---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-18T19:30:03Z
git_ref: bf06b4f8
diff_cmd: git diff HEAD~1..HEAD
---

Cancellation while `Actor.start_remote_task()` waits for `StartAck`
can strand its caller-side context and leave the remote task running.
Make one bounded cleanup request, remove local startup state and close
its receive channel.

> `git diff HEAD~1..HEAD -- tractor/runtime/_runtime.py tractor/runtime/_portal.py tractor/_context.py tests/test_context_stream_semantics.py`

Separate private startup-cancellation policy from public target kwargs
using `Portal._run_from_ns()`. Have `Context.cancel()` disable recursive
startup cancellation for its own `_cancel_task` RPC. Exercise
cancellation after `Start` publication and prove the caller-owned actor
remains reusable without leaked contexts.
