---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-12T01:23:24Z
git_ref: 06c4af17
diff_cmd: git diff HEAD~1..HEAD
---

After opening draft Tractor PR 490, the user requested an iterative pass over
additional broadcast subsystem findings. The first item was to correct
`BroadcastState.statistics()` queued counts and its deprecated Trio event
truthiness check, then stop for a complete commit plan.

> `git diff HEAD~1..HEAD -- tractor/trionics/_broadcast.py`

Changed `queued_len_by_task` from raw deque cursor indexes to retained,
receivable counts. Caught-up `-1` reports zero, valid indexes report index plus
one, and lagged cursors clamp to the current retained queue length. Replaced
`trio.Event` truthiness with an explicit `is not None` branch.

> `git diff HEAD~1..HEAD -- tests/test_task_broadcasting.py`

Added a deterministic statistics regression using actual sends and receives.
It verifies caught-up and one-queued states, drives a root receiver beyond a
three-slot retention window to prove clamping, and installs a real
`trio.Event` while treating deprecations as errors.

Verification output:

```text
...........                                                              [100%]
11 passed in 5.76s
```

Python compilation and `git diff --check` passed. Initial adversarial review
caught unclamped lagged cursors and an ineffective event test; both were
fixed. Final review found no actionable issues.
