---
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)
```