mutation-test SKILL.md skillA
mutation-test from greglas75/zuvo is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add greglas75/zuvo/mutation-test@git:20261011.13dcd33Pins git:20261011.13dcd33 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- greglas75/zuvo
- Path
skills/mutation-test/SKILL.md- Versions recorded
- 14
- Latest version
- git:20261011.13dcd33, committed Oct 11, 2026
- First version recorded
- Sep 4, 2026
- Size
- 100,624 bytes
- Repository stars
- 7
- License
- MIT
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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# zuvo:mutation-test -- LLM-Guided Mutation Testing Intelligent mutation testing that targets meaningful behavioral gaps rather than random code changes. For each production file, the LLM generates mutations in 7 categories (boundary, logic, null, error, state, async, security), runs only the tests that cover that file, and closes the gaps it finds: every survivor is triaged as a real gap or an equivalent mutant, and each real gap gets the missing assertion added and re-probed in the same run. **Scope:** Production files that have associated test files. Measures how well existing tests detect real behavioral changes. **When to use:** After writing tests, before releases, when mutation score is unknown, when test suite feels shallow despite high line coverage. **Out of scope:** Writing a test suite from scratch (use `zuvo:write-tests`), fixing systematic test anti-patterns across many files (use `zuvo:fix-tests`), auditing test quality without execution (use `zuvo:test-audit`), code quality review (use `zuvo:review`). Adding the single missing assertion that a surviving mutant exposes is IN scope — that is the point of finding it. ## Argument Parsing …
Read the whole file at its exact version.
How to install
mdr add greglas75/zuvo/mutation-test@sha256:de8676b53574a266The line at the top of this page pins the label git:20261011.13dcd33, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ibhli2fbucfpfwv7)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 14 versions of this file, between Sep 4, 2026 and Oct 11, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261011.13dcd33 latest | 2026-10-11 | 13dcd33 | 100,624 B | A | view · diff |
| git:20261011.934f9a5 | 2026-10-11 | 934f9a5 | 99,834 B | A | view · diff |
| git:20261011.33e868b | 2026-10-11 | 33e868b | 99,722 B | A | view · diff |
| git:20261010.e480103 | 2026-10-10 | e480103 | 99,452 B | A | view · diff |
| git:20261010.5e50fc0 | 2026-10-10 | 5e50fc0 | 99,070 B | A | view · diff |
| git:20261002.a7224dc | 2026-10-02 | a7224dc | 91,263 B | A | view · diff |
| git:20261002.99035e0 | 2026-10-02 | 99035e0 | 90,525 B | A | view · diff |
| git:20260922.a6e0e7c | 2026-09-22 | a6e0e7c | 86,885 B | A | view · diff |
| git:20260920.6bf3539 | 2026-09-20 | 6bf3539 | 85,536 B | A | view · diff |
| git:20260908.6f03233 | 2026-09-08 | 6f03233 | 85,228 B | A | view · diff |
| git:20260908.da7ed43 | 2026-09-08 | da7ed43 | 84,058 B | A | view · diff |
| git:20260908.966a816 | 2026-09-08 | 966a816 | 83,278 B | A | view · diff |
| git:20260906.015072f | 2026-09-06 | 015072f | 80,818 B | A | view · diff |
| git:20260904.23ab8ac | 2026-09-04 | 23ab8ac | 80,803 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (100624 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
greglas75/zuvo · 7 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ibhli2fbucfpfwv7 GET https://markdownregistry.com/api/v1/resolve?ref=greglas75/zuvo/mutation-test GET https://markdownregistry.com/api/v1/blob/de8676b53574a266f6982827977b43e805cf9f73e5038eaa651699ccf6d39f0b
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.