Compare current quality metrics against a stored baseline to detect regressions in tests, coverage, type errors, linting, and dead code. Enforces quality standards by blocking task completion when metrics degrade beyond tolerance thresholds.
| Metric | Rule | Tolerance | Regression If |
| Tests passed | Must be >= baseline | None | current < baseline | | Coverage | Must be >= baseline - 1% | 1% | current < baseline - 1% | | Type errors | Must be baseline | | Linting | Must be baseline | | Dead code | Must be baseline + 2% |
Compares current quality metrics (tests, coverage, type errors, linting, dead code) to baseline and detects regressions. PROACTIVELY invoked after task completion, before marking task complete, or before merging/committing. Blocks on regressions to prevent quality degradation. Use when completing tasks, validating changes, or checking for quality regressions against baselines. Source: dawiddutoit/custom-claude.