A work agent ended its turn to wait for a four-minute test suite it had backgrounded, and the run ended with it: 314 lines of passing work staged and never committed, an empty branch, a halted phase. Nothing in the prompts said the run was a single non-interactive turn, so waiting looked like a sensible strategy.
All four core prompts now open with the same block: this is one turn, the process exits with your reply, and nothing you meant to finish afterwards survives. It names the trap directly — do not background a command and end the turn to wait for it, do not promise to come back — and each template follows it with what its own run loses: work.md commits around long-running commands, act-pr.md commits and pushes, review-pr.md posts its verdict inside the turn, review.md writes its report there.
The block sits before the task body and carries no braces, so str.format still renders it and the NOT READY / ADDRESSED / PR REVIEW / RELEVANCE REVIEW marker lines keep their place after it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
