Check work

This skill verifies completed work. It does not replace implementation planning or domain-specific validation.

Procedure

1. Re-read the task's stated completion criteria.
2. Inspect the complete diff and list every modified, added, removed, or generated file.
3. Look for scope creep, accidental rewrites, placeholder content, stale copies, and missing artifacts.
4. Run the project-defined build, compiler, test, linter, and package validators.
5. Verify the built artifact rather than assuming source success implies release success.
6. Compare public interfaces, paths, record IDs, configuration names, and archive layout against the prior version.
7. Check negative cases: missing dependency, malformed input, empty result, duplicate entry, unsupported runtime, and interrupted execution where relevant.
8. Write results to VALIDATION.md with exact commands and exit codes.

Independent review

Use one read-only reviewer when it adds value with only the task, diff, and validation evidence. Do not ask several agents to edit the same files. The implementation owner decides and applies fixes.