mutation-testing
mutation-testing is a Test suite operations & coverage skill for AI agents, published by pvillega in the claude-templates repository on GitHub. Skillspace rates mutation-testing D (60/100) and it passed the safety scan; the rating is based on static analysis only.
Diff-scoped mutation testing to verify test quality beyond coverage metrics. Detects language, selects the appropriate tool (Stryker, mutmut, cargo-mutants, PIT, gremlins), and runs mutations only on changed code. Use when asked to run mutation testing, check test quality, find weak tests, verify test coverage is meaningful, or "are my tests actually catching bugs?". Also use after TDD cycle completes or when bugmagnet identifies test coverage gaps. Triggers on: mutation testing, mutant, test quality, weak tests, test effectiveness, "do my tests catch bugs", "are these tests good enough", "verify test quality", "mutation score".
- Grade
- D
- Quality
- 60 / 100
- Safety
- Passed
- GitHub stars
- 23
Unproven: rated by static analysis only, not yet compared head-to-head.
This rating describes the version of the repository we crawled; it may have changed since, so go by its current files.
Our review
- Architecture
- 82 / 100
- Maturity
- Structured: ships references or scripts
- Security scan
- Low-risk patterns
- License
- Not declared. Check the repository before reusing it.
- Adoption
- Adopted by 0 other repositories, in 0 collections
What the scanner flagged
- mentions secrets in text
Not checked yet
- Category is a classifier prediction; no model has read this skill yet
- Not judged on the rubric yet (not a contender in its category)
- No blind task eval yet
- Scope (portable / vendor / repo-internal) not assessed; only the top of each category is read for scope
- Sibling files (scripts, references) not fetched; security scan covers SKILL.md only
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