verification-before-completion

Evidence before completion claims: identify the command that would prove the claim, run it fresh in this session, read the full output including exit code, and only then state the result — with the evidence. Use when about to report work as done, fixed, passing, or ready; before committing, opening a PR, or moving to the next task; when relaying a subagent's result (verify the diff, not the report); and when adding a regression test (red-green it: revert the fix, watch it fail, restore, watch it pass). Claims match their evidence — 'tests pass' means this session's run with zero failures, not a previous run or an expectation; if verification fails, the deliverable is the actual state with output. Prefer wiring recurring checks into pre-commit or CI over re-remembering them. Not for designing what to verify (a test-strategy concern) — this skill governs the moment of claiming, not the shape of the suite.