git

The agent fixed it in another worktree and tested the wrong checkout

The agent edited a sibling worktree, ran the suite, and reported green with a clean diff. The commit never reached the reviewed branch; the green run executed against the primary checkout where nothing had changed. Passing tests prove the directory they ran in, not where the edit lives.

Oct 22, 2026 3 min read

Two Parallel Agents Edited the Same File; the Merge Dropped One Quietly

Two tickets, two worktrees, both green. The merge kept the second agent's hunk in the shared registry and dropped the first agent's flag; no test failed, because neither suite asserted the shared file's full contents.

Oct 21, 2026 3 min read