL_BACK
+        return RenderResult.NO_OUTPUT
+    out.parent.mkdir(
+        parents=True,
+        exist_ok=True,
+    )
+    # render into a sibling temp-file first so a bad
+    # `d2` exit (or a crash mid-write) leaves any prior
+    # committed SVG fully intact.
+    fd, tmpname = tempfile.mkstemp(
+        dir=str(out.parent),
+        prefix=f'.{out.stem}.',
+        suffix='.svg.tmp',
+    )
+    os.close(fd)
+    tmp = Path(tmpname)
+    argv: list[str] = (
+        d2cmd
+        + list(app.config.d2_args)
+        + [str(src), str(tmp)]
+    )
+    try:
+        proc = sp.run(
+            argv,
+            capture_output=True,
+            text=True,
+            timeout=120,
+        )
+    except (
+        OSError,
+        sp.TimeoutExpired,
+    ) as err:
+        tmp.unlink(missing_ok=True)
+        log.warning(
+            f'd2 invocation failed for {src.name}: '
+            f'{err}'
+        )
+        return RenderResult.FAILED
+    if proc.returncode != 0:
+        tmp.unlink(missing_ok=True)
+        log.warning(
+            f'd2 render error for {src.name}:\n'
+            f'{proc.stderr}'
+        )
+        return RenderResult.FAILED
+    # atomic swap-in of the freshly rendered SVG.
+    os.replace(tmp, out)
+    return RenderResult.OK
+
+
+class D2Diagram(SphinxDirective):
+    '''
+    Render a ``.d2`` source file (path relative to
+    the sphinx srcdir) as an SVG figure.
+
+    '''
+    required_arguments = 1
+    has_content = False
+    option_spec = {
+        'caption': directives.unchanged,
+        'alt': directives.unchanged,
+        'width': (
+            directives.length_or_percentage_or_unitless
+        ),
+        'margin': directives.flag,
+        'class': directives.class_option,
+        'name': directives.unchanged,
+    }
+
+    def run(self) -> list[nodes.Node]:
+        relsrc: str = self.arguments[0]
+        srcdir = Path(self.env.srcdir)
+        src: Path = srcdir / relsrc
+        self.env.note_dependency(relsrc)
+        if not src.exists():
+            err = self.state_machine.reporter.error(
+                f'd2 source not found: {relsrc}',
+                line=self.lineno,
+            )
+            return [err]
+        out: Path = (
+            srcdir
+            / _outdir
+            / f'{src.stem}.svg'
+        )
+        # collision guard: two distinct sources must not
+        # map onto the same output stem within a build.
+        prior: str|None = _seen_outputs.get(out.name)
+        if (
+            prior is not None
+            and
+            prior != relsrc
+        ):
+            err = self.state_machine.reporter.error(
+                f'd2 output collision: {relsrc!r} and '
+                f'{prior!r} both render to '
+                f'{_outdir}/{out.name}; rename one '
+                f'`.d2` stem',
+                line=self.lineno,
+            )
+            return [err]
+        _seen_outputs[out.name] = relsrc
+
+        result: RenderResult = render_svg(
+            self.env.app,
+            src,
+            out,
+        )
+        if result is RenderResult.FAILED:
+            # loud, build-failing (under `-W`) signal; the
+            # prior committed SVG, if any, is untouched.
+            err = self.state_machine.reporter.error(
+                f'd2 render failed for {relsrc} (see '
+                f'build log); the committed svg, if any, '
+                f'was left untouched',
+                line=self.lineno,
+            )
+            return [err]
+        if result is RenderResult.NO_OUTPUT:
+            # last resort: emit the raw d2 source so no
+            # content is ever silently dropped.
+            log.warning(
+                f'no svg available for {relsrc}; '
+                f'emitting d2 source as literal block'
+            )
+            src_text: str = src.read_text()
+            literal = nodes.literal_block(
+                src_text,
+                src_text,
+            )
+            literal['language'] = 'text'
+            return [literal]
+        # OK | FELL_BACK -> embed the SVG figure.
+        img = nodes.image(
+            uri=f'/{_outdir}/{out.name}',
+            alt=self.options.get(
+                'alt',
+                f'd2 diagram: {src.stem}',
+            ),
+        )
+        if width := self.options.get('width'):
+            img['width'] = width
+        # content-hash the rendered svg so the served
+        # `<img src>` carries a `?v=<hash>` cache-buster
+        # (sphinx tags css/js this way but not images);
+        # without it an edited diagram keeps showing the
+        # browser's stale copy at the stable
+        # `_images/<stem>.svg` url on autobuild reload.
+        if out.exists():
+            img['d2_stem'] = out.stem
+            img['d2_cachebust'] = hashlib.sha256(
+                out.read_bytes()
+            ).hexdigest()[:8]
+        fig = nodes.figure()
+        fig += img
+        classes: list[str] = (
+            ['d2-diagram']
+            + self.options.get('class', [])
+        )
+        if 'margin' in self.options:
+            # NB: the bare 'margin' class is what
+            # book-style themes key off for
+            # right-margin placement; our custom css
+            # uses 'd2-margin'.
+            classes += [
+                'margin',
+                'd2-margin',
+            ]
+        fig['classes'] += classes
+        if caption_txt := self.options.get('caption'):
+            (
+                inline_nodes,
+                _msgs,
+            ) = self.state.inline_text(
+                caption_txt,
+                self.lineno,
+            )
+            caption = nodes.caption(
+                caption_txt,
+                '',
+                *inline_nodes,
+            )
+            fig += caption
+        self.add_name(fig)
+        return [fig]
+
+
+def _reset_seen(
+    app: Sphinx,
+) -> None:
+    '''
+    Clear the per-build output-collision map at the
+    start of each build.
+
+    '''
+    _seen_outputs.clear()
+
+
+def _cachebust_d2_images(
+    app: Sphinx,
+    pagename: str,
+    templatename: str,
+    context: dict,
+    doctree,
+) -> None:
+    '''
+    Append a ``?v=<content-hash>`` query to every d2
+    diagram ``<img src>`` in the rendered page ``body``
+    so a browser re-fetches an *edited* SVG instead of
+    its stale cached copy at the stable
+    ``_images/<stem>.svg`` url (sphinx cache-busts
+    css/js this way, but not images).
+
+    Scoped strictly to d2 images (those carrying the
+    `d2_cachebust` attr set in `D2Diagram.run()`); all
+    other markup is left untouched.
+
+    '''
+    if doctree is None or 'body' not in context:
+        return
+    busts: dict[str, str] = {}
+    for img in doctree.findall(nodes.image):
+        if ver := img.get('d2_cachebust'):
+            busts[img['d2_stem']] = ver
+    if not busts:
+        return
+    body: str = context['body']
+    for stem, ver in busts.items():
+        body = re.sub(
+            r'(src="[^"]*?' + re.escape(stem) + r'\.svg)(")',
+            rf'\1?v={ver}\2',
+            body,
+        )
+    context['body'] = body
+
+
+def setup(app: Sphinx) -> dict:
+    app.add_config_value('d2_bin', None, 'env')
+    app.add_config_value('d2_args', [], 'env')
+    app.add_directive('d2', D2Diagram)
+    app.connect('builder-inited', _reset_seen)
+    app.connect('html-page-context', _cachebust_d2_images)
+    return {
+        'version': '0.1.0',
+        # NB: run() writes the rendered SVG during the
+        # READ phase; the temp-file + `os.replace` swap
+        # keeps that atomic so concurrent renders of the
+        # same diagram (under `sphinx-build -j`) can't
+        # tear the output file.
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

docs/_ext/marginalia.py

@@ -0,0 +1,51 @@
+# tractor: distributed structured concurrency.
+'''
+``.. margin::`` - prose-anchored, right-margin asides.
+
+A theme-agnostic vendoring of `sphinx_book_theme`'s
+`Margin` directive: a `docutils` `Sidebar` subclass
+which tags the node with a ``margin`` class; placement
+is then pure CSS (see ``_static/css/custom.css``)
+allowing use on any theme incl. our
+`pydata_sphinx_theme`.
+
+Usage,
+
+.. code:: rst
+
+    .. margin:: An optional title
+
+       Aside content; text, figures, whatever.
+
+'''
+from docutils import nodes
+from docutils.parsers.rst.directives.body import (
+    Sidebar,
+)
+from sphinx.application import Sphinx
+
+
+class Margin(Sidebar):
+    '''
+    Notes/figures placed in the right margin, anchored
+    at the current point in the prose flow.
+
+    '''
+    required_arguments = 0
+    optional_arguments = 1
+
+    def run(self) -> list[nodes.Node]:
+        if not self.arguments:
+            self.arguments = ['']
+        out: list[nodes.Node] = super().run()
+        out[0].attributes['classes'].append('margin')
+        return out
+
+
+def setup(app: Sphinx) -> dict:
+    app.add_directive('margin', Margin)
+    return {
+        'version': '0.1.0',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

docs/_static/css/custom.css

@@ -0,0 +1,185 @@
+/* tractor docs: a minimal black + white skin over
+ * `pydata-sphinx-theme` plus RHS-marginalia + d2
+ * diagram styling.
+ */
+html[data-theme="light"] {
+  --pst-color-primary: #000000;
+  --pst-color-secondary: #3d3d3d;
+  --pst-color-accent: #5a5a5a;
+  --pst-color-link: #000000;
+  --pst-color-link-hover: #5a5a5a;
+  --pst-color-inline-code: #1a1a1a;
+  --pst-color-inline-code-links: #000000;
+}
+html[data-theme="dark"] {
+  --pst-color-primary: #ffffff;
+  --pst-color-secondary: #c9c9c9;
+  --pst-color-accent: #a8a8a8;
+  --pst-color-link: #ffffff;
+  --pst-color-link-hover: #bdbdbd;
+  --pst-color-inline-code: #e8e8e8;
+  --pst-color-inline-code-links: #ffffff;
+}
+/* mono-chrome links: rely on underline for
+ * affordance instead of color.
+ */
+.bd-content a:not(.headerlink) {
+  text-decoration: underline;
+  text-underline-offset: 0.18em;
+}
+/* d2 diagram figures */
+figure.d2-diagram {
+  text-align: center;
+}
+figure.d2-diagram img {
+  max-width: 100%;
+  height: auto;
+}
+/* keep light-rendered svgs legible in dark mode */
+html[data-theme="dark"] figure.d2-diagram img {
+  background: #ffffff;
+  border-radius: 6px;
+  padding: 6px;
+}
+/* prose-anchored right-margin asides (tufte-ish):
+ * float right within the content column on wide
+ * screens, collapse inline on narrow ones.
+ */
+@media (min-width: 960px) {
+  aside.margin,
+  figure.margin,
+  div.margin,
+  figure.d2-margin {
+    float: right;
+    clear: right;
+    width: 44%;
+    margin: 0.2rem 0 1rem 1.4rem;
+    font-size: 0.85rem;
+  }
+}
+/* strip docutils sidebar chrome from margin asides */
+aside.sidebar.margin {
+  border: none;
+  background: transparent;
+  padding: 0;
+}
+aside.sidebar.margin > p.sidebar-title {
+  font-weight: 600;
+  font-size: 0.9rem;
+  margin-bottom: 0.3rem;
+}
+/* landing-page hero logo (inline svg): the linework uses
+ * `fill: currentColor` so it inherits the theme text colour
+ * (auto-flips light<->dark), and the faces are transparent so
+ * the page background shows through. */
+svg.hero-logo {
+  display: block;
+  max-width: 360px;
+  height: auto;
+  color: var(--pst-color-text-base);
+}
+/* 3-up landing hero row: name | logo | tagline, with a centered
+ * sub-tagline beneath. */
+.hero-row {
+  display: flex;
+  align-items: center;
+  /* left-anchored single row; tighter gap so the logo sits over
+   * the sub-line and the tagline over the prose below it (stack
+   * only on mobile, via the media query). */
+  justify-content: flex-start;
+  flex-wrap: nowrap;
+  gap: clamp(0.5rem, 2vw, 1.5rem);
+  margin: 0 0 0.25rem;
+}
+.hero-row svg.hero-logo {
+  /* override the stacked-hero sizing for the inline row */
+  width: clamp(240px, 34vw, 360px);
+  margin: 0;
+}
+.hero-row .hero-tag {
+  margin: 0;
+  /* keep it on a single line beside the logo */
+  max-width: none;
+  white-space: nowrap;
+  font-size: clamp(1rem, 2.1vw, 1.4rem);
+  font-weight: 400;
+  line-height: 1.15;
+  color: var(--pst-color-text-base);
+}
+.hero-row .hero-tag {
+  min-width: 0;
+}
+.hero-sub {
+  /* wrap at the prose width (not the logo's), with a line of
+   * space before the prose section below. */
+  margin: 0 0 4rem;
+  max-width: none;
+  text-align: left;
+  font-size: 1.05rem;
+  color: var(--pst-color-text-muted);
+}
+/* the page carries a single rst <h1> ("tractor") for semantics
+ * + SEO, but the visual title is the hero — so hide the doc
+ * title accessibly (still read by screen readers + search). */
+#tractor > h1 {
+  position: absolute !important;
+  width: 1px;
+  height: 1px;
+  margin: -1px;
+  padding: 0;
+  overflow: hidden;
+  clip: rect(0 0 0 0);
+  clip-path: inset(50%);
+  white-space: nowrap;
+  border: 0;
+}
+/* smaller section headings on the landing only */
+#sixty-seconds-of-why > :is(h1, h2),
+#dig-in > :is(h1, h2),
+#features > :is(h1, h2),
+#where-do-i-start > :is(h1, h2) {
+  font-size: 1.75rem;
+}
+/* extra breathing room before the first landing section */
+#sixty-seconds-of-why {
+  margin-top: 4rem;
+}
+/* pull the section's `tl;dr` margin-note up so its top edge is
+ * level with the heading (default floats it beside the body). */
+#sixty-seconds-of-why aside.margin {
+  margin-top: -3.75rem;
+}
+/* stack the 3-up hero only on real mobile */
+@media (max-width: 640px) {
+  .hero-row {
+    flex-direction: column;
+  }
+  .hero-row .hero-tag {
+    max-width: none;
+  }
+}
+/* navbar brand: the "distributed SC" tagline next to the logo
+ * (the logo `text` value), kept small + muted like a sub-line. */
+.navbar-brand .title {
+  /* match the centered nav tabs (Bootstrap leaves the nav-link
+   * size/weight vars empty → ~1rem / normal); `inline-block` is
+   * the real underline fix — it stops the parent brand-link's
+   * :hover underline from propagating onto the text (a block
+   * child's `text-decoration:none` can't cancel an ancestor's
+   * underline). */
+  display: inline-block;
+  font-size: 1rem;
+  font-weight: 400;
+  text-decoration: none;
+}
+/* it's a brand mark, not a content link — never underline the
+ * brand text (base / hover / focus). */
+.navbar-brand,
+.navbar-brand:hover,
+.navbar-brand:focus,
+.navbar-brand:visited:hover,
+.navbar-brand .title,
+.navbar-brand:hover .title {
+  text-decoration: none !important;
+  border-bottom: 0 !important;
+}

docs/_static/tractor_hero.html

@@ -0,0 +1,462 @@
+<div class="hero-row">
+  <svg class="hero-logo" role="img" aria-label="tractor" version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 2670 1980" style="enable-background:new 0 0 2670 1980;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:currentColor;}
+	.st1{fill:none;}
+</style>
+<g>
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+  <p class="hero-tag">distributed structured concurrency</p>
+</div>
+<p class="hero-sub">a multi-processing runtime built on (and shaped
+entirely like) <a class="reference external"
+href="https://github.com/python-trio/trio">trio</a>.</p>

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docs/api/context.rst

@@ -0,0 +1,134 @@
+Contexts and streaming
+======================
+
+The modern core of ``tractor``: a :class:`Context` links a task in
+one actor to a task in another as a *single* structured concurrency
+(SC) scope stretched across the IPC boundary — errors, results and
+cancellation flow between the pair `exactly like trio`_ tasks under
+a common `nursery`_. Open one with ``Portal.open_context()`` (see
+:func:`tractor._context.open_context_from_portal` in
+:doc:`/api/core`), then optionally bridge a bidirectional
+:class:`MsgStream` between the two tasks.
+
+.. d2:: diagrams/context_handshake.d2
+   :caption: The ``open_context()`` <-> ``ctx.started()`` handshake.
+   :margin:
+   :alt: parent and child actor context handshake sequence
+
+For the guided, example-driven tour see :doc:`/guide/context`; this
+page is the precise API surface.
+
+.. currentmodule:: tractor
+
+The ``@context`` decorator
+--------------------------
+
+.. autofunction:: context
+
+.. note::
+
+   The decorated function **must** declare a parameter annotated
+   ``tractor.Context`` (any param name works); the runtime injects
+   the context instance there on each remote invocation. Pass
+   ``pld_spec`` to type-restrict (and validate) the payloads this
+   endpoint may shuttle — violations raise
+   :class:`MsgTypeError`. See ``examples/typed_payloads.py``.
+
+``Context``
+-----------
+
+.. autoclass:: Context
+   :members: started,
+             wait_for_result,
+             cancel,
+             cid,
+             chan,
+             side,
+             cancel_called,
+             cancelled_caught,
+             cancel_acked,
+             canceller,
+             maybe_error,
+             outcome
+
+.. deprecated:: 0.1.0a6
+
+   ``Context.result()`` warns; use :meth:`Context.wait_for_result`.
+
+.. note::
+
+   A :class:`Context` is **not** a :class:`trio.CancelScope`:
+   :meth:`Context.cancel` requests cancellation of the *remote*
+   peer task and does not cancel the local scope. If *you*
+   requested the cancel, the resulting :class:`ContextCancelled`
+   is absorbed at ``open_context()`` exit; a cancel originating
+   anywhere else (the peer, or a third-party actor recorded in
+   :attr:`ContextCancelled.canceller`) *is* raised locally. This
+   self-vs-cross-cancel rule is the key to writing correct
+   inter-actor teardown logic — see :doc:`/guide/context`.
+
+Bidirectional streaming
+-----------------------
+
+.. autofunction:: tractor._streaming.open_stream_from_ctx
+
+.. note::
+
+   :func:`~tractor._streaming.open_stream_from_ctx` is bound as
+   the **method-alias** ``Context.open_stream()`` — call it as
+   ``async with ctx.open_stream() as stream:``. Both sides of the
+   context must enter it for the dialog to be open.
+
+.. autoclass:: MsgStream
+   :members: send,
+             receive,
+             receive_nowait,
+             aclose,
+             subscribe,
+             ctx,
+             closed
+
+.. note::
+
+   A :class:`MsgStream` is one-shot use: once closed it can never
+   be "re-opened" — open a fresh :class:`Context` instead. Remote
+   end-of-stream surfaces as :class:`StopAsyncIteration` from
+   ``async for``; un-consumed sends overrun the receiver and raise
+   :class:`tractor._exceptions.StreamOverrun` unless the context
+   was opened with ``allow_overruns=True``.
+
+:meth:`MsgStream.subscribe` fans a single IPC stream out to
+multiple *local* tasks via a
+:class:`tractor.trionics.BroadcastReceiver` (see
+:doc:`/api/trionics`); the underlying allocation is idempotent and
+non-reversible for the stream's lifetime. See
+``examples/streaming_broadcast_fanout.py`` for the pattern in
+action.
+
+Legacy one-way streaming
+------------------------
+
+.. autofunction:: stream
+
+.. warning::
+
+   ``@tractor.stream`` and ``Portal.open_stream_from()`` are the
+   *legacy* one-way streaming API kept for backward compat: a
+   plain async-generator function streamed parent-ward with no
+   child-side receive leg. New code should use
+   ``@tractor.context`` + ``ctx.open_stream()`` (bidirectional,
+   SC-linked, typed). Note ``ctx`` is now a reserved param name
+   for ``@context`` endpoints — ``@stream`` functions must use
+   ``stream`` instead, and ``ctx.send_yield()`` is deprecated in
+   favor of :meth:`MsgStream.send`.
+
+.. seealso::
+
+   :doc:`/api/errors` for :class:`ContextCancelled` /
+   :class:`MsgTypeError` semantics, :doc:`/api/msg` for payload
+   typing via ``pld_spec`` and codecs, :doc:`/api/trionics` for
+   the broadcast fan-out machinery, and the guided tours in
+   :doc:`/guide/streaming` + :doc:`/guide/cancellation`.
+
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning

docs/api/core.rst

@@ -0,0 +1,166 @@
+Runtime and spawning
+====================
+
+The core lifecycle API: boot the runtime in your root process,
+spawn trio-"actors" (processes running ``trio.run()`` task trees)
+under a one-cancels-all supervisor, and talk to them through
+portals. This is structured concurrency (SC) applied *transitively*:
+every spawned process is owned by a nursery block and errors
+`always propagate`_. If you can create zombies it **is a bug**.
+
+.. currentmodule:: tractor
+
+Booting the runtime
+-------------------
+
+.. autofunction:: open_root_actor
+
+.. note::
+
+   The env vars ``TRACTOR_LOGLEVEL`` and ``TRACTOR_SPAWN_METHOD``
+   override the ``loglevel`` / ``start_method`` params so you can
+   crank verbosity or swap spawn backends without touching app
+   code. Exactly **one** IPC transport may be enabled per actor
+   (see ``enable_transports`` and :doc:`/api/ipc`).
+
+.. autofunction:: run_daemon
+
+Spawning actors
+---------------
+
+.. d2:: diagrams/actor_tree.d2
+   :caption: A supervised actor (process) tree.
+   :margin:
+   :alt: root actor supervising a tree of subactors
+
+.. autofunction:: open_nursery
+
+.. autoclass:: ActorNursery
+   :members: start_actor,
+             cancel,
+             cancel_called,
+             cancelled_caught
+
+.. note::
+
+   :meth:`ActorNursery.start_actor` (daemon actor + portal) is the
+   blessed spawning primitive; pair it with
+   ``Portal.open_context()`` for SC-linked remote tasks.
+
+One-shot task actors
+--------------------
+
+.. autofunction:: tractor.to_actor.run
+
+.. note::
+
+   :func:`tractor.to_actor.run` (parlance of
+   ``trio.to_thread.run_sync()`` and friends) is the
+   *convenience* one-shot — spawn, run a single task, block on
+   its result, reap — built entirely on
+   :meth:`ActorNursery.start_actor` + :meth:`Portal.run` +
+   :meth:`Portal.cancel_actor`, so don't design around it as the
+   core model. It supersedes the removed (legacy, non-blocking)
+   ``ActorNursery.run_in_actor()``.
+
+.. deprecated:: 0.1.0a6
+
+   ``ActorNursery.cancelled`` warns; use
+   :attr:`ActorNursery.cancel_called` and
+   :attr:`ActorNursery.cancelled_caught`. The ``rpc_module_paths``
+   kwarg is likewise deprecated in favor of ``enable_modules``.
+
+Portals
+-------
+
+A :class:`Portal` "opens a portal" into a peer actor's memory
+domain: you call functions and start SC-linked tasks *over IPC* as
+though they were local, with results, errors and cancellation
+flowing back `exactly like trio`_.
+
+.. autoclass:: Portal
+   :members: run,
+             run_from_ns,
+             open_stream_from,
+             cancel_actor,
+             chan
+
+.. deprecated:: 0.1.0a6
+
+   The str-form ``Portal.run('mod.path', 'fn_name')`` warns;
+   pass a function *object* whose module is listed in the target's
+   ``enable_modules``. ``Portal.channel`` is the legacy spelling
+   of :attr:`Portal.chan`.
+
+.. autofunction:: tractor._context.open_context_from_portal
+
+.. note::
+
+   :func:`~tractor._context.open_context_from_portal` is bound as
+   the **method-alias** ``Portal.open_context()`` — that's the
+   spelling you should actually call:
+   ``portal.open_context(fn, **kwargs)``. See :doc:`/api/context`
+   for the full ``Context`` + ``MsgStream`` API it unlocks.
+
+.. note::
+
+   :meth:`Portal.cancel_actor` cancels the *whole* remote runtime
+   and process (machine-level), not a single task — use
+   :meth:`Context.cancel` for task-level cancellation. Pass
+   ``raise_on_timeout=True`` to get an ``ActorTooSlowError`` you
+   can escalate per SC discipline (see :doc:`/api/errors`).
+
+Clusters
+--------
+
+.. autofunction:: open_actor_cluster
+
+Spawn a *flat* cluster of ``count`` worker actors (default: one
+per core) all serving the RPC ``modules`` list, yielding a
+``dict[str, Portal]`` keyed by actor name. Handy for
+embarrassingly parallel fan-out; see ``examples/quick_cluster.py``.
+
+Runtime introspection
+---------------------
+
+.. autofunction:: current_actor
+
+.. autoclass:: Actor
+   :members: aid,
+             name,
+             uid,
+             is_registrar,
+             is_infected_aio,
+             cancel_soon
+
+.. note::
+
+   :class:`Actor` is the per-process runtime singleton (msg loop,
+   RPC scheduling, IPC server) — you never instantiate it yourself
+   and should normally only touch the identity/introspection
+   surface listed above. The canonical identity type is
+   :attr:`Actor.aid` (a ``tractor.msg.Aid`` struct);
+   :attr:`Actor.uid` is the legacy ``(name, uuid)`` 2-tuple which
+   is still pervasive in logs and error metadata.
+
+.. deprecated:: 0.1.0a6
+
+   ``Actor.is_arbiter`` warns; use :attr:`Actor.is_registrar`.
+   The ``arbiter_addr`` constructor kwarg is deprecated for
+   ``registry_addrs``.
+
+.. autofunction:: current_ipc_ctx
+
+.. autofunction:: is_root_process
+
+.. autofunction:: get_runtime_vars
+
+.. seealso::
+
+   :doc:`/api/context` for the SC-linked remote task API,
+   :doc:`/api/discovery` for finding actors by name, and the
+   guided tours in :doc:`/guide/spawning`, :doc:`/guide/rpc` and
+   :doc:`/guide/context`.
+
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics

docs/api/devx.rst

@@ -0,0 +1,92 @@
+Debugging and devx: ``tractor.devx``
+====================================
+
+Multi-process debugging that actually works: boot the tree with
+``open_root_actor(debug_mode=True)`` (or pass it to
+``open_nursery()``) and any crash or explicit pause in *any* actor
+acquires a tree-global TTY lock and drops you into a
+`pdbp`_-powered REPL — one actor at a time, ``SIGINT`` shielded,
+no garbled terminals. The top-level helpers below are the daily
+drivers; the rest of the toolbox lives under ``tractor.devx``.
+
+.. currentmodule:: tractor
+
+Pausing and post-mortems
+------------------------
+
+.. autofunction:: pause
+
+.. autofunction:: pause_from_sync
+
+.. note::
+
+   :func:`pause_from_sync` needs the `greenback`_ portal: boot
+   with ``open_root_actor(maybe_enable_greenback=True)`` (mind
+   the `performance implications`_). With ``debug_mode`` on, the
+   built-in ``breakpoint()`` is also remapped to a
+   ``tractor``-safe equivalent.
+
+.. autofunction:: post_mortem
+
+.. deprecated:: 0.1.0a6
+
+   ``tractor.breakpoint()`` warns and simply calls :func:`pause`
+   — use :func:`tractor.pause` (async) or
+   :func:`tractor.pause_from_sync` in new code.
+
+Crash handling for CLIs and sync entrypoints
+--------------------------------------------
+
+.. currentmodule:: tractor.devx
+
+.. autofunction:: open_crash_handler
+
+.. autofunction:: maybe_open_crash_handler
+
+.. note::
+
+   Both are *sync* context managers usable before (or without)
+   ``trio.run()`` — wrap your CLI ``main()`` to get a post-mortem
+   REPL on any uncaught exception instead of a bare traceback.
+
+Runtime hang-hunting
+--------------------
+
+.. autofunction:: enable_stack_on_sig
+
+With stackscope_ integration enabled (also via
+``open_root_actor(enable_stack_on_sig=True)`` or the
+``TRACTOR_ENABLE_STACKSCOPE`` env var) a ``SIGUSR1`` triggers a
+full trio task-tree dump from every actor — works on live,
+*non*-debug-mode trees too:
+
+.. code:: sh
+
+   pkill --signal SIGUSR1 -f <part-of-your-cmd>
+
+Dumps also tee to ``/tmp/tractor-stackscope-<pid>.log`` so you
+still get output under captured/CI stdio.
+
+Lower-level debug plumbing
+--------------------------
+
+.. autofunction:: mk_pdb
+
+.. autofunction:: maybe_wait_for_debugger
+
+:func:`maybe_wait_for_debugger` is mainly useful in runtime/test
+code that must avoid tearing down a tree while a child still
+holds the global debug lock.
+
+.. seealso::
+
+   :doc:`/api/errors` for the boxed error types you'll inspect
+   from the REPL, :doc:`/api/core` for the ``debug_mode`` /
+   ``maybe_enable_greenback`` / ``enable_stack_on_sig`` boot
+   flags on :func:`tractor.open_root_actor`, and
+   :doc:`/guide/debugging` for the guided multi-actor REPL tour.
+
+.. _pdbp: https://github.com/mdmintz/pdbp
+.. _greenback: https://greenback.readthedocs.io/en/latest/
+.. _performance implications: https://greenback.readthedocs.io/en/latest/principle.html#performance
+.. _stackscope: https://github.com/oremanj/stackscope

docs/api/discovery.rst

@@ -0,0 +1,67 @@
+Discovery and the registrar
+===========================
+
+Every actor registers its ``(name, uuid)`` and transport addresses
+with a *registrar* actor — by default the root of the tree, or
+whichever actor serves at the ``registry_addrs`` you boot with.
+The discovery API lets any actor look up any other **by name** and
+get back a connected :class:`~tractor.Portal`, giving you
+service-discovery patterns (daemons, service trees, multi-host
+meshes) without hard-coding addresses.
+
+Lookups first scan already-connected peers before RPC-ing the
+registrar, and multihomed results are ranked UDS > local TCP >
+remote TCP. See ``examples/service_daemon_discovery.py`` for the
+canonical daemon + lookup pattern.
+
+.. currentmodule:: tractor
+
+Lookup APIs
+-----------
+
+.. autofunction:: find_actor
+
+.. autofunction:: wait_for_actor
+
+.. autofunction:: query_actor
+
+.. autofunction:: get_registry
+
+.. note::
+
+   :func:`find_actor` yields ``None`` when nothing is registered
+   under the name (or raises with ``raise_on_none=True``);
+   :func:`wait_for_actor` blocks until the name appears;
+   :func:`query_actor` only *looks up* the address without
+   connecting to the target.
+
+The ``Registrar``
+-----------------
+
+.. autoclass:: Registrar
+   :show-inheritance:
+
+A :class:`Registrar` is just an :class:`~tractor.Actor` subtype
+maintaining the name -> addresses table; you rarely touch it
+directly beyond passing ``registry_addrs`` /
+``ensure_registry=True`` to :func:`~tractor.open_root_actor`.
+Check :attr:`Actor.is_registrar <tractor.Actor.is_registrar>` to
+ask "am I it?".
+
+Legacy ``Arbiter`` alias
+------------------------
+
+.. deprecated:: 0.1.0a6
+
+   ``tractor.Arbiter`` survives only as a class alias of
+   :class:`Registrar` and all "arbiter" terminology is replaced
+   by "registrar"/"registry" across the API: ``get_arbiter()`` is
+   removed (use :func:`get_registry`) and the ``arbiter_addr``
+   kwarg is replaced by ``registry_addrs``.
+
+.. seealso::
+
+   :doc:`/api/core` for booting a registrar via
+   ``open_root_actor(registry_addrs=...)``, :doc:`/api/ipc` for
+   the transport/address model the registry stores, and
+   :doc:`/guide/discovery` for the worked walkthrough.

docs/api/errors.rst

@@ -0,0 +1,102 @@
+Errors and cancellation types
+=============================
+
+``tractor`` extends trio's "exceptions `always propagate`_" rule
+across the process boundary: a crash in any actor is serialized as
+an ``Error`` msg, shuttled over IPC, and re-raised in the linked
+parent scope as a *boxed* :class:`RemoteActorError` — preserving
+the original type, traceback text and source-actor identity, even
+across multi-hop relays (a.k.a. "inceptions").
+
+The most-used types below are importable from ``tractor``
+directly; the remainder live in ``tractor._exceptions`` (not yet
+re-exported at top level).
+
+.. currentmodule:: tractor
+
+Boxed remote errors
+-------------------
+
+.. autoexception:: RemoteActorError
+   :members: boxed_type,
+             src_uid,
+             relay_uid,
+             pformat
+
+.. code:: python
+
+   try:
+       async with portal.open_context(ep_fn) as (ctx, first):
+           ...
+   except tractor.RemoteActorError as rae:
+       if rae.boxed_type is ValueError:
+           ...  # remote task raised a `ValueError`
+
+.. autoexception:: ContextCancelled
+   :show-inheritance:
+   :members: canceller
+
+.. note::
+
+   Inspect :attr:`ContextCancelled.canceller` (the requesting
+   actor's uid) to distinguish a *self*-requested cancel (absorbed
+   at ``open_context()`` exit) from a *cross*-actor cancel (raised
+   locally) — the full rules live in :doc:`/api/context`.
+
+Typed-messaging errors
+----------------------
+
+.. autoexception:: MsgTypeError
+   :show-inheritance:
+   :members: bad_msg,
+             expected_msg_type
+
+An "IPC ``TypeError``": a message failed validation against the
+active msg-spec / ``pld_spec`` (see :doc:`/api/msg`). Raised
+sender-side for control msgs (``Started``/``Return``) and
+receiver-side for stream ``Yield`` payloads.
+
+.. autoexception:: tractor._exceptions.StreamOverrun
+   :show-inheritance:
+
+The sender out-paced the receiver's buffer on a
+:class:`~tractor.MsgStream` opened without
+``allow_overruns=True``; subtypes :class:`trio.TooSlowError`.
+
+Transport and runtime errors
+----------------------------
+
+.. autoexception:: TransportClosed
+
+.. autoexception:: ModuleNotExposed
+   :show-inheritance:
+
+Raised when an RPC requests a function from a module not listed
+in the target actor's ``enable_modules`` allowlist —
+capability-style access control, not an import bug on your end ;)
+
+.. autoexception:: tractor._exceptions.NoRuntime
+   :show-inheritance:
+
+Raised by :func:`tractor.current_actor` (and friends) when no
+actor runtime is up in the current process.
+
+.. autoexception:: tractor._exceptions.ActorTooSlowError
+   :show-inheritance:
+
+A peer actor failed to ack a cancel request within the bounded
+wait — the SC-sanctioned escalation signal from APIs like
+``Portal.cancel_actor(raise_on_timeout=True)``. Catch it to
+escalate (e.g. hard-kill via the supervising
+:class:`~tractor.ActorNursery`); never just ignore it, that's how
+zombies happen.
+
+.. seealso::
+
+   :doc:`/api/context` for how cancellation and errors flow
+   through a :class:`~tractor.Context`, :doc:`/api/devx` for
+   crash-handling REPL tooling (``debug_mode``, post-mortems),
+   and :doc:`/guide/cancellation` for the full SC-cancellation
+   story.
+
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate

docs/api/index.rst

@@ -0,0 +1,67 @@
+API reference
+=============
+
+This is the curated reference for ``tractor``'s public surface: the
+names you can import and lean on without reading runtime internals.
+Everything below is re-exported at the top level (``import
+tractor``) unless a page says otherwise; subsystems like
+``tractor.msg``, ``tractor.trionics``, ``tractor.to_asyncio``,
+``tractor.devx`` and ``tractor.log`` are importable as submodules.
+
+``tractor`` is "just trio_" extended across processes: every API
+here is designed to keep the structured concurrency (SC) rules you
+already know from the `trio docs`_ intact across the process
+boundary. If a name isn't documented here it's an internal — expect
+it to change without notice B).
+
+.. currentmodule:: tractor
+
+Most-used names at a glance:
+
+.. autosummary::
+   :nosignatures:
+
+   open_root_actor
+   open_nursery
+   run_daemon
+   ActorNursery
+   Portal
+   context
+   Context
+   MsgStream
+   open_actor_cluster
+   find_actor
+   wait_for_actor
+   get_registry
+   current_actor
+   current_ipc_ctx
+   is_root_process
+   get_runtime_vars
+   RemoteActorError
+   ContextCancelled
+   MsgTypeError
+   pause
+   post_mortem
+   Channel
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Reference pages
+
+   core
+   context
+   discovery
+   errors
+   msg
+   trionics
+   to_asyncio
+   devx
+   ipc
+
+Where to next? If you're new, start with the runtime and spawning
+APIs in :doc:`/api/core`, then graduate to the inter-actor task
+linking model in :doc:`/api/context` — it's the heart of the whole
+system.
+
+.. _trio: https://github.com/python-trio/trio
+.. _trio docs: https://trio.readthedocs.io/en/latest/

docs/api/ipc.rst

@@ -0,0 +1,89 @@
+IPC and logging
+===============
+
+Under every portal, context and stream sits a per-peer
+:class:`~tractor.Channel`: a msgpack-typed messaging link wrapping
+one OS transport connection. Transports are pluggable per actor
+via ``enable_transports=['tcp' | 'uds']`` — TCP is the default,
+UDS (unix domain sockets) gives you port-less, same-host IPC with
+kernel-provided peer credentials for free — and exactly **one**
+transport may currently be enabled per actor.
+
+.. d2:: diagrams/runtime_stack.d2
+   :caption: Where ``Channel`` sits in the runtime stack.
+   :margin:
+   :alt: layered runtime stack from app code down to transports
+
+Addresses are "unwrapped" tuples at the API edges:
+``('host', port)`` for TCP, filesystem-path pairs for UDS. For
+the full layering story — transport protocols, the IPC server,
+address types and the msg loop — see
+:doc:`/explain/architecture`.
+
+.. currentmodule:: tractor
+
+``Channel``
+-----------
+
+.. autoclass:: Channel
+   :members: from_addr,
+             send,
+             recv,
+             aclose,
+             connected,
+             apply_codec,
+             aid,
+             laddr,
+             raddr,
+             closed
+
+.. deprecated:: 0.1.0a6
+
+   ``Channel.uid`` warns; use :attr:`Channel.aid` which carries
+   richer (optional) identity fields beyond the legacy
+   ``(name, uuid)`` pair.
+
+.. note::
+
+   You rarely construct a :class:`Channel` yourself — the runtime
+   hands them out via :attr:`Portal.chan <tractor.Portal.chan>`
+   and :attr:`Context.chan <tractor.Context.chan>`. Treat the
+   send/recv surface as advanced API: normal apps should speak
+   :class:`~tractor.MsgStream` instead.
+
+Choosing a transport
+--------------------
+
+.. literalinclude:: ../../examples/uds_transport_actor_tree.py
+   :caption: examples/uds_transport_actor_tree.py
+   :language: python
+
+Logging
+-------
+
+``tractor.log`` provides the structured, colorized console
+logging used across the runtime — with actor-name + task-aware
+record headers and extra log levels below :data:`logging.DEBUG`
+(``'transport'``, ``'runtime'``, ``'cancel'``, ``'devx'``) for
+spelunking the runtime itself. Use it for your app too: it's
+already distributed-system aware.
+
+.. currentmodule:: tractor.log
+
+.. autofunction:: get_logger
+
+.. autofunction:: get_console_log
+
+.. note::
+
+   The ``TRACTOR_LOGLEVEL`` env var overrides any caller-passed
+   ``loglevel`` (e.g. to ``open_root_actor()``) so you can crank
+   console verbosity without touching code; subactors inherit
+   the root's level by default.
+
+.. seealso::
+
+   :doc:`/explain/architecture` for the transport/server
+   internals, :doc:`/api/discovery` for how channel addresses
+   get registered and found, and :doc:`/api/msg` for the codec
+   layer every channel speaks.

docs/api/msg.rst

@@ -0,0 +1,107 @@
+Typed messaging: ``tractor.msg``
+================================
+
+All inter-actor communication rides a small, strictly-typed
+msgpack wire protocol built from :class:`msgspec.Struct` types —
+the "SC-shuttle" protocol that powers contexts, streams, RPC and
+cancellation. You normally never touch these msg types directly
+(the :class:`~tractor.Context` API speaks them for you) but you
+*do* use this subpackage to define **payload type contracts**: per
+endpoint via ``@tractor.context(pld_spec=...)`` or per channel via
+custom codecs.
+
+Violations of an active msg-spec surface as
+:class:`~tractor.MsgTypeError` (see :doc:`/api/errors`); the full
+typed-payload workflow is shown in ``examples/typed_payloads.py``.
+
+.. currentmodule:: tractor.msg
+
+The protocol message set
+------------------------
+
+.. autosummary::
+   :nosignatures:
+
+   PayloadMsg
+   Aid
+   SpawnSpec
+   Start
+   StartAck
+   Started
+   Yield
+   Stop
+   Return
+   CancelAck
+   Error
+
+``Aid`` (identity handshake) and ``SpawnSpec`` (parent -> child
+init) run at connection setup; ``Start``/``StartAck`` initiate an
+RPC task; ``Started``/``Yield``/``Stop``/``Return`` are the
+:class:`~tractor.Context` dialog phases; ``CancelAck`` and
+``Error`` close the loop on cancellation and (boxed) failure.
+``Msg`` is a legacy alias of ``PayloadMsg``. The union of all of
+the above is exported as ``MsgType`` (also ``__msg_spec__``).
+
+.. automodule:: tractor.msg.types
+   :no-members:
+
+.. currentmodule:: tractor.msg
+
+Codec construction and override
+-------------------------------
+
+.. autofunction:: mk_codec
+
+.. autoclass:: MsgCodec
+   :members: encode,
+             decode,
+             msg_spec
+
+.. autofunction:: mk_dec
+
+.. autoclass:: MsgDec
+   :members: decode,
+             spec
+
+.. autofunction:: apply_codec
+
+.. autofunction:: current_codec
+
+.. note::
+
+   :func:`apply_codec` swaps the codec via a
+   :class:`contextvars.ContextVar` — the override only applies to
+   the *current task* (and tasks it starts), not sibling tasks
+   already running in the actor. Payload-decoding is layered: the
+   outer codec leaves ``.pld`` fields as ``msgspec.Raw`` and each
+   context's payload-receiver decodes them against *its* spec
+   (the "cheap-or-nasty" validation pattern).
+
+Namespace pointers
+------------------
+
+.. autoclass:: NamespacePath
+   :members: from_ref,
+             load_ref,
+             to_tuple
+
+The ``'module.path:obj_name'`` :class:`str`-subtype used to
+address every RPC target function over the wire (same format as
+:func:`pkgutil.resolve_name`).
+
+Pretty structs
+--------------
+
+.. autoclass:: Struct
+   :show-inheritance:
+
+A :class:`msgspec.Struct` subtype with a multi-line pretty
+``__repr__`` — handy as a base for your own IPC payload types so
+crash logs stay readable.
+
+.. seealso::
+
+   :doc:`/api/context` for where ``pld_spec`` typing plugs into
+   the ``@context`` decorator, :doc:`/api/errors` for
+   :class:`~tractor.MsgTypeError` semantics, and
+   :doc:`/guide/msging` for the guided typed-messaging tour.

docs/api/to_asyncio.rst

@@ -0,0 +1,97 @@
+asyncio interop: ``tractor.to_asyncio``
+=======================================
+
+"Infected asyncio" mode: spawn an actor with
+``start_actor(..., infect_asyncio=True)`` and its process runs
+:mod:`trio` as a `guest`_ on top of the :mod:`asyncio` loop —
+letting your trio task tree drive asyncio tasks *in the same
+process* while the rest of the actor tree stays pure trio. Each
+trio <-> asyncio task pair is linked with structured concurrency
+(SC) semantics: error or cancellation on either side tears down
+both, with the cause translated cross-loop.
+
+.. d2:: diagrams/infected_aio.d2
+   :caption: A trio guest driving asyncio tasks in one actor.
+   :margin:
+   :alt: trio guest mode inside an asyncio-infected actor
+
+See ``examples/infected_asyncio_echo_server.py`` for a complete
+worked example.
+
+.. currentmodule:: tractor.to_asyncio
+
+Starting asyncio tasks from trio
+--------------------------------
+
+.. autofunction:: open_channel_from
+
+.. autofunction:: run_task
+
+.. note::
+
+   :func:`open_channel_from` mirrors the
+   ``Portal.open_context()`` handshake: the asyncio side calls
+   ``chan.started_nowait(value)`` and that value pops out as
+   ``first`` on the trio side. :func:`run_task` is the one-shot
+   form — run a single asyncio-compatible coroutine fn and return
+   its result to trio.
+
+The inter-loop channel
+----------------------
+
+.. autoclass:: LinkedTaskChannel
+   :members: send,
+             receive,
+             wait_for_result,
+             subscribe,
+             started_nowait,
+             send_nowait,
+             get,
+             cancel_asyncio_task,
+             closed
+
+.. note::
+
+   The trio side uses the async API
+   (:meth:`LinkedTaskChannel.send` /
+   :meth:`LinkedTaskChannel.receive`); the asyncio side uses the
+   loop-safe sync/await mix
+   (:meth:`LinkedTaskChannel.send_nowait` /
+   :meth:`LinkedTaskChannel.get` /
+   :meth:`LinkedTaskChannel.started_nowait`).
+
+Translated exception types
+--------------------------
+
+Cross-loop failures are re-raised on the *other* side as one of
+these explicit translation types, so you always know which loop
+actually died first:
+
+.. autoexception:: tractor._exceptions.AsyncioCancelled
+
+.. autoexception:: tractor._exceptions.AsyncioTaskExited
+
+.. autoexception:: tractor._exceptions.TrioCancelled
+
+.. autoexception:: tractor._exceptions.TrioTaskExited
+
+.. autoexception:: AsyncioRuntimeTranslationError
+   :show-inheritance:
+
+Guest-mode entrypoint
+---------------------
+
+``run_as_asyncio_guest()`` is the runtime-internal entrypoint that
+boots trio in `guest`_ mode inside an infected actor — you get it
+implicitly via ``infect_asyncio=True`` and shouldn't need to call
+it yourself.
+
+.. seealso::
+
+   :doc:`/api/core` for the ``infect_asyncio`` spawn flag,
+   :meth:`tractor.Actor.is_infected_aio` for runtime
+   introspection, :doc:`/api/devx` for using the debugger from
+   inside asyncio tasks, and :doc:`/guide/asyncio` for the
+   guided tour.
+
+.. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops

docs/api/trionics.rst

@@ -0,0 +1,76 @@
+Trio patterns: ``tractor.trionics``
+===================================
+
+Sugary structured concurrency (SC) patterns for plain :mod:`trio`
+code — **no actor runtime required**. These helpers grew out of
+real distributed-system needs in ``tractor`` apps but every one of
+them works in a single-process program too; import via
+``from tractor import trionics``.
+
+.. currentmodule:: tractor.trionics
+
+Context-manager helpers
+-----------------------
+
+.. autofunction:: gather_contexts
+
+.. autofunction:: maybe_open_context
+
+.. autofunction:: maybe_open_nursery
+
+.. note::
+
+   :func:`gather_contexts` is "a nursery for async context
+   managers": it enters N acms concurrently and yields their
+   values in input order. :func:`maybe_open_context` is the
+   actor-wide cache/multiplex layer on top — the first task pays
+   the acm setup cost, later callers get ``(cache_hit=True, ...)``
+   and share the same value until all users exit.
+
+Broadcast fan-out
+-----------------
+
+.. autofunction:: broadcast_receiver
+
+.. autoclass:: BroadcastReceiver
+   :members: receive,
+             subscribe,
+             aclose
+
+.. autoexception:: Lagged
+   :show-inheritance:
+
+A single-producer, many-consumer broadcast layer over any
+``trio``-style receive channel: non-lossy for the *fastest*
+consumer while slower consumers raise :class:`Lagged` (a
+:class:`trio.TooSlowError` subtype) once they fall behind the
+internal ring. This is exactly the machinery behind
+:meth:`tractor.MsgStream.subscribe` — see
+``examples/streaming_broadcast_fanout.py``.
+
+ExceptionGroup helpers
+----------------------
+
+.. autofunction:: collapse_eg
+
+.. autofunction:: maybe_raise_from_masking_exc
+
+.. note::
+
+   :func:`collapse_eg` "un-nests" single-exception
+   :class:`ExceptionGroup` wrappers from strict-eg ``trio``
+   nurseries so your ``except`` clauses match the original error;
+   :func:`maybe_raise_from_masking_exc` surfaces real errors that
+   would otherwise be masked by :class:`trio.Cancelled` during
+   teardown.
+
+.. seealso::
+
+   :doc:`/api/context` for the IPC-stream consumer of
+   :class:`BroadcastReceiver`, :doc:`/guide/streaming` for
+   fan-out in a worked pipeline, and the `trio docs`_ for the
+   underlying channel and `nursery`_ semantics these helpers
+   compose.
+
+.. _trio docs: https://trio.readthedocs.io/en/latest/
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning

docs/conf.py

@@ -1,105 +1,160 @@
-# Configuration file for the Sphinx documentation builder.
-#
-# This file only contains a selection of the most common options. For a full
-# list see the documentation:
-# https://www.sphinx-doc.org/en/master/usage/configuration.html
+# tractor: distributed structured concurrency.
+'''
+Sphinx config for `tractor`'s documentation.
 
-# -- Path setup --------------------------------------------------------------
+Theme-wise we ride the `pydata_sphinx_theme` (per the
+research + history in #157) skinned to a minimal
+black + white look via `_static/css/custom.css`; see
+the local extensions under `_ext/` for our `.. d2::`
+diagram and `.. margin::` aside directives.
 
-# If extensions (or modules to document with autodoc) are in another directory,
-# add these directories to sys.path here. If the directory is relative to the
-# documentation root, use os.path.abspath to make it absolute, like shown here.
-#
-# import os
-# import sys
-# sys.path.insert(0, os.path.abspath('.'))
+Build locally via,
 
-# Warn about all references to unknown targets
-nitpicky = True
+    uv run --group docs make -C docs html
 
-# The master toctree document.
-master_doc = 'index'
+'''
+from importlib.metadata import version as get_version
+from pathlib import Path
+import sys
 
-# -- Project information -----------------------------------------------------
+# local sphinx extensions live in `_ext/`:
+# - `d2diagrams`: `.. d2::` diagram rendering
+# - `marginalia`: `.. margin::` RHS prose-asides
+sys.path.insert(
+    0,
+    str((Path(__file__).parent / '_ext').resolve()),
+)
+
+# -- project info ---------------------------------
 
 project = 'tractor'
-copyright = '2018, Tyler Goodlet'
+copyright = '2018-2026, Tyler Goodlet'
 author = 'Tyler Goodlet'
+release: str = get_version('tractor')
+version: str = release
 
-# The full version, including alpha/beta/rc tags
-release = '0.0.0a0.dev0'
+# -- general config -------------------------------
 
-# -- General configuration ---------------------------------------------------
-
-# Add any Sphinx extension module names here, as strings. They can be
-# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
-# ones.
 extensions = [
     'sphinx.ext.autodoc',
+    'sphinx.ext.autosummary',
     'sphinx.ext.intersphinx',
+    'sphinx.ext.viewcode',
     'sphinx.ext.todo',
+    # emit a `.nojekyll` so GitHub Pages serves the `_static/`
+    # + `_images/` dirs (Jekyll would otherwise drop `_`-prefixed
+    # paths and break all styling/assets).
+    'sphinx.ext.githubpages',
+    'sphinx_design',
+    'sphinx_copybutton',
+    'sphinxext.opengraph',
+    'sphinx_togglebutton',
+    'd2diagrams',
+    'marginalia',
 ]
-
-# Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
+exclude_patterns = [
+    '_build',
+    # the pypi/gh readme + its standalone generator
+    # sub-project; NOT doc-tree pages.
+    'README.rst',
+    'github_readme',
+    'Thumbs.db',
+    '.DS_Store',
+]
+root_doc = 'index'
+# TODO: flip this on + burn down the (many) warnings
+# from our informal docstring style; see the autodoc
+# readiness notes from the revamp's recon pass.
+nitpicky = False
 
-# List of patterns, relative to source directory, that match files and
-# directories to ignore when looking for source files.
-# This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+# -- autodoc/autosummary --------------------------
 
+autodoc_member_order = 'bysource'
+autodoc_typehints = 'description'
+autosummary_generate = True
 
-# -- Options for HTML output -------------------------------------------------
+# -- intersphinx ----------------------------------
 
-# The theme to use for HTML and HTML Help pages.  See the documentation for
-# a list of builtin themes.
-#
-html_theme = 'sphinx_book_theme'
-
-pygments_style = 'algol_nu'
-
-# Theme options are theme-specific and customize the look and feel of a theme
-# further.  For a list of options available for each theme, see the
-# documentation.
-html_theme_options = {
-    # 'logo': 'tractor_logo_side.svg',
-    # 'description': 'Structured concurrent "actors"',
-    "repository_url": "https://github.com/goodboy/tractor",
-    "use_repository_button": True,
-    "home_page_in_toc": False,
-    "show_toc_level": 1,
-    "path_to_docs": "docs",
-
-}
-html_sidebars = {
-    "**": [
-        "sbt-sidebar-nav.html",
-        # "sidebar-search-bs.html",
-        # 'localtoc.html',
-    ],
-    #     'logo.html',
-    #     'github.html',
-    #     'relations.html',
-    #     'searchbox.html'
-    # ]
+intersphinx_mapping = {
+    'python': (
+        'https://docs.python.org/3',
+        None,
+    ),
+    'trio': (
+        'https://trio.readthedocs.io/en/stable',
+        None,
+    ),
+    # NOTE, msgspec's site doesn't publish an
+    # `objects.inv` (404s) so no intersphinx for it.
+    'pytest': (
+        'https://docs.pytest.org/en/stable',
+        None,
+    ),
 }
 
-# doesn't seem to work?
-# extra_navbar = "<p>nextttt-gennnnn</p>"
+# -- html output ----------------------------------
 
-html_title = ''
+html_theme = 'pydata_sphinx_theme'
+html_title = 'tractor'
+# canonical site root (GitHub Pages); drives <link rel=canonical>,
+# og:url + any future sitemap. Update if a custom domain is added.
+html_baseurl = 'https://goodboy.github.io/tractor/'
 html_logo = '_static/tractor_logo_side.svg'
 html_favicon = '_static/tractor_logo_side.svg'
-# show_navbar_depth = 1
-
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
-
-# Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {
-    "python": ("https://docs.python.org/3", None),
-    "pytest": ("https://docs.pytest.org/en/latest", None),
-    "setuptools": ("https://setuptools.readthedocs.io/en/latest", None),
+html_css_files = ['css/custom.css']
+html_show_sourcelink = False
+html_theme_options = {
+    # theme-adaptive navbar logo: faces transparent, linework
+    # near-black on light / near-white on dark (pydata swaps by
+    # the active theme). Matches the landing hero's wireframe.
+    'logo': {
+        'image_light': '_static/tractor_logo_nav_light.svg',
+        'image_dark': '_static/tractor_logo_nav_dark.svg',
+        'alt_text': 'tractor',
+        # text shown to the right of the navbar logo (à la
+        # polars).
+        'text': 'tractor',
+    },
+    'github_url': 'https://github.com/goodboy/tractor',
+    'navbar_align': 'content',
+    'show_toc_level': 2,
+    'secondary_sidebar_items': {
+        '**': ['page-toc'],
+        'index': [],
+    },
+    'use_edit_page_button': True,
+    'footer_start': ['copyright'],
+    'footer_end': ['theme-version'],
+    'pygments_light_style': 'algol_nu',
+    'pygments_dark_style': 'github-dark',
 }
+html_context = {
+    'github_user': 'goodboy',
+    'github_repo': 'tractor',
+    'github_version': 'main',
+    'doc_path': 'docs',
+}
+
+# -- ext: opengraph -------------------------------
+
+ogp_site_url = 'https://goodboy.github.io/tractor/'
+ogp_use_first_image = True
+
+# -- ext: copybutton ------------------------------
+
+copybutton_prompt_text = r'>>> |\.\.\. |\$ '
+copybutton_prompt_is_regexp = True
+
+# -- ext: todo ------------------------------------
+
+todo_include_todos = True
+
+# -- ext: d2diagrams (local) ----------------------
+
+# normally resolved from PATH or the `D2_BIN` env
+# var; when neither hits, the committed SVGs under
+# `_diagrams/` are used as-is.
+d2_bin = None
+d2_args = []

docs/dev_tips.rst

@@ -1,51 +0,0 @@
-Hot tips for ``tractor`` hackers
-================================
-
-This is a WIP guide for newcomers to the project mostly to do with
-dev, testing, CI and release gotchas, reminders and best practises.
-
-``tractor`` is a fairly novel project compared to most since it is
-effectively a new way of doing distributed computing in Python and is
-much closer to working with an "application level runtime" (like erlang
-OTP or scala's akka project) then it is a traditional Python library.
-As such, having an arsenal of tools and recipes for figuring out the
-right way to debug problems when they do arise is somewhat of
-a necessity.
-
-
-Making a Release
-----------------
-We currently do nothing special here except the traditional
-PyPa release recipe as in `documented by twine`_. I personally
-create sub-dirs within the generated `dist/` with an explicit
-release name such as `alpha3/` when there's been a sequence of
-releases I've made, but it really is up to you how you like to
-organize generated sdists locally.
-
-The resulting build cmds are approximately:
-
-.. code:: bash
-
-    python setup.py sdist -d ./dist/XXX.X/
-
-    twine upload -r testpypi dist/XXX.X/*
-
-    twine upload dist/XXX.X/*
-
-
-
-.. _documented by twine: https://twine.readthedocs.io/en/latest/#using-twine
-
-
-Debugging and monitoring actor trees
-------------------------------------
-TODO: but there are tips in the readme for some terminal commands
-which can be used to see the process trees easily on Linux.
-
-
-Using the log system to trace `trio` task flow
-----------------------------------------------
-TODO: the logging system is meant to be oriented around
-stack "layers" of the runtime such that you can track
-"logical abstraction layers" in the code such as errors, cancellation,
-IPC and streaming, and the low level transport and wire protocols.

docs/diagrams/actor_tree.d2

@@ -0,0 +1,31 @@
+# tractor docs diagram: the hero supervision tree.
+# A process tree of trio-task-trees; every arrow is
+# a parent which *must wait* on its children.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: down
+root: "root actor" {
+  main: "main()"
+  an: "ActorNursery"
+  main -> an: opens
+}
+w0: "subactor\n'worker_0'" {
+  tasks: "trio task tree"
+}
+w1: "subactor\n'worker_1'" {
+  main: "serve()"
+  an: "ActorNursery"
+  main -> an: opens
+}
+gc: "subactor\n'deeper'" {
+  tasks: "trio task tree"
+}
+root.an -> w0: "spawns +\nsupervises"
+root.an -> w1: "spawns +\nsupervises"
+w1.an -> gc: "spawns +\nsupervises"

docs/diagrams/context_handshake.d2

@@ -0,0 +1,33 @@
+# tractor docs diagram: the inter-actor `Context`
+# dialog; tractor's SC-transitive msg protocol as
+# seen from both sides of `Portal.open_context()`.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+shape: sequence_diagram
+parent: "parent task\n(Portal)"
+child: "child actor task\n(@tractor.context fn)"
+parent -> child: "Start: open_context(fn, **kwargs)"
+child -> parent: "StartAck"
+child -> parent: "Started: await ctx.started(value)"
+parent -> child: "Yield: stream.send()"
+child -> parent: "Yield: stream.send()"
+parent -> child: "Stop: stream closed"
+child -> parent: "Return: fn return value"
+# the non-graceful endings: errors/cancels always
+# propagate, both ways (`ContextCancelled` rides in
+# an `Error` msg, hence the `Error: ...` labels).
+"... or, instead of a graceful Return": {
+  parent-initiated: {
+    parent -> child: "ctx.cancel()  |  parent-side error"
+    child -> parent: "Error: ContextCancelled"
+  }
+  child-initiated: {
+    child -> parent: "Error: child raised  |  ContextCancelled"
+  }
+}

docs/diagrams/debug_lock.d2

@@ -0,0 +1,19 @@
+# tractor docs diagram: multi-actor debugger REPL
+# serialization via the root actor's tty lock.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+shape: sequence_diagram
+mary: "subactor 'mary'"
+root: "root actor\n(owns the tty)"
+bob: "subactor 'bob'"
+mary -> root: "tractor.pause(): acquire tty lock"
+root -> mary: "granted: pdb REPL is yours"
+bob -> root: "tractor.pause(): acquire tty lock"
+mary -> root: "continue: release lock"
+root -> bob: "granted: pdb REPL is yours"

docs/diagrams/error_propagation.d2

@@ -0,0 +1,27 @@
+# tractor docs diagram: one-cancels-all error
+# propagation up a (sub-)actor tree; no zombies,
+# no lost errors.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: down
+root: "root actor\n(ActorNursery)"
+gertie: "subactor 'gertie'\n(healthy, gets cancelled)"
+bobbie: "subactor 'bobbie'\nraises NameError"
+root -> gertie: supervises
+root -> bobbie: supervises
+bobbie -> root: "RemoteActorError\n(boxed NameError)" {
+  style: {
+    stroke-dash: 3
+  }
+}
+root -> gertie: "cancel()" {
+  style: {
+    stroke-dash: 3
+  }
+}

docs/diagrams/infected_aio.d2

@@ -0,0 +1,23 @@
+# tractor docs diagram: "infected asyncio" mode;
+# trio runs as a guest on the asyncio loop with
+# SC supervision linking tasks across both.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: down
+sub: "subactor process (infect_asyncio=True)" {
+  aio: "asyncio event loop" {
+    aiotask: "asyncio.Task\naio_echo_server()"
+    trio: "trio (guest mode)" {
+      triotask: "trio task\n@tractor.context fn"
+    }
+    trio.triotask <-> aiotask: "LinkedTaskChannel\n.send()/.receive()"
+  }
+}
+parent: "parent actor (pure trio)"
+parent <-> sub.aio.trio.triotask: "IPC: Context + MsgStream"

docs/diagrams/runtime_stack.d2

@@ -0,0 +1,16 @@
+# tractor docs diagram: the layered runtime view
+# inside any single actor process.
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+grid-rows: 4
+grid-gap: 0
+app: "your app: plain trio tasks + nurseries"
+tractor: "tractor runtime: actors, portals,\ncontexts + streams, RPC"
+ipc: "IPC Channel: msgspec-typed msgs\nover TCP | UDS transports"
+os: "OS: one process per actor"

docs/diagrams/streaming_pipeline.d2

@@ -0,0 +1,27 @@
+# tractor docs diagram: multi-actor streaming
+# pipeline topology from
+# examples/full_fledged_streaming_service.py
+vars: {
+  d2-config: {
+    sketch: true
+    theme-id: 1
+    pad: 16
+    layout-engine: elk
+  }
+}
+direction: right
+s0: "actor 'streamer_0'" {
+  fn: "stream_data(0)"
+}
+s1: "actor 'streamer_1'" {
+  fn: "stream_data(1)"
+}
+agg: "actor 'aggregator'" {
+  fn: "aggregate()"
+}
+main: "root actor" {
+  fn: "main()"
+}
+s0 -> agg: "async for:\nyielded ints"
+s1 -> agg: "async for:\nyielded ints"
+agg -> main: "deduped\nstream"

docs/explain/architecture.rst

@@ -0,0 +1,369 @@
+Anatomy of the runtime
+======================
+
+You can get a long way with ``tractor`` by treating it as "trio_
+with nurseries that spawn processes". But once you start asking
+*where does my msg actually go?*, *which process is that?* or
+*who keeps the phonebook?*, it pays to know how the runtime hangs
+together. This page walks the stack top to bottom.
+
+.. d2:: diagrams/runtime_stack.d2
+   :caption: The four runtime layers inside *every* actor process.
+   :alt: layer cake of app tasks, tractor runtime, IPC, OS process
+   :width: 70%
+
+The layer cake
+--------------
+
+Every actor process is the same four-layer sandwich:
+
+- **your app**: plain ``trio`` tasks, nurseries and cancel
+  scopes; nothing special. ``tractor`` is a `structured
+  concurrency`_ (SC) multi-processing runtime built on trio_ and
+  the whole pitch is that this layer stays *just trio*: no
+  callbacks, no futures, no proxy objects.
+- **the** ``tractor`` **runtime**: a per-process
+  :class:`tractor.Actor` running the msg loop and RPC task
+  scheduler, plus the user-facing primitives layered on it:
+  :class:`tractor.ActorNursery` (spawning + supervision),
+  :class:`tractor.Portal` (calling into a peer) and
+  :class:`tractor.Context` + :class:`tractor.MsgStream`
+  (SC-linked cross-actor task pairs and streaming).
+- **IPC channels**: one :class:`tractor.Channel` per connected
+  peer, each wrapping a ``MsgTransport`` that ships
+  msgspec_-typed msgs over TCP or UDS.
+- **the OS**: one process per actor, started by a swappable
+  spawn backend.
+
+The property that holds it all together: SC composes *through*
+the layers. A crash in a leaf actor's app task unwinds that
+actor's trio tree, ships across its IPC channel as a typed
+``Error`` msg, and unwinds the parent's trio tree in turn — the
+"SC-transitive supervision protocol" from the README's pitch.
+The whole tree cancels and errors like one big trio program; it
+just happens to be spread across processes.
+
+One actor, one process, one ``trio.run()``
+------------------------------------------
+
+A ``tractor`` "actor" is not a green thread, nor an object with
+a mailbox, nor a coroutine: it's one OS process running one
+:func:`trio.run` whose root task boots the runtime machinery —
+msg loop, RPC task scheduler, IPC server — all embodied by a
+single :class:`tractor.Actor` instance.
+
+.. margin:: Shared nothing
+
+   Processes buy you a real `shared nothing architecture`_: no
+   accidentally-shared mutable state, no GIL contention, and
+   every actor can be inspected (or killed) like any other OS
+   process.
+
+You rarely construct an :class:`~tractor.Actor` yourself; the
+runtime makes exactly one per process and you grab it with
+:func:`tractor.current_actor`:
+
+.. code:: python
+
+    import tractor
+
+    actor = tractor.current_actor()  # NoRuntime if none running
+    print(actor.aid.name)   # str name, need not be unique
+    print(actor.aid.uuid)   # uuid4 str, IS unique
+    print(actor.aid.pid)    # the OS pid
+    print(actor.uid)        # legacy (name, uuid) pair
+
+Identity is carried by the ``Aid`` msg-struct (see
+``tractor.msg.types``): a ``name``/``uuid``/``pid`` triple
+exchanged in the very first "mailbox handshake" whenever two
+actors connect. It's what the registrar stores and what shows up
+in logs and proc-titles. The older ``.uid`` 2-tuple of
+``(name, uuid)`` predates ``Aid`` and is still pervasive across
+the codebase; treat it as the legacy spelling of the same
+identity.
+
+If this smells like the `actor model`_, sure — but as the
+README warns, it probably doesn't look like what you *think* an
+actor model looks like, and that's intentional. Here an "actor"
+is purely a runtime-unit-of-abstraction: process +
+``trio.run()`` + IPC machinery.
+
+IPC: channels, transports, addresses
+------------------------------------
+
+Two connected actors talk through a :class:`tractor.Channel`: a
+duplex, per-peer msg pipe. Each ``Channel`` wraps a
+``MsgTransport`` instance which does the wire work: framing,
+encode/decode and the socket itself. The encoding is msgpack
+(via msgspec_) and *every* msg is an instance of one of the
+runtime's tagged-union :class:`msgspec.Struct` types: the
+``Aid`` handshake, ``Start``/``StartAck`` (RPC init),
+``Started``/``Yield``/``Stop``/``Return`` (the ctx dialog
+phases), ``Error``, etc. There is no raw-bytes mode; the
+msg-spec *is* the protocol, which is exactly what lets payloads
+be type-limited per-context (see ``pld_spec`` in
+:doc:`/guide/context`).
+
+Addresses come in two spellings:
+
+- *unwrapped*: the plain-tuple form you pass to user APIs —
+  ``('127.0.0.1', 1616)`` for tcp, or a
+  ``(<filedir>, <filename>)`` path-pair for uds;
+- *wrapped*: the internal ``TCPAddress``/``UDSAddress`` struct
+  types (plus libp2p-style multiaddr helpers over in
+  ``tractor.discovery``).
+
+You only ever need the tuple form; the runtime wraps and
+unwraps at the boundaries.
+
+TCP: the boring default
+***********************
+
+The default transport (``'tcp'``) binds each actor's IPC server
+to loopback ``('127.0.0.1', <random port>)`` unless told
+otherwise, and is the only choice when your tree spans hosts.
+Nothing exotic: ``trio`` TCP streams + length-prefixed msgpack
+framing.
+
+UDS: same-host, creds included
+******************************
+
+Pass ``enable_transports=['uds']`` and actors instead talk over
+unix-domain sockets, with socket files placed in the per-user
+runtime dir (``$XDG_RUNTIME_DIR/tractor/`` on linux, the
+``platformdirs`` equivalent elsewhere). Two perks over tcp on a
+single host:
+
+- no ports to fight over; addrs are just file paths,
+- the kernel snitches on your peer for free: the listening side
+  reads the connector's ``pid`` (plus ``uid``/``gid`` on linux)
+  straight off the socket via ``SO_PEERCRED`` /
+  ``LOCAL_PEERPID`` — no extra handshake msgs required B)
+
+.. warning::
+
+   Socket-file lifetime == listening actor lifetime. On
+   listener teardown the runtime ``os.unlink()``\s the socket
+   file immediately, so any *late* connection attempt (say, a
+   sub-actor racing to deregister with a registrar that's
+   already shutting down) fails with ``FileNotFoundError``.
+   And ofc, UDS is same-host only.
+
+Here's a full actor tree run entirely over uds:
+
+.. literalinclude:: ../../examples/uds_transport_actor_tree.py
+   :caption: examples/uds_transport_actor_tree.py
+   :language: python
+
+Picking a transport
+*******************
+
+Transport choice is per-actor via the ``enable_transports``
+kwarg accepted by :func:`tractor.open_root_actor` (and proxied
+through ``open_nursery()`` when it implicitly boots the
+runtime), plus per-child via
+``ActorNursery.start_actor(enable_transports=...)``. Two rules
+the runtime enforces today:
+
+- exactly ONE transport per actor: multi-transport actors are
+  on the roadmap but currently raise ``RuntimeError``;
+- your ``registry_addrs`` protos must all be in
+  ``enable_transports``: mismatches fail fast with
+  ``ValueError`` instead of (as in darker times) hanging the
+  registrar handshake forever.
+
+Spawn backends
+--------------
+
+How does an actor actually *become* a process? Via a swappable
+spawn backend, selected with the ``start_method`` kwarg to
+:func:`tractor.open_root_actor`:
+
+``'trio'`` (default)
+   The home-grown spawner: re-exec the child as
+   ``python -m tractor._child`` using ``trio``'s subprocess
+   machinery, then bootstrap it over the first IPC exchange
+   (the parent ships a ``SpawnSpec`` msg carrying all init
+   state). Supported on all platforms and the most battle
+   tested choice by far.
+
+``'mp_spawn'`` / ``'mp_forkserver'``
+   The stdlib :mod:`multiprocessing` start-methods of the same
+   names (forkserver is posix-only). Mostly interesting for
+   ecosystem compat and start-up-latency tuning.
+
+``'subint'`` (in development, py3.14+)
+   On the roadmap (not yet selectable via ``start_method`` on
+   this release): run each actor as a `PEP 734`_
+   sub-interpreter (``concurrent.interpreters``) driven on its
+   own OS thread *inside the parent process* — interpreter-level
+   shared-nothing isolation with much faster start-up. Yes, this
+   bends the one-actor-one-process rule; the rest of the model
+   is unchanged.
+
+The ``TRACTOR_SPAWN_METHOD`` env-var beats any caller-passed
+``start_method``, so you can swap backends under an unmodified
+app:
+
+.. code:: bash
+
+    TRACTOR_SPAWN_METHOD=mp_forkserver python my_app.py
+
+One current limitation worth knowing: ``debug_mode=True`` (the
+crash-to-REPL machinery) is only supported on backends whose
+child-side runtime is trio-native, e.g. the default ``'trio'``;
+see :doc:`/guide/debugging` for the deats.
+
+The registrar
+-------------
+
+Discovery needs a phonebook. Every actor, as part of boot,
+registers its ``Aid`` and bind-addrs with the *registrar*: an
+otherwise ordinary actor (a :class:`tractor.Registrar`, subtype
+of :class:`~tractor.Actor`) that keeps the name -> addrs table
+for the tree; on graceful exit each actor de-registers itself.
+
+.. margin:: Default registry addrs
+
+   With no ``registry_addrs`` passed:
+
+   - tcp: ``('127.0.0.1', 1616)``
+   - uds: ``registry@1616.sock``
+     in the runtime dir
+
+Who *is* the registrar? Decided at root boot, rendezvous style.
+:func:`tractor.open_root_actor` probes each addr in
+``registry_addrs`` with a quick connect-ping, then:
+
+- **somebody answered**: this root is a plain actor; it
+  registers with the existing registrar and binds random
+  same-proto addrs for its own IPC server;
+- **nobody answered**: this root *becomes* the registrar and
+  binds the registry addrs itself.
+
+So single-program trees need zero config — the root quietly
+self-appoints — while multi-program setups share a registrar by
+pointing every program at the same ``registry_addrs``. Pass
+``ensure_registry=True`` to demand that *this* call create the
+registry; it raises if the addrs are already served.
+
+The lookup APIs — :func:`tractor.find_actor`,
+:func:`tractor.wait_for_actor`, :func:`tractor.query_actor` and
+:func:`tractor.get_registry` — all consult it (after first
+checking already-connected peers):
+
+.. literalinclude:: ../../examples/service_daemon_discovery.py
+   :caption: examples/service_daemon_discovery.py
+   :language: python
+
+If you bump into "arbiter" in old issues or posts: that's the
+legacy name for the same thing, surviving in-code only as the
+``Arbiter = Registrar`` class alias; all current terminology is
+"registrar"/"registry". Fair warning per the README: this is
+still a **very naive** discovery sys (no re-election, no gossip
+protocol... yet) and a registrar is expected to outlive its
+registrants.
+
+Runtime env vars
+----------------
+
+A few env-vars let you re-tune a whole tree *without touching
+app code*; each wins over its corresponding kwarg:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 30 44 26
+
+   * - env-var
+     - effect
+     - vs. kwarg
+   * - ``TRACTOR_LOGLEVEL``
+     - crank (or silence) console-log verbosity for every actor
+       in the tree
+     - beats ``loglevel``
+   * - ``TRACTOR_SPAWN_METHOD``
+     - swap the process spawn backend
+     - beats ``start_method``
+   * - ``TRACTOR_ENABLE_STACKSCOPE``
+     - install the ``SIGUSR1`` task-tree-dump handler in every
+       actor, even outside ``debug_mode`` (see
+       :doc:`/guide/debugging`)
+     - OR'd with ``enable_stack_on_sig``
+
+Spotting actors from your shell
+*******************************
+
+Every sub-actor sets an OS-level proc-title of the form
+``_subactor[<name>@<pid>]`` (via ``setproctitle``, silently
+skipped when not installed) so ``ps``/``htop``/``pstree`` show
+*which actor is which* at a glance. The README's signature
+incantation — watch a tree build and self-destruct live:
+
+.. code:: bash
+
+    $TERM -e watch -n 0.1 "pstree -a $$" \
+        & python examples/nested_actor_tree.py \
+        && kill $!
+
+For scripting there are two stable cmdline markers:
+
+.. code:: bash
+
+    pgrep -fa '_subactor\['     # live, titled sub-actors
+    pgrep -fa 'tractor._child'  # 'trio'-backend children not
+                                # yet (re)titled
+
+The title also lands in the kernel ``comm`` (truncated to ~15
+bytes) which survives into zombie state — that's what
+``tractor``'s own test-harness reapers key off. To be crystal
+clear about the contract though: you should never *need* a
+reaper; if you can create zombie child processes (without using
+a system signal) it **is a bug** — please report it!
+
+Logging
+-------
+
+The runtime logs through a thin adapter over stdlib
+:mod:`logging` that stamps every record with actor + task info.
+Two calls get you going:
+
+.. code:: python
+
+    from tractor.log import get_console_log, get_logger
+
+    log = get_logger(__name__)  # actor/task-aware sub-logger
+    get_console_log('info')     # attach console handler @ level
+
+(or just pass ``loglevel='info'`` to
+:func:`tractor.open_root_actor` and the console handler comes up
+with the runtime).
+
+``tractor`` adds custom levels — and matching logger methods —
+that slot between the stdlib ones so you can dial in *which
+runtime subsystem* you want to hear from: ``.transport()`` (5),
+``.runtime()`` (15), ``.devx()`` (17), ``.cancel()`` (22), plus
+a ``PDB`` (500) level for debugger chatter. E.g.
+``loglevel='cancel'`` plays the whole cancellation chorus while
+staying quiet about transport-layer noise. Beyond that
+``tractor`` isn't opinionated about how you consume logs: it's
+all stdlib ``logging`` underneath.
+
+Where to next?
+--------------
+
+.. seealso::
+
+   - :doc:`/guide/context` — the SC-linked cross-actor task API
+     that rides on every ``Channel``.
+   - :doc:`/guide/debugging` — ``debug_mode``, the multi-process
+     REPL and ``stackscope`` task-tree dumps.
+   - :doc:`/explain/sc-distributed` — *why*
+     one-actor-one-process, and what kind of "actor model" this
+     is (and isn't).
+
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _trio: https://github.com/python-trio/trio
+.. _actor model: https://en.wikipedia.org/wiki/Actor_model
+.. _shared nothing architecture: https://en.wikipedia.org/wiki/Shared-nothing_architecture
+.. _msgspec: https://jcristharif.com/msgspec/
+.. _PEP 734: https://peps.python.org/pep-0734/

docs/explain/index.rst

@@ -0,0 +1,16 @@
+Big ideas
+=========
+The conceptual core of ``tractor``: what *structured
+concurrency* (SC) means once your "tasks" are whole
+processes, and how the runtime is layered to deliver
+that without (much) magic.
+
+If you only read one page in these docs make it
+:doc:`sc-distributed`; if you read two, follow it with
+:doc:`architecture`.
+
+.. toctree::
+   :maxdepth: 2
+
+   sc-distributed
+   architecture

docs/explain/sc-distributed.rst

@@ -0,0 +1,221 @@
+Structured concurrency, across processes
+=========================================
+``tractor`` makes one bet: the discipline that made
+``trio``'s concurrency *readable* — `structured
+concurrency`_ (SC) — works just as well when the
+"tasks" are whole OS processes talking over a wire.
+This page distills what that means, from first
+principles, with as little ceremony as possible.
+
+.. margin:: The canon
+
+   If SC is new to you, the seminal `blog post`_ is
+   still the best hour you'll spend on concurrent
+   programming; the `trio docs`_, wikipedia's SC_
+   page and the diagrams over at libdill-docs_ round
+   it out nicely.
+
+SC in one breath
+----------------
+Structured concurrency is the rule that **concurrency
+gets a scope**: every task is spawned *inside* a block
+(a ``trio`` *nursery*) and that block **cannot exit
+until every task it spawned has finished** — returned,
+errored, or been cancelled.
+
+That one rule buys you the properties you already
+rely on in sequential code,
+
+- a function call is a *black box*: when it returns,
+  everything it started is **done** — no secret
+  background tasks leaking out the sides,
+- an exception **always has somewhere to go**: up the
+  (task) tree to a parent which is, by construction,
+  still there waiting,
+- cancellation has a well defined *shape*: cancel a
+  scope and it flows down to every task inside it,
+  and only those.
+
+In short: your **runtime task tree matches your source
+code's indentation**. Concurrency you can read.
+
+The leap: process-shaped tasks
+------------------------------
+Now swap "task" for "process".
+
+A ``tractor`` *actor* is just a Python process running
+its own ``trio.run()`` — its own private task tree,
+sharing **nothing** with its siblings. You spawn
+actors from an :class:`tractor.ActorNursery`, which
+behaves exactly the way the name implies,
+
+.. code:: python
+
+    async with tractor.open_nursery() as an:
+        portal = await an.start_actor(
+            'worker',
+            enable_modules=[__name__],
+        )
+        ...
+    # ^ block exit == every spawned process has
+    # completed, errored or been cancelled, and
+    # been **reaped**. No exceptions, no zombies.
+
+so the whole program becomes a *tree of process-trees*
+— a `supervision tree`_ in erlang-speak — where every
+arrow means "spawned by, **waited on by**, and
+supervised by".
+
+.. d2:: diagrams/actor_tree.d2
+   :caption: A ``tractor`` program: a process tree of
+       ``trio`` task trees; every parent **must wait**
+       on its children.
+   :width: 85%
+
+Causality: no process outlives its parent
+-----------------------------------------
+The stdlib's ``multiprocessing`` (and most "job
+queue" systems) treat child processes as
+fire-and-forget by default: orphans, zombies, lost
+tracebacks and ``kill -9`` cleanup scripts are *your*
+problem. ``tractor`` instead inherits ``trio``'s
+`causality`_ discipline,
+
+- **no spawning willy-nilly**: every actor is born
+  from a nursery block with a known parent,
+- **lifetimes nest**: a sub-actor's entire process
+  tree lives strictly inside its parent's nursery
+  scope,
+- **teardown is guaranteed**: when a scope exits (or
+  errors, or is cancelled) the runtime SIGINTs,
+  waits, and (only if it must) hard-kills + reaps
+  everything underneath.
+
+We take the zombie thing personally: *if you can
+create orphaned child processes without using a
+system signal, it* **is a bug** — and there's a test
+suite to back that sentence up.
+
+Errors always propagate (yes, across the wire)
+----------------------------------------------
+In ``trio``, an exception in any task tears through
+its nursery to a parent that must handle it —
+`exceptions always propagate`_. ``tractor`` extends
+the same guarantee across process boundaries: an
+uncaught error in a remote task is
+
+1. captured + serialized in the child,
+2. shipped home over IPC as a typed ``Error`` msg,
+3. re-raised in the parent **boxed** as a
+   :class:`tractor.RemoteActorError` carrying the
+   original type (``.boxed_type``), a rendered remote
+   traceback, and the erroring actor's id,
+
+while the supervising nursery applies its (currently
+*one-cancels-all*, just like ``trio``) strategy to any
+sibling actors. A crash three processes deep arrives
+at your shell as one coherent, causal traceback chain
+— not a silent dead worker and a stuck queue.
+
+Cancellation is a request, supervision is the rule
+--------------------------------------------------
+Cancellation likewise keeps ``trio``'s semantics
+*verbatim*, just transported: cancelling an actor
+nursery (or a single :class:`tractor.Context` between
+two tasks in different processes) sends an explicit
+cancel **request** over IPC which the remote runtime
+translates into a real ``trio`` cancel-scope cancel —
+then *acks back* so the requester can await
+confirmation within a bounded time. Nothing is ever
+"just killed" first; graceful always precedes brutal.
+
+Because every cross-process dialog is a pair of
+**linked tasks** — one on each side, each inside its
+own cancel scope — SC stays *transitive*: supervision
+doesn't stop at the process boundary, it tunnels
+through every hop of the tree. The wire protocol that
+enforces this (a small set of typed msgs:
+``Start``/``Started``/``Yield``/``Stop``/``Return``/
+``Error``) is detailed in :doc:`/guide/msging` and
+:doc:`/guide/context`.
+
+Hold up, is this an "actor model"?
+----------------------------------
+Let's stop and ask how many canon actor model papers
+you've actually read ;)
+
+From our experience many "actor systems" aren't really
+"actor models" since they **don't adhere** to the `3
+axioms`_ and pay even less attention to the problem of
+`unbounded non-determinism`_ — which was the whole
+point for creating the model in the first place.
+
+From `the author's mouth`_, the **only** requirement
+is `adherence to`_ the `3 axioms`_::
+
+    In response to a message, an actor may:
+
+    - send a finite number of new messages
+    - create a finite number of new actors
+    - designate a new behavior to process subsequent
+      messages
+
+Want to debate whether that makes us a "real" actor
+model? Chime in on our chat, or on one of these issues
+*after you've read everything in them* ;)
+
+- `#210 <https://github.com/goodboy/tractor/issues/210>`_
+- `#18 <https://github.com/goodboy/tractor/issues/18>`_
+
+``tractor`` adheres — actors exchange msgs, spawn
+actors, and swap behaviors — **with no extra API** to
+learn. What we *don't* copy is the cultural baggage:
+no visible mailboxes, no untyped fire-and-forget
+``send()``, no "let it crash" without a supervisor
+that actually hears about it, and definitely no
+shared-reference *proxy objects* pretending the
+network isn't there. If our "actors" don't look like
+what you expected, that's **intentional**: being an
+actor model is just one property of the system; being
+*structured* is the point.
+
+Why processes at all?
+---------------------
+Python has a GIL; an actor model by definition shares
+no state; so the *process* is the natural runtime
+unit — you get real multi-core parallelism and hard
+memory isolation for free. But the deeper win is
+uniformity: because actors only ever talk via msgs
+over a :class:`tractor.Channel` (TCP, UDS, more to
+come), the **same code** runs your laptop's worker
+pool and a multi-host cluster; "distributed" is a
+deployment detail, not an API.
+
+It's just ``trio``
+------------------
+If you remember one framing, make it this: ``tractor``
+**is just** ``trio`` — with nurseries that can spawn
+processes and streams that can cross them. Same
+nursery discipline, same cancellation semantics, same
+"how was this not always the API?" feeling, one level
+up the process tree.
+
+.. seealso::
+
+   :doc:`/explain/architecture` for how the runtime
+   layers deliver all of the above, and
+   :doc:`/start/quickstart` to feel it in ~20 lines of
+   code.
+
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+.. _trio docs: https://trio.readthedocs.io/en/latest/
+.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
+.. _supervision tree: https://www.erlang.org/doc/design_principles/des_princ.html
+.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
+.. _exceptions always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _the author's mouth: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
+.. _adherence to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
+.. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
+.. _unbounded non-determinism: https://en.wikipedia.org/wiki/Unbounded_nondeterminism

docs/guide/asyncio.rst

@@ -0,0 +1,309 @@
+Infected ``asyncio``
+====================
+``tractor`` is "just trio_", but the Python world is packed with
+libraries that only speak ``asyncio``: websocket stacks, vendor
+SDKs, that one exchange client you can't route around. Rather than
+make you rewrite them, ``tractor`` lets you *quarantine* them inside
+a dedicated subactor which runs both event loops at once, with full
+`structured concurrency`_ (SC) guarantees maintained across the
+loop boundary *and* the process tree.
+
+In the project's own words:
+
+    Yes, we spawn a python process, run ``asyncio``, start ``trio``
+    on the ``asyncio`` loop, then send commands to the ``trio``
+    scheduled tasks to tell ``asyncio`` tasks what to do XD
+
+We call this "infected ``asyncio``" mode: the subactor's stdlib
+loop runs as the *host* with ``trio`` embedded on top in `guest`_
+mode, and your ``trio`` tasks drive ``asyncio`` tasks through
+a linked, SC-supervised, in-memory channel.
+
+.. d2:: diagrams/infected_aio.d2
+   :caption: One process, two schedulers: ``trio`` rides the
+       ``asyncio`` loop as a guest while the parent speaks plain
+       ``tractor`` IPC, none the wiser.
+   :alt: parent actor connected over IPC to a subactor whose
+       asyncio loop hosts trio in guest mode, with a
+       LinkedTaskChannel pairing a trio task to an asyncio task
+
+.. note::
+
+   Infected ``asyncio`` mode is **experimental**: it works (we
+   beat on it plenty) but parts of the API surface and some
+   edge-case semantics are still settling. Got opinions on the
+   interop design? Feel free to sling them in `#273`_!
+
+How the infection takes hold
+----------------------------
+A normal subactor boots by running the ``tractor`` runtime's task
+tree directly under ``trio.run()``. Pass ``infect_asyncio=True``
+at spawn time and the child's entrypoint changes shape entirely:
+
+1. the process starts the stdlib loop via ``asyncio.run()``,
+2. the first ``asyncio`` task calls
+   ``trio.lowlevel.start_guest_run()``, embedding the ``trio``
+   scheduler *inside* the already running ``asyncio`` loop (the
+   upstream `guest`_-mode feature),
+3. the regular ``tractor`` runtime then boots on the guest
+   ``trio`` side and connects back to its parent like any other
+   subactor.
+
+.. margin:: Symptoms
+
+   Looks like your stdlib event loop has caught a case of "the
+   trios"! Don't worry, you'll barely notice; and if anything
+   gets too bad, your parents will know about it B)
+
+Both schedulers interleave in a single thread, no GIL gymnastics
+required. From the rest of the actor tree the infected child is
+indistinguishable from any other actor: same IPC protocol, same
+supervision and cancellation semantics, same zombie-safety
+guarantees. The difference is purely internal: ``trio`` tasks in
+that process can start and drive ``asyncio`` tasks through the
+``tractor.to_asyncio`` API.
+
+Spawning an infected subactor
+-----------------------------
+Just flip the flag on :meth:`tractor.ActorNursery.start_actor`:
+
+.. code:: python
+
+    async with tractor.open_nursery() as an:
+        portal = await an.start_actor(
+            'aio_side',
+            enable_modules=[__name__],
+            infect_asyncio=True,
+        )
+
+The one-shot convenience ``tractor.to_actor.run()`` accepts the
+same flag. The ``to_asyncio`` APIs may **only** be called from
+tasks inside an infected actor; calling them anywhere else raises
+a loud ``RuntimeError``. You can introspect at runtime with
+``tractor.current_actor().is_infected_aio()``.
+
+Linking tasks with ``open_channel_from()``
+------------------------------------------
+The core primitive is :func:`tractor.to_asyncio.open_channel_from`,
+an async context manager which starts your ``asyncio`` function as
+a real ``asyncio.Task`` and yields a two-way channel linking it to
+the calling ``trio`` task:
+
+.. code:: python
+
+    from tractor import to_asyncio
+
+    async with to_asyncio.open_channel_from(
+        aio_main,        # async def aio_main(chan, **kwargs)
+        period=0.5,      # extra kwargs are passed through
+    ) as (chan, first):
+        await chan.send('tick')
+
+The semantics deliberately mirror the inter-actor ``Context``
+handshake from :doc:`/guide/context`:
+
+- the target fn must declare a parameter literally named ``chan``;
+  the runtime injects the shared
+  :class:`~tractor.to_asyncio.LinkedTaskChannel` by keyword.
+- the ``trio`` side blocks at entry until the ``asyncio`` task
+  calls ``chan.started_nowait(value)``; that value is delivered as
+  ``first``, exactly like the ``(ctx, first)`` pair you get from
+  ``Portal.open_context()`` after the child calls
+  ``ctx.started()``.
+- a first value **must** be sent from the ``asyncio`` side or the
+  ``trio`` side will never unblock.
+- on block exit the pair is torn down *together*; neither task can
+  outlive the other (more on this below).
+
+A full example: the echo server
+-------------------------------
+Here's the canonical demo, a round-trip echo service where the
+``asyncio`` task is told what to do by a ``trio`` task which is in
+turn driven over IPC by the root actor:
+
+.. literalinclude:: ../../examples/infected_asyncio_echo_server.py
+   :caption: examples/infected_asyncio_echo_server.py
+   :language: python
+
+What's going on?
+
+- there are three task layers: the root actor's pure ``trio``
+  task, the infected child's ``trio``-side ``@tractor.context``
+  endpoint (``trio_to_aio_echo_server()``), and the child's
+  ``asyncio`` task (``aio_echo_server()``).
+- two ``started``-style handshakes compose: the aio task's
+  ``chan.started_nowait('start')`` unblocks the child's
+  ``open_channel_from()`` entry, then the child relays that same
+  value up via ``await ctx.started(first)`` which unblocks the
+  root's ``open_context()`` entry. Synchronization all the way
+  down, er, up.
+- each round trip flows: root ``stream.send()`` -> IPC -> child
+  ``async for msg in stream`` -> ``chan.send(msg)`` -> aio
+  ``await chan.get()`` -> ``chan.send_nowait()`` -> child
+  ``chan.receive()`` -> ``stream.send(out)`` -> IPC -> root.
+- when the root breaks out of its stream loop and exits the
+  context block, the child's stream ends, its channel block exits,
+  and the ``asyncio`` task is reaped along with it; the final
+  ``portal.cancel_actor()`` then tears down the whole process. No
+  orphaned ``asyncio`` tasks, no zombie procs; if you manage to
+  create either it **is a bug**.
+
+``LinkedTaskChannel``: one channel, two sides
+---------------------------------------------
+The same channel object is shared by both tasks; which methods you
+call depends on which loop schedules your task. The ``trio`` side
+gets a standard ``trio.abc.Channel`` interface while the
+``asyncio`` side gets queue-flavored, mostly-sync methods:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 14 36 50
+
+   * - side
+     - call
+     - what it does
+   * - ``trio``
+     - ``await chan.send(item)``
+     - ship ``item`` to the ``asyncio`` task (enqueues onto an
+       internal ``asyncio.Queue``).
+   * - ``trio``
+     - ``await chan.receive()``
+     - wait for the next value from the ``asyncio`` side; the
+       channel also supports ``async for``.
+   * - ``trio``
+     - ``await chan.wait_for_result()``
+     - block until the ``asyncio`` task completes; return its
+       final result or raise its (translated) error.
+   * - ``trio``
+     - ``chan.subscribe()``
+     - acm yielding a ``BroadcastReceiver`` so N local tasks can
+       each consume a copy of the inbound stream (see below).
+   * - ``trio``
+     - ``chan.cancel_asyncio_task()``
+     - explicitly request cancellation of the linked ``asyncio``
+       task.
+   * - ``asyncio``
+     - ``chan.started_nowait(value)``
+     - deliver the "first" value; unblocks the ``trio`` side's
+       ``open_channel_from()`` entry (mirrors ``ctx.started()``).
+   * - ``asyncio``
+     - ``await chan.get()``
+     - wait for the next value sent from the ``trio`` side.
+   * - ``asyncio``
+     - ``chan.send_nowait(item)``
+     - push a value to the ``trio`` side without blocking.
+
+Fan-out with ``.subscribe()``
+*****************************
+Just like :meth:`tractor.MsgStream.subscribe` does for IPC
+streams, ``chan.subscribe()`` lets multiple local ``trio`` tasks
+each receive *every* value sent from the single ``asyncio`` task:
+
+.. code:: python
+
+    async with chan.subscribe() as bcast:
+        async for msg in bcast:
+            ...
+
+The underlying broadcast machinery is lazily allocated on first
+use and is *not* reversible for the channel's remaining lifetime,
+so only reach for it when you actually want the fan-out.
+
+One-shot calls with ``run_task()``
+----------------------------------
+When you just want a single ``asyncio`` result and no streaming
+dialog, skip the channel ceremony and use
+:func:`tractor.to_asyncio.run_task`:
+
+.. code:: python
+
+    import asyncio
+    from tractor import to_asyncio
+
+    async def aio_fetch(url: str) -> str:
+        await asyncio.sleep(0.3)   # pretend-IO, aio style
+        return f'<html>sup {url}</html>'
+
+    # from any trio task inside the infected actor:
+    page = await to_asyncio.run_task(aio_fetch, url='https://x.io')
+
+It schedules the fn as an ``asyncio.Task``, waits for completion
+and hands the return value back to ``trio``; think of it as the
+cross-loop sibling of ``tractor.to_actor.run()``. Errors and
+cancellation are translated exactly as for channels.
+
+Cross-loop errors and cancellation
+----------------------------------
+The paired tasks are *SC linked*: exception and cancel handling
+tears down **both** sides on any unexpected error or cancellation,
+in either loop. There is no fire-and-forget mode; a
+``LinkedTaskChannel`` is a supervision scope just like a
+``Context`` is across processes.
+
+Because each loop has its own (incompatible) cancellation and exit
+machinery, boundary crossings are translated into dedicated
+exception types, all importable from ``tractor.to_asyncio``:
+
+.. list-table::
+   :header-rows: 1
+   :widths: 26 22 52
+
+   * - exception
+     - raised in
+     - meaning
+   * - ``AsyncioCancelled``
+     - the ``trio`` task
+     - the linked ``asyncio`` task was cancelled by itself or
+       a 3rd party (i.e. *not* by the ``trio`` side).
+   * - ``AsyncioTaskExited``
+     - the ``trio`` task
+     - the ``asyncio`` task returned/exited early while the
+       ``trio`` side still held the link open.
+   * - ``TrioCancelled``
+     - the ``asyncio`` task
+     - the ``trio`` side was cancelled (or crashed) so the
+       ``asyncio`` task is being torn down per SC rules.
+   * - ``TrioTaskExited``
+     - the ``asyncio`` task
+     - the ``trio`` side exited gracefully while the ``asyncio``
+       task was still running; a "clean shutdown" signal much
+       like closing a ``trio`` mem-chan.
+
+By default ``open_channel_from(suppress_graceful_exits=True)``
+absorbs the two ``*TaskExited`` signals so happy-path teardown
+stays silent; pass ``False`` when your app wants to handle early
+peer-exit explicitly.
+
+Past the task pair, everything composes with the normal actor
+story: an unhandled ``asyncio`` error is translated into the
+``trio`` side, propagates out of your ``@tractor.context``
+endpoint, and arrives at the parent boxed as
+a :class:`tractor.RemoteActorError`. One SC discipline,
+end-to-end, across loops *and* processes.
+
+Breakpoints in ``asyncio`` tasks
+--------------------------------
+Yes, the multi-actor REPL works here too. With
+``debug_mode=True`` enabled on your tree the ``trio`` side of an
+infected actor can ``await tractor.pause()`` as usual, and with
+greenback enabled (``maybe_enable_greenback=True``) even the
+builtin ``breakpoint()`` works from *inside* ``asyncio`` tasks;
+see ``examples/debugging/asyncio_bp.py`` for the full tour. The
+root-TTY locking dance behind all this is covered in
+:doc:`/guide/debugging`.
+
+Where to next?
+--------------
+.. seealso::
+
+   - :doc:`/guide/context` for the inter-actor handshake and
+     streaming APIs which this whole interop layer mirrors.
+   - :doc:`/guide/msging` for typing the payloads you shuttle
+     between actors (and loops).
+   - :doc:`/guide/debugging` for the multi-process REPL that
+     keeps working even when your loop has "the trios".
+
+.. _trio: https://github.com/python-trio/trio
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _guest: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
+.. _#273: https://github.com/goodboy/tractor/issues/273

docs/guide/cancellation.rst

@@ -0,0 +1,287 @@
+Cancellation and error propagation
+==================================
+
+``tractor`` supports ``trio``'s cancellation_ system *verbatim*,
+then extends it across process boundaries. If you know how to
+cancel a task in ``trio`` you already know how to cancel an actor —
+and its whole subtree — in ``tractor``; the runtime's job is making
+that statement hold over IPC with every structured concurrency (SC)
+guarantee intact.
+
+The ground rules,
+
+- a remote actor is **never** cancelled unless explicitly requested
+  (by a parent or peer), unless supervision demands it (an error
+  triggered one-cancels-all teardown), or unless there's a bug in
+  ``tractor`` itself (please report it!),
+- (remote) errors `always propagate`_ back to the parent
+  supervisor; nothing is silently dropped on the floor,
+- every spawned process gets reaped no matter how it dies; if you
+  can create a zombie child process (without using a system signal)
+  it **is a bug**.
+
+``trio`` cancellation, across the wire
+--------------------------------------
+
+Locally everything is bog-standard ``trio``: nurseries, cancel
+scopes, timeouts. ``tractor`` adds exactly one twist: a cancel
+scope can't physically reach into another process, so the runtime
+*relays cancellation as messages*. Concretely,
+
+- cancelling an *actor* means sending it a runtime-cancel request
+  msg; the target then runs its own graceful teardown — cancelling
+  RPC tasks, closing channels, exiting its :func:`trio.run` — and
+  acks the request back to the canceller,
+- cancelling a single *cross-actor task* works through the
+  :class:`tractor.Context` layer: each ``ctx`` task-pair is
+  cancel-scope-linked over IPC such that either side erroring or
+  cancelling relays an equivalent error to the other side (see
+  :doc:`/guide/context` for the gory details),
+- a cancel is therefore always a *request with an ack*: the
+  canceller does a **bounded wait** for confirmation and escalates
+  if the peer is unresponsive (see the teardown ladder below).
+
+One-cancels-all supervision
+---------------------------
+
+An :class:`tractor.ActorNursery` supervises subactors `exactly like
+trio`_ nurseries supervise tasks: when one child errors, the error
+propagates to the supervising block and **all** sibling subactors
+get cancelled before the error continues bubbling up the (process)
+tree.
+
+.. d2:: diagrams/error_propagation.d2
+   :caption: One-cancels-all: no zombies, no lost errors.
+   :alt: error propagation up a subactor tree
+   :width: 80%
+
+.. literalinclude:: ../../examples/remote_error_propagation.py
+   :caption: examples/remote_error_propagation.py
+   :language: python
+
+What's going on here?
+
+- three healthy actors are spawned as daemons via
+  :meth:`tractor.ActorNursery.start_actor`; left alone they'd
+  happily idle forever,
+- a fourth actor runs ``assert_err()`` via a blocking
+  ``tractor.to_actor.run()`` one-shot and promptly trips its
+  ``assert 0``,
+- the resulting ``AssertionError`` ships back over IPC as a
+  serialized error msg and re-raises *boxed* right at the call
+  inside the nursery block as a
+  :class:`tractor.RemoteActorError`,
+- the nursery reacts like any ``trio`` nursery would: it cancels
+  the three healthy siblings (graceful runtime-cancel requests,
+  acks awaited), reaps all four processes, then re-raises,
+- ``trio.run(main)`` sees that same ``RemoteActorError`` in the
+  parent-most process — propagation is end-to-end or bust.
+
+This one-cancels-all style is currently the *only* supervision
+strategy offered (it's the one ``trio`` gives you); more
+`erlang strategies`_ are roadmap, see the bottom of this page.
+
+The boxed-error bestiary
+------------------------
+
+All remote failures arrive locally as one of a small set of
+exception types, each carrying enough metadata to work out *who*
+failed, *where*, and *why*.
+
+``RemoteActorError``
+********************
+
+The workhorse: a "boxed" exception relayed over IPC from another
+actor. The original error's type, traceback string and msgdata are
+preserved so you can pattern-match on what actually went wrong
+remotely,
+
+- ``.boxed_type``: the reconstructed **type** of the original
+  remote exception (``ValueError``, ``NameError``, what have you),
+- ``.src_uid``: the ``(name, uuid)`` pair of the actor where the
+  error *originated*,
+- ``.relay_uid`` / ``.relay_path``: when an error crosses more than
+  one actor boundary (grandchild -> child -> root) every relaying
+  actor is recorded; multi-hop boxings are lovingly referred to as
+  "inceptions" in the runtime internals,
+- ``.pformat()``: a rich "tb box" rendering of the remote traceback
+  for your logs or REPL.
+
+.. code:: python
+
+    try:
+        async with portal.open_context(ep) as (ctx, first):
+            ...
+    except tractor.RemoteActorError as rae:
+        if rae.boxed_type is ValueError:
+            ...  # the remote task raised `ValueError`
+
+``ContextCancelled``
+********************
+
+The cancel-ack for a cross-actor task pair: raised when a
+:class:`tractor.Context` task is cancelled *by request*. Its
+``.canceller`` attr is the uid of the actor which **requested** the
+cancel, which powers the key rule,
+
+- if **you** requested it (you called
+  :meth:`tractor.Context.cancel`) the resulting ctxc is *absorbed*
+  at ``open_context()`` exit: an expected outcome, not an error,
+- if **anyone else** did — the peer task, or some third-party actor
+  — it *raises* locally so your code always hears about it.
+
+The full self- vs. cross-cancel semantics are a core teaching point
+of :doc:`/guide/context`; go read them there.
+
+``MsgTypeError``
+****************
+
+An IPC-payload "type error": a msg violated the dialog's declared
+payload spec. See :doc:`/guide/msging` for the typed-messaging
+system which enforces it.
+
+``TransportClosed``
+*******************
+
+The underlying IPC transport (TCP stream, UDS socket, ...) died or
+closed out from under a channel. You'll normally only see this
+surface when a peer hard-exits without any graceful runtime
+teardown; the supervision machinery treats unexpected transport
+loss on a busy channel as a failure and tears down accordingly.
+
+Pick your blast radius
+----------------------
+
+Three cancel surfaces, three scopes of effect; choose the smallest
+hammer that does the job.
+
+.. list-table::
+   :header-rows: 1
+   :widths: 36 34 30
+
+   * - surface
+     - cancels
+     - typical use
+   * - :meth:`tractor.ActorNursery.cancel`
+     - every subactor in the nursery
+     - whole-tree teardown
+   * - :meth:`tractor.Portal.cancel_actor`
+     - one actor: full runtime + proc
+     - daemon teardown
+   * - :meth:`tractor.Context.cancel`
+     - exactly one remote task
+     - surgical task cancel
+
+``ActorNursery.cancel()``
+*************************
+
+The big red button: gracefully cancel every subactor supervised by
+the nursery, in parallel, with the escalation discipline below
+applied per-child. It's invoked for you whenever an error hits the
+nursery block (one-cancels-all); call it yourself for an orderly
+early shutdown. Passing ``hard_kill=True`` skips the graceful phase
+and goes straight to OS-level process termination — rarely what you
+want outside tests.
+
+``Portal.cancel_actor()``
+*************************
+
+Cancel one **whole actor**: its entire runtime, every task it's
+scheduled, and (for subactors) the OS process, via a graceful
+runtime-cancel request,
+
+.. code:: python
+
+    await portal.cancel_actor()    # bounded wait, bool result
+    await portal.cancel_actor(
+        raise_on_timeout=True,     # no ack in time?
+    )                              # -> `ActorTooSlowError`
+
+The wait for the peer's ack is *bounded* (default
+``Portal.cancel_timeout = 0.5`` seconds, tunable per call via
+``timeout=``). By default a missed ack just returns ``False``; with
+``raise_on_timeout=True`` you instead get an ``ActorTooSlowError``
+(from ``tractor._exceptions``) so *your* code can escalate per SC
+discipline — exactly what the nursery's own teardown does
+internally before resorting to OS-level signalling.
+
+Note the granularity: this cancels an **actor**, not a task. For
+one remote task use the ``Context`` layer instead.
+
+``Context.cancel()``
+********************
+
+Request cancellation of exactly one remote task: the peer task of
+an open :class:`tractor.Context`. Two things to keep straight,
+
+- it cancels the **remote** side only; a ``Context`` is *not* a
+  :class:`trio.CancelScope` and your local task keeps running until
+  you exit the ``open_context()`` block,
+- the resulting :class:`tractor.ContextCancelled` is absorbed
+  locally (you asked for it, after all) per the self- vs.
+  cross-cancel rule above.
+
+Again, :doc:`/guide/context` covers this dance in depth.
+
+Graceful first, hard as a last resort
+-------------------------------------
+
+.. margin:: REPL-safe by design
+
+   The hard-kill path is *skipped* whenever an actor in the tree
+   holds the debug-REPL lock (``debug_mode=True`` flavors):
+   SIGTERM raining down on a tree mid-``pdb`` session would
+   clobber your prompt. See :doc:`/guide/debugging`.
+
+Every process teardown in ``tractor`` walks the same escalation
+ladder, top rung first,
+
+1. **graceful cancel request**: a runtime-cancel msg over IPC; the
+   target actor cancels its tasks, closes its channels and exits
+   its :func:`trio.run` cleanly,
+2. **soft wait**: the parent waits (bounded) for the child process
+   to exit on its own,
+3. **SIGTERM**: no ack within the bounded wait (internally an
+   ``ActorTooSlowError``) escalates to ``proc.terminate()``,
+4. **SIGKILL ultimatum**: still alive after the hard-kill timeout
+   (~1.6s)? The runtime logs that the "T-800" has been deployed to
+   collect the zombie and issues ``proc.kill()``. No survivors.
+
+The result is the **no-zombies guarantee**: ``tractor`` tries to
+protect you from zombies, no matter what. Quoting the project
+manifesto,
+
+    If you can create zombie child processes (without using
+    a system signal) it **is a bug**.
+
+Run the quickstart's self-destructing process-tree demo
+(``examples/parallelism/we_are_processes.py``, walked through in
+:doc:`/start/quickstart`) under a ``pstree`` watcher and try to
+catch a
+straggler; we'll wait B)
+
+Roadmap: ``erlang``-style strategies
+------------------------------------
+
+One-cancels-all is ``trio``'s strategy and, for now, the only one
+``tractor`` ships. Pluggable `erlang strategies`_ — one-for-one
+restarts, rest-for-one, transient/permanent child specs and friends
+(see the `supervision strategies`_ canon) — are a long-standing
+roadmap item tracked in `#22`_. If supervisors are your jam that
+issue is the place to sling opinions.
+
+.. seealso::
+
+   - :doc:`/guide/context` — the cross-actor task layer where
+     per-task cancellation actually lives,
+   - :doc:`/guide/msging` — the typed msg layer that raises
+     :class:`tractor.MsgTypeError`,
+   - :doc:`/guide/debugging` — what cancellation does (and very
+     carefully does *not* do) while a REPL is up.
+
+.. _cancellation: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-and-timeouts
+.. _exactly like trio: https://trio.readthedocs.io/en/latest/reference-core.html#cancellation-semantics
+.. _always propagate: https://trio.readthedocs.io/en/latest/design.html#exceptions-always-propagate
+.. _erlang strategies: https://learnyousomeerlang.com/supervisors
+.. _supervision strategies: https://www.erlang.org/doc/system/sup_princ.html
+.. _#22: https://github.com/goodboy/tractor/issues/22

docs/guide/clustering.rst

@@ -0,0 +1,127 @@
+Higher-level cluster APIs
+=========================
+
+Sometimes you don't want a hand-crafted supervision tree; you want
+"a pile of workers, one per core, now please". For that there's
+:func:`tractor.open_actor_cluster`: a convenience wrapper which
+spawns a *flat* cluster of subactors and hands you back a portal to
+each,
+
+.. code:: python
+
+    @acm
+    async def open_actor_cluster(
+        modules: list[str],            # RPC allowlist for workers
+        count: int = cpu_count(),      # one per core by default
+        names: list[str]|None = None,  # default: 'worker_{i}'
+        hard_kill: bool = False,       # fwd to `an.cancel()`
+        **runtime_kwargs,              # fwd to `open_root_actor()`
+    ) -> AsyncGenerator[dict[str, tractor.Portal], None]:
+
+A cluster in one block
+----------------------
+
+.. literalinclude:: ../../examples/quick_cluster.py
+   :caption: examples/quick_cluster.py
+   :language: python
+
+Walkthrough,
+
+- ``open_actor_cluster(modules=[__name__])`` concurrently spawns
+  one subactor per detected core (per
+  :func:`multiprocessing.cpu_count`); the ``modules`` list is the
+  usual ``enable_modules``-style capability allowlist so workers
+  may run functions defined in this module,
+- it yields a ``dict[str, tractor.Portal]`` mapping worker name to
+  portal; note the keys get prefixed with the *spawning* actor's
+  name, so from the root you'll see ``'root.worker_0'``,
+  ``'root.worker_1'``, etc.,
+- a plain :class:`trio.Nursery` then fans out one
+  ``portal.run(sleepy_jane)`` per worker; each prints its actor
+  ``.uid`` from inside its own process then naps forever — what
+  runs *inside* each worker (and how many tasks you point at it)
+  is entirely yours to compose,
+- ``tractor.trionics.collapse_eg()`` un-nests the strict
+  ``ExceptionGroup`` wrapping so the demo's ``KeyboardInterrupt``
+  surfaces as itself instead of arriving eg-boxed,
+- on block exit the whole fleet is torn down for you via
+  :meth:`tractor.ActorNursery.cancel`; pass ``hard_kill=True`` at
+  open time to skip straight to OS-level termination instead of
+  the graceful ladder described in :doc:`/guide/cancellation`.
+
+Sizing, naming, fleet-wide options
+----------------------------------
+
+``count`` doesn't have to be core-count and the auto-generated
+``'worker_{i}'`` names are just the default; pass your own (the
+length must match ``count`` or you get a ``ValueError``). Any
+extra ``**runtime_kwargs`` pass through verbatim to
+:func:`tractor.open_root_actor`, so fleet-wide runtime options are
+one kwarg away,
+
+.. code:: python
+
+    async with tractor.open_actor_cluster(
+        modules=['mylib.workers'],
+        count=4,
+        names=['scout', 'miner', 'smelter', 'smith'],
+        debug_mode=True,    # whole-fleet crash-to-REPL
+    ) as portal_map:
+        ...
+
+From here the composition patterns are the usual ``tractor`` fare:
+``portal.run()`` for one-shot calls (as in the demo), or — for a
+persistent bidirectional dialog per worker — concurrently enter N
+``portal.open_context()`` blocks with
+``tractor.trionics.gather_contexts()``; see :doc:`/guide/context`
+for that whole layer.
+
+Clusters vs. nurseries
+----------------------
+
+.. d2:: diagrams/actor_tree.d2
+   :margin:
+   :caption: The general shape: arbitrary nesting. A cluster is
+       this, minus the nesting.
+   :alt: a nested supervision tree of subactors
+
+``open_actor_cluster()`` is sugar, not a new primitive: under the
+hood it's just :func:`tractor.open_nursery` plus N concurrent
+``start_actor()`` calls plus a ``.cancel()`` on the way out. Reach
+for it when,
+
+- you want a *flat*, homogeneous fleet (classic worker-pool or
+  map-style fan-out shapes),
+- "one per core" — or a fixed ``count`` — is the right sizing
+  story,
+- every child can share the same spawn options.
+
+Drop down to a raw :class:`tractor.ActorNursery` when the topology
+gets any fancier: nested trees, heterogeneous children, per-child
+``debug_mode``/transport/module options, daemons mixed with
+one-shot workers, and so on (see :doc:`/guide/parallelism` for a
+hand-rolled pool). Either way the supervision semantics are
+identical: one-cancels-all error propagation and the no-zombies
+guarantee from :doc:`/guide/cancellation` apply to clusters too.
+
+Provisional, by design
+----------------------
+
+.. note::
+
+   APIs in this section are considered **provisional**: the
+   signature and semantics of :func:`tractor.open_actor_cluster`
+   may shift as higher-level supervision machinery lands. We
+   encourage you to try it and provide feedback — the
+   `matrix channel`_ is the place to say hi, and `#22`_ tracks the
+   broader supervisor-strategy roadmap.
+
+.. seealso::
+
+   - :doc:`/guide/parallelism` — worker pools built "by hand" with
+     plain actor nurseries (and why that's easy peasy),
+   - :doc:`/guide/cancellation` — the teardown machinery a cluster
+     inherits for free.
+
+.. _matrix channel: https://matrix.to/#/!tractor:matrix.org
+.. _#22: https://github.com/goodboy/tractor/issues/22

docs/guide/context.rst

@@ -0,0 +1,344 @@
+The ``Context``: a cross-actor task pair
+=========================================
+
+If you've written any trio_ you already know the contract: every
+task lives in a nursery, errors always propagate, cancellation is
+scoped, and nothing leaks. ``tractor`` extends that exact contract
+*across processes* — the same guarantees from the seminal
+`blog post`_, just with the nursery split across two memory
+domains. The primitive that does it is :class:`tractor.Context`: a
+**linked pair of tasks**, one in each of two actors, supervised as
+a single `structured concurrency`_ (SC) scope over IPC.
+
+.. d2:: diagrams/context_handshake.d2
+   :caption: The SC-transitive supervision protocol, msg by msg.
+   :alt: sequence diagram of the context handshake msg flow
+
+Pretty much everything else is (or is slated to be) built on this
+one primitive: ``tractor.to_actor.run()`` is a convenience for
+"spawn, run the lone task, await the result, tear down"; plain
+``Portal.run()`` RPC is planned to be re-implemented on top of it;
+the multi-process debugger's tree-wide REPL lock rides one. Grok
+this page and the rest of the library reads as convenience
+wrappers B)
+
+The endpoint contract
+---------------------
+
+A context endpoint is an async function decorated with
+:func:`tractor.context` which declares **a param annotated**
+``tractor.Context`` — any param name you like, the annotation is
+what's required:
+
+.. code:: python
+
+    @tractor.context
+    async def trainer(
+        ctx: tractor.Context,
+        model: str,
+    ) -> str:
+        await ctx.started('ready')
+        return f'trained {model}'
+
+.. margin:: Who am I talking to?
+
+   Inside any context task
+   :func:`tractor.current_ipc_ctx` returns the
+   ``Context`` bound to the current task; handy
+   in helpers that don't take ``ctx`` explicitly.
+
+The parent (aka "opener") side invokes it through a
+:class:`tractor.Portal` using ``Portal.open_context()``, passing
+any extra kwargs which are shipped over the wire as the remote
+task's arguments. Since the target fn is referenced by module
+path, that module must be listed in the peer actor's
+``enable_modules`` allowlist — RPC capability is always opt-in.
+
+The decorator also accepts a ``pld_spec``: a type (union) which
+every payload in the dialog is validated against, upgrading your
+msgs to a typed contract enforced via :exc:`tractor.MsgTypeError`.
+Validation strictness follows the "`cheap or nasty`_"
+`(un)protocol`_ pattern: the one-shot ``Started`` payload gets the
+nasty treatment (stringently round-trip checked before it's even
+sent) while high-rate stream payloads stay cheap (checked only
+receiver side).
+
+The handshake, on the wire
+--------------------------
+
+Every context runs one instance of ``tractor``'s "SC-transitive
+supervision protocol": a tiny fixed grammar of msgspec_-typed msgs
+encapsulating *all* RPC dialogs between actors. *Transitive*
+because each IPC link obeys the same rules a local nursery does —
+starts are acked, completion is awaited, errors and cancels always
+relay — so chaining links across a process tree composes into one
+tree-wide SC scope.
+
+The figure up top shows a full dialog; in order:
+
+``Start``
+    sent by ``Portal.open_context()``: "schedule a task running
+    this function with these kwargs".
+
+``StartAck``
+    the peer runtime confirms the task is scheduled and that the
+    endpoint really is a context-style fn.
+
+``Started``
+    emitted when the child task calls
+    :meth:`tractor.Context.started`; carries the first payload
+    and unblocks the parent's entry of ``open_context()``.
+
+``Yield``
+    one per :meth:`tractor.MsgStream.send`, flowing in *either*
+    direction while a stream is open.
+
+``Stop``
+    graceful end-of-stream: the far side's ``async for``
+    terminates cleanly.
+
+``Return``
+    the child fn returned; its value becomes the context's final
+    result. If the child raised instead, an ``Error`` msg takes
+    this slot carrying the boxed traceback.
+
+``ctx.started()``: just like ``task_status.started()``
+*******************************************************
+
+The startup phase is a deliberate clone of
+:meth:`trio.Nursery.start` semantics: the child decides when it's
+"up", optionally handing back a first value, and the parent stays
+blocked until that moment:
+
+.. code:: python
+
+    # trio, in-process
+    first = await nursery.start(child_fn)
+
+    # tractor, cross-process
+    async with portal.open_context(child_fn) as (ctx, first):
+        ...
+
+The ``as (ctx, first)`` tuple is exactly that pair: the
+:class:`tractor.Context` handle plus whatever value the child
+passed to ``await ctx.started(value)``. And readiness is not
+optional — for instance opening a stream before ``.started()``
+has been called raises a ``RuntimeError``; handshake first, then
+dialog.
+
+Bidirectional streaming over a context
+--------------------------------------
+
+The canonical ping-pong (design history: `#53`_, `#223`_) — a
+full-duplex msg stream between a parent and its spawned peer:
+
+.. literalinclude:: ../../examples/rpc_bidir_streaming.py
+   :caption: examples/rpc_bidir_streaming.py
+   :language: python
+
+What's going on?
+
+- ``start_actor()`` spawns the daemon-style subactor
+  ``'rpc_server'`` with this very module in its allowlist.
+
+- ``portal.open_context(simple_rpc, data=10)`` fires the
+  ``Start`` msg then blocks until the child task calls
+  ``await ctx.started(data + 1)`` — hence ``sent == 11``.
+
+- both tasks enter ``ctx.open_stream()``: a stream dialog is only
+  fully open once *each* side has entered its block.
+
+- the parent seeds the first ``'ping'``; each side then echoes
+  the other, one ``Yield`` msg per ``stream.send()``.
+
+- after the 9th pong the parent ``break``\ s (10 pings sent in
+  total) and exits its stream block, which sends ``Stop``; the
+  child's ``async for`` completes gracefully and its ``else``
+  clause asserts all 10 pings arrived.
+
+- the 10th in-transit pong? Discarded by the implicit drain at
+  ``open_context()`` exit, which runs the dialog down to the
+  child's ``Return`` (here ``None``).
+
+- daemon actors live until told otherwise:
+  ``portal.cancel_actor()`` reaps the subactor explicitly.
+
+Results: the ``Return`` leg
+---------------------------
+
+Every context resolves to a final outcome. Wait on it explicitly
+from the parent side:
+
+.. code:: python
+
+    async with portal.open_context(ep) as (ctx, first):
+        ...
+        result = await ctx.wait_for_result()
+
+or just exit the block — ``__aexit__`` implicitly drains the msg
+flow until the ``Return`` (or ``Error``) arrives, discarding any
+in-transit ``Yield``\ s on the way. Either way the rule of
+`causality`_ holds exactly as in a local nursery: **the opener
+never unblocks before the remote task is done**.
+
+For post-hoc inspection (think supervision/restart logic) the ctx
+also exposes ``Context.outcome``, ``.maybe_error`` and
+``.has_outcome`` — where a "result" might well be the error the
+dialog ended with.
+
+Cancellation semantics
+----------------------
+
+The part you actually came for; read it twice B)
+
+A context's two tasks are **cancel-scope-linked across the IPC
+boundary**: whatever ends one side — error, cancellation, plain
+old return — is relayed such that the other side ends
+equivalently. No silent half-open dialogs, no orphaned remote
+tasks, ever.
+
+``ctx.cancel()`` cancels the *remote* task
+*******************************************
+
+:meth:`tractor.Context.cancel` requests cancellation of the
+**remote** task only:
+
+.. code:: python
+
+    async with portal.open_context(ep) as (ctx, first):
+        await accomplish_things(ctx)
+        await ctx.cancel()  # remote task, NOT me
+
+A :class:`tractor.Context` is **not** a :class:`trio.CancelScope`:
+the call doesn't (and can't) cancel your local task. It sends the
+cancel request and waits a bounded ``timeout`` for the peer
+runtime's ``CancelAck``, then your code proceeds to the block exit
+as normal.
+
+Compare scopes here: ``Portal.cancel_actor()`` is the big hammer
+which cancels the peer's **entire runtime** (and thus process);
+``ctx.cancel()`` is the per-dialog scalpel.
+
+``ContextCancelled`` and the absorption rule
+*********************************************
+
+When a context task gets cancelled *by request* the requestee's
+runtime reports back with a :exc:`tractor.ContextCancelled`
+("ctxc") whose ``.canceller`` field holds the uid of the actor
+which asked. That one field decides what you observe:
+
+**you requested it**
+    i.e. ``ctxc.canceller == tractor.current_actor().uid``: the
+    ctxc is **absorbed** at ``open_context()`` exit — nothing
+    raises in your block. You asked for a graceful stop and got
+    it; if you care, ``await ctx.wait_for_result()`` hands the
+    ctxc back as a plain *value* for inspection.
+
+**anyone else requested it**
+    the peer cancelling itself, or some third actor cancelling it
+    from the side: the ctxc **is raised** in your block. From
+    your scope's perspective a task you depend on was killed out
+    from under you and SC demands you hear about it — exactly
+    like a sibling crash in a `nursery`_.
+
+In code:
+
+.. code:: python
+
+    try:
+        async with portal.open_context(ep) as (ctx, first):
+            ...
+    except tractor.ContextCancelled as ctxc:
+        # can only be a peer- or third-party cancel;
+        # self-requested cancels are absorbed at exit.
+        assert ctxc.canceller != tractor.current_actor().uid
+
+This self- vs cross-cancel split is what makes explicit teardown
+*composable*: a supervisor cancels its dialogs without try/except
+noise, while unexpected cancellation anywhere in the tree still
+propagates loudly like any other failure.
+
+.. warning::
+
+   Once ``ctx.cancel()`` has been called the dialog is done: a
+   subsequent ``ctx.open_stream()`` raises ``RuntimeError``.
+
+For introspection the ctx exposes trio-flavored status props:
+``.cancel_called`` (this side requested), ``.cancel_acked`` (peer
+confirmed), ``.cancelled_caught`` and ``.canceller`` —
+deliberately mirroring :class:`trio.CancelScope` naming.
+
+Errors propagate, both ways
+---------------------------
+
+A crash on either end tears down the pair, SC style:
+
+- **child raises**: the exception ships back as an ``Error`` msg
+  and re-raises in the parent block boxed as a
+  :exc:`tractor.RemoteActorError`; the original class rides along
+  as ``.boxed_type`` with ``.src_uid`` naming the crashed actor.
+
+- **parent raises** (or is cancelled) inside the block: an
+  equivalent error/cancel is relayed to the child task so it can
+  never outlive the dialog.
+
+.. code:: python
+
+    try:
+        async with portal.open_context(ep) as (ctx, first):
+            ...
+    except tractor.RemoteActorError as rae:
+        if rae.boxed_type is ValueError:
+            ...  # remote ValueError, type preserved
+
+Errors that hop through intermediary actors on their way up the
+tree ("inceptions" XD) keep the full relay trail in
+``.relay_uid`` / ``.relay_path``. Payloads violating your declared
+``pld_spec`` surface as the IPC analog of a ``TypeError``:
+:exc:`tractor.MsgTypeError`.
+
+Overruns and backpressure
+-------------------------
+
+Stream msgs land in a bounded per-context buffer on the receiver
+side. A sender that outpaces a non-consuming receiver *overruns*
+it and the runtime raises ``StreamOverrun`` (from
+``tractor._exceptions``; also a :exc:`trio.TooSlowError`) instead
+of buffering without bound — SC discipline applies to memory too.
+
+Your knobs:
+
+- ``msg_buffer_size`` on ``ctx.open_stream()`` sizes the buffer.
+
+- ``allow_overruns=True`` (on ``Portal.open_context()`` and/or
+  ``ctx.open_stream()``) opts in to absorbing overflow instead of
+  erroring — reasonable for bursty telemetry-ish feeds, just know
+  you're trading the error for extra buffering.
+
+One context, one stream
+-----------------------
+
+A ``MsgStream`` is strictly **one-shot use**: once it closes —
+gracefully or not, from either side — it can never be re-opened
+on the same ctx. Want another round with the same peer? Open a
+fresh context; they're cheap. The full close-vs-cancel teardown
+story lives in :doc:`/guide/streaming`.
+
+.. rubric:: Where to next?
+
+:doc:`/guide/streaming` covers the rest of the msg-moving story:
+the legacy one-way API, multi-actor pipelines and in-actor
+broadcast fan-out. For exhaustive API detail see
+:class:`tractor.Context`, :class:`tractor.MsgStream` and
+:exc:`tractor.ContextCancelled`.
+
+.. _trio: https://github.com/python-trio/trio
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
+.. _nursery: https://trio.readthedocs.io/en/latest/reference-core.html#nurseries-and-spawning
+.. _causality: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#c-c-c-c-causality-breaker
+.. _cheap or nasty: https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern
+.. _(un)protocol: https://zguide.zeromq.org/docs/chapter7/#Unprotocols
+.. _msgspec: https://jcristharif.com/msgspec/
+.. _#53: https://github.com/goodboy/tractor/issues/53
+.. _#223: https://github.com/goodboy/tractor/issues/223

docs/guide/debugging.rst

@@ -0,0 +1,545 @@
+.. _debugging:
+
+================================
+"Native" multi-process debugging
+================================
+
+``tractor`` ships the thing every ``multiprocessing`` user has
+wished for and quietly assumed was impossible: a multi-process
+debugger that *just works*.
+
+Drop ``await tractor.pause()`` — or, with `greenback`_ installed,
+a plain builtin ``breakpoint()`` — anywhere in any actor: the
+root, a child, a grandchild, a sync helper function, even an
+``asyncio`` task inside an "infected" actor. A full-featured
+`pdbp`_ REPL opens *in that process*, with syntax-highlighted
+source listings, tab completion and sticky mode, attached to your
+one terminal.
+
+Under the hood every REPL entry acquires a tree-global tty mutex
+via an IPC request to the root actor, so prompts from concurrent
+pauses and crashes never interleave. ``ctrl-c`` is shielded while
+any REPL is live, so a stray ``SIGINT`` can't vaporize the tree
+out from under you. And in debug mode any uncaught error drops
+you into a crash REPL *first in the failing child*, then again at
+each parent as the boxed :class:`~tractor.RemoteActorError` climbs
+the supervision tree.
+
+No remote-pdb sockets, no ``set_trace()`` port juggling, no
+``ptrace`` attach dance: the debugger semantics you already know,
+transparently extended across an entire process tree. Because
+``tractor`` is a `structured concurrency`_ (SC) runtime, the
+debugger composes with supervision instead of fighting it — quit
+a REPL and errors keep propagating exactly like `trio`_ taught
+you, ending in clean, zombie-free teardown.
+
+We're pretty sure it's the (first ever?) "native" debugging UX
+for multi-process Python B)
+
+Enabling debug mode
+-------------------
+
+Pass ``debug_mode=True`` to your runtime entrypoint, either
+:func:`tractor.open_nursery` (which forwards it to the implicitly
+opened root actor) or :func:`tractor.open_root_actor` directly:
+
+.. code:: python
+
+    async with tractor.open_nursery(
+        debug_mode=True,    # arm the whole actor tree
+    ) as an:
+        ...
+
+This arms the debug machinery *tree-wide*:
+
+- crash handling is enabled in every actor: uncaught errors enter
+  a REPL before they propagate,
+- the internal tty-lock module is auto-exposed over RPC to every
+  subactor (this is what makes the one-terminal handoff work),
+- console logging is bumped to include ``PDB``-level status msgs
+  so you can see REPL acquire/release events as they happen.
+
+You can instead flip it on for just one child, letting its
+siblings crash-and-burn the normal way:
+
+.. code:: python
+
+    portal = await an.start_actor(
+        'sketchy_worker',
+        debug_mode=True,    # OR-ed with the tree-wide flag
+    )
+
+See ``examples/debugging/per_actor_debug.py`` for a runnable
+proof of the selective style.
+
+.. note::
+
+   Debug mode requires the child-side runtime to be
+   ``trio``-native so that the tty-lock IPC dialog works; it's
+   currently supported on the ``'trio'`` (default) and
+   ``'main_thread_forkserver'`` spawn backends and raises
+   ``RuntimeError`` for any other ``start_method``.
+
+Your first pause point
+----------------------
+
+:func:`tractor.pause` is the SC-aware, multi-process spelling of
+the stdlib's ``breakpoint()``. In the root actor it looks almost
+boring:
+
+.. literalinclude:: ../../examples/debugging/root_actor_breakpoint.py
+   :caption: examples/debugging/root_actor_breakpoint.py
+   :language: python
+
+Run it and you get a ``(Pdb+)`` prompt parked on the ``pause()``
+line; type ``c`` (continue) and the program finishes normally.
+
+The exact same call works from *any* subactor, no matter how deep
+in the tree:
+
+.. literalinclude:: ../../examples/debugging/subactor_breakpoint.py
+   :caption: examples/debugging/subactor_breakpoint.py
+   :language: python
+
+Each loop iteration the child actor requests the terminal from
+the root over IPC, REPLs you, then releases it on ``c``. Pause
+points are re-entrant-safe: repeat calls from the same task are
+no-op'd and other local tasks queue politely for the REPL.
+
+When you get bored, type ``q`` (quit): the resulting
+``bdb.BdbQuit`` is boxed and shipped to the parent like any other
+remote error XD — causality is preserved even for your debugging
+mistakes.
+
+Crash REPLs: errors climb the tree
+----------------------------------
+
+Pause points are only half the story. With debug mode armed, any
+*uncaught* error anywhere in the tree triggers what we call crash
+handling mode:
+
+.. literalinclude:: ../../examples/debugging/subactor_error.py
+   :caption: examples/debugging/subactor_error.py
+   :language: python
+
+What happens when the child hits that (very intentional)
+``NameError``:
+
+1. a REPL opens **in the crashed child first** — you inspect the
+   raising frame, its locals, the works, right inside the failed
+   process,
+2. when you quit, the error is boxed into a
+   :class:`~tractor.RemoteActorError` and relayed to the parent,
+3. the parent (here the root) gets *its own* crash REPL with the
+   rendered remote traceback,
+4. quit again and the nursery tears the tree down — errors keep
+   propagating per SC rules, no zombies left behind.
+
+You debug the failure at every hop of the supervision tree, which
+for multi-hop trees means you can chase an error from the leaf
+that raised it all the way up to the root that supervises it.
+
+Need to skip REPL entry for certain exceptions? Pass a predicate
+via ``open_root_actor(debug_filter=...)``; by default
+cancellation-only exception (groups) don't engage the REPL.
+
+One terminal, many actors
+-------------------------
+
+So how do N processes share one tty without garbling it? The root
+actor owns stdio for the whole tree and guards it with a FIFO
+mutex; every subactor REPL entry is an IPC lock request to the
+root. Exactly one actor-task in the entire tree can own the
+terminal at a time, so prompts never interleave — ever.
+
+.. d2:: diagrams/debug_lock.d2
+   :caption: Every REPL entry serializes through the root actor's
+       tty lock; ``continue``-ing one REPL hands the terminal to
+       the next waiter, FIFO style.
+   :alt: sequence diagram of two subactors serializing pdb REPL
+       access through the root actor's tty lock
+
+The runtime's teardown paths cooperate too: a cancelling parent
+always waits for any live REPL to release before reaping
+children, so the debugger never gets yanked out from under you
+mid-keystroke.
+
+.. margin:: Watch the tree live
+
+   Run any of these examples with a process-tree watcher in a
+   second terminal and watch actors come and go::
+
+       watch -n 0.1 "pstree -a $$"
+
+Here's the showpiece: one daemon child re-entering
+``tractor.pause()`` forever inside a stream, while its sibling
+repeatedly raises a ``NameError``:
+
+.. literalinclude:: ../../examples/debugging/multi_daemon_subactors.py
+   :caption: examples/debugging/multi_daemon_subactors.py
+   :language: python
+
+What you'll actually see
+************************
+
+Running it looks *roughly* like this (uids, tracebacks and source
+listings elided; REPL order can vary with who wins the lock
+race)::
+
+    $ python examples/debugging/multi_daemon_subactors.py
+
+    Opening a pdb REPL in paused actor: ('bp_forever', '<uuid>')
+    <highlighted source around the `await tractor.pause()` line>
+    (Pdb+) c
+
+    Opening a pdb REPL in crashed actor: ('name_error', '<uuid>')
+    <live traceback: NameError: name 'doggypants' is not defined>
+    (Pdb+) q
+
+    Opening a pdb REPL in crashed actor: ('root', '<uuid>')
+    <boxed RemoteActorError traceback relayed from 'name_error'>
+    (Pdb+) q
+
+Two (then three) processes, one terminal, zero confusion:
+``c``-ing out of the paused daemon's REPL releases the tty lock,
+which immediately hands the prompt to the crashed sibling; quit
+that and the error propagates as a fully-rendered
+:class:`~tractor.RemoteActorError` to the parent where one final
+crash REPL catches it before clean, zombie-free teardown.
+
+For maximum drama run
+``multi_nested_subactors_error_up_through_nurseries.py`` (under
+``examples/debugging/``) which pulls the same trick across a
+*three-deep* process tree — the tty lock keeps every prompt
+orderly the whole way up.
+
+Post-mortem, on demand
+----------------------
+
+Crash handling is automatic, but you can also enter a REPL on
+a live exception *manually* with :func:`tractor.post_mortem` —
+the actor-aware equivalent of ``pdb.post_mortem()`` — from inside
+any ``except`` block in any actor (kwargs: ``tb=`` for an
+explicit traceback, plus ``shield=`` and ``hide_tb=``):
+
+.. literalinclude:: ../../examples/debugging/pm_in_subactor.py
+   :caption: examples/debugging/pm_in_subactor.py
+   :language: python
+
+This example demos three REPL entries from one error:
+
+- the child's manual ``post_mortem()`` inside its ``except``,
+- the runtime's automatic crash handler in the same child once
+  the error re-raises out of the RPC task,
+- a manual ``post_mortem()`` in the parent on the received
+  :class:`~tractor.RemoteActorError`, whose ``.boxed_type``
+  faithfully reports the original ``NameError``.
+
+Pausing from sync code
+----------------------
+
+No ``await``? No problem. :func:`tractor.pause_from_sync` brings
+the same tree-aware REPL to plain synchronous functions — handy
+when the suspect code is three helpers deep and decidedly not
+async.
+
+It's powered by `greenback`_, which is optional, so you need to:
+
+1. install it (it ships in ``tractor``'s ``sync_pause``
+   dependency group),
+2. enable it at runtime entry:
+
+.. code:: python
+
+    async with tractor.open_nursery(
+        debug_mode=True,
+        maybe_enable_greenback=True,
+    ) as an:
+        ...
+
+With that armed, sync code can pause from three different caller
+environments: the main ``trio`` thread, ``trio.to_thread`` bg
+threads, and (see the next section) ``asyncio`` tasks in infected
+actors. The greenback "portal" hops back into the ``trio`` loop
+to do the lock/REPL dance on your behalf:
+
+.. literalinclude:: ../../examples/debugging/sync_bp.py
+   :caption: examples/debugging/sync_bp.py (the sync fn, excerpt)
+   :language: python
+   :pyobject: sync_pause
+
+.. literalinclude:: ../../examples/debugging/sync_bp.py
+   :caption: examples/debugging/sync_bp.py (called in a subactor,
+       excerpt)
+   :language: python
+   :pyobject: start_n_sync_pause
+
+The full script also exercises the hairier root-actor bg-thread
+cases (and documents their remaining sharp edges) if you want the
+deep lore.
+
+The builtin ``breakpoint()`` override
+*************************************
+
+When debug mode boots with greenback available, ``tractor`` wires
+Python's `PEP 553`_ hook so the *builtin* ``breakpoint()`` becomes
+the actor-aware sync pause, by exporting::
+
+    PYTHONBREAKPOINT=tractor.devx.debug._sync_pause_from_builtin
+
+That means third-party and legacy code containing bare
+``breakpoint()`` calls debugs correctly inside your actor tree
+with zero edits (the override even forwards kwargs like
+``hide_tb`` to the underlying pause machinery, as shown in the
+excerpt above).
+
+.. warning::
+
+   Without greenback (or with ``maybe_enable_greenback=False``,
+   the default), ``debug_mode=True`` instead *blocks* the builtin
+   ``breakpoint()``: ``sys.breakpointhook`` is swapped for a
+   raiser and ``PYTHONBREAKPOINT=0`` is set. A naive
+   ``breakpoint()`` from some random process would clobber the
+   shared tty, so we'd rather hand you a loud ``RuntimeError``
+   with install instructions.
+
+Both the hook and the env var are restored to their prior values
+on runtime exit — see
+``examples/debugging/restore_builtin_breakpoint.py`` for the
+proof.
+
+Breakpoints inside ``asyncio`` tasks
+------------------------------------
+
+Yes, even "infected ``asyncio``" actors get the goods. Spawn a
+child with ``infect_asyncio=True`` (``trio`` runs as a guest on
+the ``asyncio`` loop inside it) and, with debug mode + greenback
+armed, every ``asyncio`` task started via ``tractor.to_asyncio``
+is automatically granted a greenback portal — so a plain builtin
+``breakpoint()`` (or ``tractor.pause_from_sync()``) inside an
+``asyncio.Task`` joins the same single-terminal, tree-locked REPL
+flow:
+
+.. literalinclude:: ../../examples/debugging/asyncio_bp.py
+   :caption: examples/debugging/asyncio_bp.py
+   :language: python
+
+Note the interleave: a ``breakpoint()`` on the ``asyncio`` side,
+``tractor.pause()`` on the ``trio`` side of the same actor, and
+another pause up in the root — all serialized through the one tty
+lock with no cross-actor (or cross-event-loop!) clobbering.
+
+One catch: ``asyncio`` tasks spawned *out-of-band* — i.e. not via
+``tractor.to_asyncio``, typically by some third-party aio lib —
+have no portal bestowed, so a sync pause from one raises a loud
+``RuntimeError`` telling you to ``greenback.ensure_portal()``
+first. See :ref:`the caveats <debugging-caveats>` below.
+
+Teardown debugging: the shielded pause
+--------------------------------------
+
+`Cancellation`_ is ``trio``'s bread and butter, which raises an
+awkward question: how do you REPL inside an *already-cancelled*
+scope, say while debugging some teardown sequence? A bare
+``pause()`` would itself be cancelled at its next checkpoint.
+
+The answer is ``await tractor.pause(shield=True)``, which wraps
+the lock acquisition and REPL session in a shielded cancel scope
+(``post_mortem(shield=True)`` works the same way):
+
+.. literalinclude:: ../../examples/debugging/shielded_pause.py
+   :caption: examples/debugging/shielded_pause.py
+   :language: python
+
+If you forget, ``tractor`` has your back: an unshielded
+``pause()`` from a cancelled scope fails fast with a hint
+suggesting ``await tractor.pause(shield=True)`` instead of
+silently never REPL-ing.
+
+Go ahead, mash ctrl-c
+---------------------
+
+While any REPL is live the runtime installs a custom ``SIGINT``
+handler tree-wide so that a reflexive ``ctrl-c`` (or five) can't
+nuke your debug session:
+
+- the actor that owns the REPL ignores the interrupt and simply
+  re-flushes the prompt — keep mashing, it's fine,
+- the root actor ignores ``SIGINT`` while a still-IPC-connected
+  child holds the tty lock, so the supervisor won't tear down the
+  tree out from under the debugger,
+- if the lock state has gone *stale* — the locking child died or
+  its IPC channel dropped — the root cancels the stale lock scope
+  and restores ``trio``'s default handler, so ``ctrl-c`` works
+  again exactly when it should.
+
+The handler is uninstalled and ``trio``'s own ``SIGINT``
+semantics restored every time a REPL releases (on ``continue`` /
+``quit``).
+
+Live task-tree dumps
+--------------------
+
+Sometimes there's no error to catch — the tree is just *hung* and
+you want to know where. For that ``tractor`` integrates
+`stackscope`_: send a signal, get a full ``trio`` task-tree dump
+from every actor in the tree.
+
+Enable it any of three ways:
+
+- ``open_root_actor(enable_stack_on_sig=True)`` (or via
+  ``open_nursery()`` which forwards it),
+- set ``TRACTOR_ENABLE_STACKSCOPE=1`` in the env — it's inherited
+  through the process tree so every (sub)actor arms the handler
+  at boot,
+- call ``tractor.devx.enable_stack_on_sig()`` directly.
+
+It's intentionally *not* gated on ``debug_mode`` so you can leave
+it armed in plain runs. Then, when the hang strikes, signal the
+tree with ``SIGUSR1``.
+
+.. tip::
+
+   No need to hunt down pids — pattern-match the original cmdline
+   with ``pkill``::
+
+       $ pkill --signal SIGUSR1 -f "python example_script.py"
+
+Each actor dumps its entire ``trio`` task tree (full nursery
+recursion via ``stackscope.extract()``) to its tty *and* tees it
+to ``/tmp/tractor-stackscope-<pid>.log`` — so the trace survives
+even under captured-stdio harnesses — then relays the signal on
+to its children, parent-before-child, until the whole tree has
+reported in.
+
+Try it yourself with the demo script, which deliberately hangs a
+subactor in a shielded sleep:
+
+.. literalinclude:: ../../examples/debugging/shield_hang_in_sub.py
+   :caption: examples/debugging/shield_hang_in_sub.py
+   :language: python
+
+(That ``trio.CancelScope(shield=True)`` hang also shows off the
+zombie reaper: ``ctrl-c`` the root and the un-cancellable child
+still gets hard-reaped — if you can create a zombie it **is a
+bug**.)
+
+Crash handling for sync and CLI code
+------------------------------------
+
+All of the above rides on the actor runtime, but crashes don't
+politely wait for ``trio.run()``. For plain sync code — think
+``typer``/``click`` CLI endpoints, config parsing, anything
+pre-runtime — there's a sync context manager that wraps the same
+``pdbp`` post-mortem UX:
+
+.. code:: python
+
+    from tractor.devx import open_crash_handler
+
+    def main():    # any sync code, no runtime required
+        with open_crash_handler() as boxed:
+            run_my_cli_thing()
+
+By default any ``BaseException`` (minus an ``ignore`` set
+defaulting to ``KeyboardInterrupt`` and ``trio.Cancelled``)
+enters the REPL then re-raises on exit; pass
+``raise_on_exit=False`` to suppress instead and introspect the
+``boxed.value`` afterward. The ``catch``/``ignore`` sets and a
+``repl_fixture`` are all tweakable.
+
+For the classic ``--pdb`` CLI-flag pattern use the conditional
+variant:
+
+.. code:: python
+
+    from tractor.devx import maybe_open_crash_handler
+
+    @app.command()    # a `typer` (or `click`) endpoint
+    def cmd(pdb: bool = False):
+        with maybe_open_crash_handler(pdb=pdb):
+            ...
+
+REPL niceties and hooks
+-----------------------
+
+Every REPL in this guide is a `pdbp`_ instance (the maintained
+fork-and-fix of `pdb++`_) pre-configured by ``tractor``:
+
+- pygments syntax highlighting in listings and tracebacks,
+- tab completion — including an automatic fixup for
+  libedit-compiled CPythons (e.g. ``uv``-distributed pythons),
+- sticky mode available via the ``sticky`` command (off by
+  default),
+- no long-line truncation (terminal resizes behave),
+- the ``(Pdb+)`` prompt, ``ll``, hidden-frames support and the
+  rest of the ``pdb++`` goodies you may already know.
+
+Internal runtime frames are traceback-hidden so the REPL lands
+exactly on *your* ``pause()``-call or crash frame, never on
+``tractor`` guts.
+
+Finally, if your app owns the terminal (TUIs, fullscreen
+dashboards) pass ``repl_fixture=<your ctx mngr>`` to ``pause()``,
+``post_mortem()`` or ``open_crash_handler()``: it's entered just
+before the REPL engages (return ``False`` to skip entry entirely)
+and exited on release — perfect for suspending and restoring your
+screen around a debug session.
+
+.. _debugging-caveats:
+
+Caveats and platform notes
+--------------------------
+
+An honest list of the current rough edges:
+
+- **Windows**: the debugger has no CI coverage on windows at all
+  (the entire test module is skipped there); manual testing has
+  shown it *can* work, but you're in uncharted territory —
+  reports welcome!
+- **macOS**: supported but with rough edges: special-cased prompt
+  re-flushing for ``bash``-on-darwin, a few tooling tests skipped
+  on CI, and the AF_UNIX ~104-char socket-path limit forces some
+  examples (like the stackscope demo above) to fall back from
+  ``'uds'`` to ``'tcp'`` transport. Wonder if all of it'll work
+  on OS X? So do we.
+- **CPython 3.14**: ``greenback`` (via ``greenlet``) doesn't
+  support 3.14 yet, so ``pause_from_sync()`` and the builtin
+  ``breakpoint()`` override are effectively 3.13-only for now.
+  The async APIs — ``pause()`` and ``post_mortem()`` — need no
+  greenback and work everywhere.
+- **out-of-band** ``asyncio`` **tasks**: sync pauses from aio
+  tasks *not* spawned via ``tractor.to_asyncio`` raise a
+  ``RuntimeError`` (no greenback portal was bestowed); run
+  ``await greenback.ensure_portal()`` inside such a task first.
+- **nested-tree ctrl-c edges**: ``SIGINT`` relay through
+  intermediary parents that aren't themselves in debug mode still
+  has known rough edges — see `#320`_.
+- **captured stdio**: ``pytest``-style output capture can hang a
+  ``pause()``; use a real terminal (or a pty à la ``pexpect``,
+  which is how ``tractor``'s own suite drives every one of these
+  examples).
+
+Where to next?
+--------------
+
+.. seealso::
+
+   - :doc:`/guide/context` — the SC-linked cross-actor task API
+     that all the crash-propagation semantics above ride on.
+   - :func:`tractor.pause`, :func:`tractor.post_mortem` and
+     :func:`tractor.pause_from_sync` in the API reference.
+   - ``examples/debugging/`` — 20-odd runnable scripts, nearly
+     every one exercised by the test suite through a real pty.
+
+.. _structured concurrency:
+   https://en.wikipedia.org/wiki/Structured_concurrency
+.. _trio: https://github.com/python-trio/trio
+.. _cancellation: https://trio.readthedocs.io/en/latest/
+   reference-core.html#cancellation-and-timeouts
+.. _pdbp: https://github.com/mdmintz/pdbp
+.. _pdb++: https://github.com/pdbpp/pdbpp
+.. _greenback: https://github.com/oremanj/greenback
+.. _stackscope: https://github.com/oremanj/stackscope
+.. _PEP 553: https://peps.python.org/pep-0553/
+.. _#320: https://github.com/goodboy/tractor/issues/320

docs/guide/discovery.rst

@@ -0,0 +1,255 @@
+Actor discovery
+===============
+
+So you've spawned a tree of trio-"actors"; now their tasks need to
+*find* each other to start a dialog. ``tractor`` ships a (self
+admittedly) **very naive** discovery system which is nonetheless
+mighty handy for wiring up service-style apps: a built-in
+*registrar* actor plus a small set of lookup APIs that deliver
+a live, connected ``Portal`` to whichever peer you're after.
+
+.. d2:: diagrams/actor_tree.d2
+   :margin:
+   :caption: The root actor doubles as the *registrar* by
+       default; every spawned actor registers itself with it.
+   :alt: actor tree with root acting as registrar
+
+Because ``tractor`` is built on structured concurrency (SC), the
+discovery layer is *not* some external etcd/consul-shaped service
+you have to babysit; it's just another actor — normally the root
+of your tree — doing a bit of bookkeeping as part of the runtime.
+
+Every actor phones home
+-----------------------
+
+On runtime boot **every** actor self-registers with the registrar:
+it submits its unique ``(name, uuid)`` identity pair (aka its
+``uid``) mapped to the list of transport addresses its IPC server
+is bound to. On graceful teardown it likewise *un*-registers, so
+the registry tracks the live tree as it grows and shrinks.
+
+.. note::
+   Actor names are **not** enforced unique — the registry is keyed
+   by the full ``(name, uuid)`` pair. Name-based lookups simply
+   resolve to the *last* registered match, so if you boot five
+   actors all named ``'bob'``, you get the freshest ``'bob'`` B)
+
+First boot: who's the registrar?
+--------------------------------
+
+By default the **root actor** *is* the registrar; subactors
+inherit the tree's ``registry_addrs`` at spawn time so the whole
+clan shares one registry with zero config on your part.
+
+The bootstrap rule inside ``open_root_actor()`` is delightfully
+simple:
+
+- on boot, ping every socket addr in ``registry_addrs``; when none
+  are passed the per-transport defaults are used: for TCP the
+  loopback ``('127.0.0.1', 1616)``, for UDS a
+  ``registry@1616.sock`` file,
+
+- if a registrar answers, you boot as a plain (non-registrar) root
+  actor and register with the *existing* registry; your own IPC
+  server binds random same-transport addrs instead,
+
+- if **nothing answers, congratulations: you just became the
+  registrar**. Your transport server binds the registry addrs
+  themselves and you start serving lookups for everyone else.
+
+Pass ``ensure_registry=True`` when your program *requires* being
+the one-and-only registrar; boot then fails loudly with a
+``RuntimeError`` if some other process already bound the registry
+socket(s).
+
+Looking up actors
+-----------------
+
+All lookup APIs are async context managers, so the SC rule you
+already know from the rest of ``tractor`` holds here too: any
+delivered portal (and its underlying IPC channel) is scoped to
+your ``async with`` block — no dangling connections.
+
+``find_actor()``
+****************
+
+The workhorse: ask the registrar for ``name`` and connect a portal
+to the match, or get ``None`` back when nobody's home:
+
+.. code:: python
+
+    async with tractor.find_actor('data_feed') as portal:
+        if portal is None:
+            ...  # not registered anywhere; maybe spawn it?
+        else:
+            await portal.run(do_stuff)
+
+Knobs worth knowing:
+
+- ``registry_addrs=[...]``: query specific (possibly multiple,
+  possibly remote) registrars instead of your tree's default,
+
+- ``only_first=False``: deliver a ``list[Portal]`` of *all*
+  matches found across the queried registrars instead of just the
+  first,
+
+- ``raise_on_none=True``: raise a ``RuntimeError`` instead of
+  yielding ``None`` when no match is found — for when absence is
+  a hard error in your app.
+
+``wait_for_actor()``
+********************
+
+Blocks until *someone* registers under ``name``, then yields a
+portal to that registree. Perfect for "wait for my sibling service
+to come up" sequencing:
+
+.. code:: python
+
+    async with tractor.wait_for_actor('service') as portal:
+        await portal.run(some_fn)
+
+``query_actor()``
+*****************
+
+A lookup *without* connecting to the target: yields an
+``(addr, reg_portal)`` pair where ``addr`` is the peer's preferred
+transport address, or ``None`` when nothing is registered under
+that name. Use it for liveness peeks or to log where a service
+lives without actually dialing it up.
+
+``get_registry()``
+******************
+
+Yields a portal straight to the registrar actor itself — or a
+``LocalPortal`` shim when the calling actor *is* the registrar
+(no IPC required to talk to yourself, hopefully).
+
+Fast paths and address preference
+---------------------------------
+
+Before doing any RPC to the registrar, every lookup first scans
+the calling actor's *already-connected peers*: if you have a live
+channel to an actor named ``name`` you get a portal over it
+immediately, no registrar round-trip at all.
+
+When a registry entry holds *multiple* addresses (a multihomed
+actor) the "best" one is chosen by locality:
+
+1. UDS — same-host guaranteed, lowest overhead,
+
+2. local TCP — loopback or any of this host's own interface
+   addrs,
+
+3. remote TCP — the only option when actually distributed.
+
+Within a tier the most recently registered addr wins. Stale
+entries (an addr that no longer accepts connections) are detected
+on use and deleted from the registrar's table on your behalf.
+
+Demo: register and find a service
+---------------------------------
+
+The simplest possible spin: start a subactor, ask the registrar
+where it lives, and wait on its registration:
+
+.. literalinclude:: ../../examples/service_discovery.py
+   :caption: examples/service_discovery.py
+   :language: python
+
+The daemon-service pattern
+--------------------------
+
+The classic deployment shape: a long-lived daemon actor serves
+RPC, later-running code discovers it by name, calls in, and
+gracefully cancels it when the job is done:
+
+.. literalinclude:: ../../examples/service_daemon_discovery.py
+   :caption: examples/service_daemon_discovery.py
+   :language: python
+
+Note the teardown ordering — *graceful cancel* of the daemon via
+its portal is part of the pattern; under SC a "service" is still
+somebody's child and somebody is responsible for reaping it.
+
+Joining an existing tree from outside
+-------------------------------------
+
+Discovery isn't limited to a single program: any standalone script
+can join a running tree by booting its *own* root actor pointed at
+the existing registrar:
+
+.. code:: python
+
+    import trio
+    import tractor
+
+    async def main():
+        async with (
+            # contact the live tree's registrar
+            tractor.open_root_actor(
+                registry_addrs=[('127.0.0.1', 1616)],
+            ),
+            tractor.find_actor('data_feed') as portal,
+        ):
+            ...  # RPC away like you were born here
+
+    trio.run(main)
+
+Per the bootstrap rules above, if the registrar at those addrs is
+*not* reachable this process simply becomes its own (registrar)
+root — so the same code works standalone and as a tree-joiner.
+
+"Arbiter"? A legacy naming note
+-------------------------------
+
+In older releases (and many an old blog post or issue thread) the
+registrar actor was called the *arbiter*, with matching APIs like
+``get_arbiter()`` and an ``arbiter_addr`` argument. All of that
+terminology is retired: it's *registrar*/*registry* everywhere now
+(``registry_addrs``, ``get_registry()``, ...) and the
+``tractor.Arbiter`` export survives only as a back-compat alias of
+``tractor.Registrar``. If you see "arbiter" somewhere, mentally
+substitute "registrar" and you're up to date.
+
+.. note::
+   Multihoming nerds: ``tractor.discovery`` also ships
+   libp2p-style *multiaddr* helpers — ``mk_maddr()`` and
+   ``parse_maddr()`` — for describing transport endpoints as
+   structured strings.
+
+Very naive, very honest
+-----------------------
+
+To be clear, this is a **very naive** discovery system: one
+process-tree-local registrar holding a dict, no replication, no
+re-election when it dies, no cross-host propagation. That's
+intentional (for now); it covers the "wire up my services on this
+host" case without dragging in a consensus protocol.
+
+On the roadmap (issue `#216`_ tracks a chunk of it):
+
+- registrar high(er)-availability: staying up past tree teardown
+  and re-election,
+
+- a `gossip protocol`_ for decentralized cross-host discovery (the
+  zguide's `discovery`_ chapter is the spiritual reference),
+
+- `modern protocol`_ (rendezvous) style meet-up points.
+
+If any of that scratches your itch, the issue tracker would love
+to hear from you.
+
+.. seealso::
+   - :doc:`/guide/testing` — watching live actor trees (and their
+     registrar) while the test suite or your app runs.
+   - API refs: :func:`tractor.find_actor`,
+     :func:`tractor.wait_for_actor`,
+     :func:`tractor.query_actor`,
+     :func:`tractor.get_registry`,
+     :class:`tractor.Registrar`.
+
+.. _gossip protocol: https://en.wikipedia.org/wiki/Gossip_protocol
+.. _modern protocol: https://en.wikipedia.org/wiki/Rendezvous_protocol
+.. _discovery: https://zguide.zeromq.org/docs/chapter8/#Discovery
+.. _#216: https://github.com/goodboy/tractor/issues/216

docs/guide/index.rst

@@ -0,0 +1,52 @@
+Guides
+======
+Task-focused walkthroughs of every major ``tractor``
+subsystem, each built around real, *test-suite
+verified* example scripts from the repo's
+``examples/`` dir (we never copy-paste code into
+docs; what you read is what CI runs).
+
+Roughly in "first date to long term relationship"
+order,
+
+- :doc:`spawning` — actor nurseries, daemons +
+  one-shot workers, process lifetimes.
+- :doc:`rpc` — portals: calling into another
+  process like it's a local ``await``.
+- :doc:`context` — the cross-actor task-pair
+  primitive at the heart of modern ``tractor``.
+- :doc:`streaming` — one-way and bidirectional
+  msg streams between actors.
+- :doc:`cancellation` — supervision, error
+  boxing + propagation, teardown discipline.
+- :doc:`debugging` — the multi-process native
+  REPL debugger; our flagship DX feature B)
+- :doc:`discovery` — the registrar, finding
+  actors by name, service patterns.
+- :doc:`clustering` — quick flat process
+  clusters via one ``async with``.
+- :doc:`parallelism` — worker pools without
+  pools; a ``concurrent.futures`` re-think.
+- :doc:`asyncio` — "infected asyncio" mode:
+  SC-supervise ``asyncio`` tasks from ``trio``.
+- :doc:`msging` — typed IPC payloads, the wire
+  msg-spec and custom codecs.
+- :doc:`testing` — running + monitoring the
+  test suite (and testing your own actor apps).
+
+.. toctree::
+   :hidden:
+   :maxdepth: 1
+
+   spawning
+   rpc
+   context
+   streaming
+   cancellation
+   debugging
+   discovery
+   clustering
+   parallelism
+   asyncio
+   msging
+   testing