---
model: openai/gpt-5.6-sol
service: opencode
session: ses_0799212ebffe42arY96czXn89F
timestamp: 2026-08-12T21:31:17Z
git_ref: 51185487
scope: code
substantive: true
raw_file: 20260812T213117Z_51185487_prompt_io.raw.md
---

## Prompt

For Tractor PR 490 item four, expose `raise_on_lag` through the public IPC and
asyncio linked-channel subscription wrappers. Review, verify and return a
complete commit plan before applying the API downstream in piker.

## Response summary

Added public per-subscription lag policy to both wrappers, preserved first-call
root policy, documented the semantics, and covered forwarding plus real fan-out
paths.

## Files changed

- `tractor/_streaming.py` - `MsgStream` lag policy forwarding.
- `tractor/to_asyncio.py` - linked-channel lag policy forwarding.
- `docs/guide/streaming.rst` - IPC fan-out policy docs.
- `docs/guide/asyncio.rst` - linked-channel fan-out policy docs.
- `tests/test_task_broadcasting.py` - wrapper policy regression.

## Human edits

None - generated output follows the requested fourth iterative item.