# Mutation Test > Run mutation testing to evaluate test suite quality. Use when user says "mutation test", "test quality", "are my tests strong enough", or "find weak tests". Introduces code mutations and reports mutation score with suggestions for improvement. Use when this capability is needed. - Skill: `tomevault-io/mutation-test` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/mutation-test` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/mutation-test/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/mutation-test --- Run mutation testing to evaluate test suite quality. ## Context Test suite status: !`npm test -- --passWithNoTests 2>&1 | tail -5 || pytest --co -q 2>&1 | tail -5 || go test ./... 2>&1 | tail -5 || echo "Could not detect test runner"` ## Target: $ARGUMENTS ## Instructions 1. Verify baseline test suite passes 2. Configure mutation testing tool for the project language 3. Run mutation testing on target directory 4. Analyze survived mutants 5. Report mutation score and identify weak test areas 6. Suggest additional tests to kill survived mutants --- > Source: [gr1m0h/dot](https://github.com/gr1m0h/dot) — distributed by [TomeVault](https://tomevault.io).