# Mutation Test

> Mutation testing with two engines. Uses the project's NATIVE mutation runner (StrykerJS / Infection / mutmut / PIT / cargo-mutants) when one is configured — installing it on explicit consent when it is not — for a reproducible, comparable score; and an LLM-guided engine for the mutation classes native mutators cannot express: error-path removal, state mutation, async hazards, and security guard removal. Generates mutations, executes them against the relevant tests, and FIXES the tests whose gaps let a mutation survive — surviving mutants are closed in-run, not handed to another skill. Emits the cross-tool stryker-mutator.io/report.schema.json report alongside its own artifact. Flags: [path] (scope), full, --max N, --category, --runner auto|native|llm|hybrid, --break N, --no-install, --dry-run, --quick, --report-only.

## Facts
- Page: https://tashan.sh/capability/skill-greglas75-mutation-test
- tashan id: skill:greglas75/mutation-test
- Source: https://github.com/greglas75/zuvo
- Type: skill
- Category: other
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 98.0
- Freshness: 95.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r mutation-test ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-09-12 by tashan (https://tashan.sh) from public evidence. Scorer s5.