Field Guide 30: a 28-item checklist for making coding agents prove their work, from the definition of done through typecheck, lint, test and build to what tests cannot see and a final report built on evidence. The kit has a zero-dependency verify runner that writes .verify/report.md, a Stop hook that blocks the end of a turn until a passing report is newer than every change, a PostToolUse hook that checks each edited file, a suppression check, settings.json examples and a hook-config validator that catches configs the JSON schema accepts but Claude Code silently ignores.
When agents report work as done that does not build or pass its tests, before you let a session run unattended, or when you review agent pull requests and want evidence instead of claims.