tractor/ai/prompt-io/claude/20260702T172233Z_5cd190c5_prompt_io.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).