---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-28T20:08:22Z
git_ref: wkt/big_boi_docs_472_follow_ups
diff_cmd: git diff 0be872ff..HEAD
---

## Prompt

Prime PR #512 for landing. Apply the Python style policy throughout
the changed examples, improve typing, use review agents to find and
fix correctness issues, run the proper review process, push the agent's
own code, and then audit documentation changes since PR #460 for stale,
missing, defunct, or improvable coverage.

## Response

> `git diff 0be872ff..HEAD -- examples/`

Restyled and typed all 38 changed example modules while preserving
intentional debugger failures and hanging reproducers. Added required
multiline docstrings, corrected async callable annotations, modernized
legacy API terminology, and preserved complete debugger process trees.

Rebuilt `examples/discovery/dedicated_registrar.py` as a real
external-discovery example. A standalone registrar process now selects
and retries bounded ephemeral addresses, publishes readiness atomically,
rejects accidental registrar reuse, serves sibling service and client
actors, proves lookup used the registrar instead of a local-peer channel,
and performs bounded, validated, cross-platform shutdown.

Staged review moved the demo into the discovery example group, converted
collision classification to structural pattern matching, documented the
selector-socket close/rebind race, and extracted process ownership into an
async context manager. A source TODO records the future public discovery
subsystem, Piker service-management lessons, and pytest registry-isolation
use case.

> `git diff 0be872ff..HEAD -- docs/guide/discovery.rst`

Corrected registrar, duplicate-name, and multi-registrar discovery
guidance, including configured-order and `None` placeholder behavior.

> `git diff 0be872ff..HEAD -- docs/guide/msging.rst`

Corrected typed-payload validation boundaries and separated working
task-scoped codec encoding from private per-dialog decoding and the
incomplete decorator hook parameters.

## Review and validation

Multiple independent reviews found and drove fixes for registrar
discovery validity, port-selection races, teardown, process diagnostics,
shutdown status, inaccurate discovery ordering, async callable typing,
missing docstrings, truncated debugger command diagrams, stale APIs, and
payload-error relay wording.

Validation completed:

- AST parsing, Ruff, 69-column checks, and required-docstring audit for
  all 38 changed Python files.
- Sphinx HTML build succeeded.
- Documentation example harness: 24 passed.
- Trio coverage: 7 passed, 4 xfailed, 1 xpassed.
- Dedicated registrar direct run and focused harness test passed with a
  clean child exit and no traceback.
- Debugger suite: 20 passed, 6 skipped, and 8 reproducible
  `ctl-c=True` pexpect timeouts. One exact failure reproduced on
  untouched `main`, confirming a baseline failure; its root cause
  remains unclassified. No leaked actor processes remained.

The post-PR-#460 audit identified follow-up work around advertised but
inert runtime selectors, platform/backend support, unresolved discovery
contracts, cached-context teardown, codec recipes, examples-as-tests
coverage, public API exports, broadcast factory contracts, stale examples,
README duplication, release notes, and process-title terminology.

## Follow-up prompt

Capture the previously proposed `ParamSpec`-based `Start` argument
validation work in a focused GitHub issue, then link it from the current
typed-messaging docs patch as planned sender-side checking.

## Follow-up response

Created https://github.com/goodboy/tractor/issues/514 to track deriving
typed `Start` contracts from endpoint signatures, preserving caller-facing
signatures, and validating arguments before sending where possible. Added
the issue link beside the guide's current `Start` validation boundary.
