---
model: openai/gpt-5.6-sol
service: opencode
session: ses_0799212ebffe42arY96czXn89F
timestamp: 2026-08-11T23:38:33Z
git_ref: 7cbd64ee
scope: code
substantive: true
raw_file: 20260811T233833Z_7cbd64ee_prompt_io.raw.md
---

## Prompt

Open a new isolated worktree in the local Tractor repository and draft a fix
for `BroadcastReceiver` reporting that a lagged one-slot consumer dropped
zero values when one value had actually been displaced.

## Response summary

Corrected the off-by-one lag count while preserving cursor recovery and added
deterministic narrow- and wider-window regressions for exact loss reporting.

## Files changed

- `tractor/trionics/_broadcast.py` - exact broadcast overrun count.
- `tests/test_task_broadcasting.py` - lag count and recovery regression.

## Human edits

None - generated output follows the user's diagnosed edge case.