---
model: openai/gpt-5.6-sol
service: opencode
session: unavailable
timestamp: 2026-08-13T18:19:01Z
git_ref: a2e0df4b
scope: code
substantive: true
raw_file: 20260813T181901Z_a2e0df4b_prompt_io.raw.md
---

## Prompt

Continue Tractor PR 490 after the paired piker EMS consumer commit. Clean
cancelled-task diagnostics, define or reject zero-buffer broadcast behavior,
review and verify the change, then stop at a complete commit plan.

## Response summary

Bound cancellation diagnostics to receiver progress, terminal state and
resource lifetime; made EOC durable across peers; released wrapper-owned root
broadcasters without breaking graceful EOC or subclass overrides; and rejected
non-positive fan-out retention capacity.

## Files changed

- `tractor/trionics/_broadcast.py` - diagnostic lifecycle, durable EOC and
  buffer validation.
- `tractor/_streaming.py` - safe `MsgStream` root broadcaster cleanup.
- `tractor/to_asyncio.py` - linked-channel root broadcaster cleanup.
- `tests/test_task_broadcasting.py` - cancellation, EOC, wrapper and capacity
  regressions.

## Human edits

None - generated output follows the requested fifth iterative item.
