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Mutation testing with Muter (experimental) v1.0.0

Use this resource to check that tests would notice a wrong logic change

New

  • 315 downloads
  • 135 likes
  • 184 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install mutation-testing-muter

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

This skill is experimental: it runs Muter, which mutates the source and reruns the tests, then lists the surviving mutants, meaning covered code that is not really asserted. The report stays advisory and is never a merge gate, and it targets logic engines.

Mostly picked by

Updated November 2, 2026

Card for the “Mutation testing with Muter (experimental)” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: setup, report reading and caveats
  • templates/muter.conf.yml: Muter configuration

Good fit for

  • Coverage is good but bugs still slip through
  • You want to check the logic of a calculation engine

Not for

    Tags

    • mutation testing
    • muter
    • coverage
    • swift

    About

    You say

    “Run mutation testing on the score engine and list the surviving mutants.”

    Card for the “Mutation testing with Muter (experimental)” skill

    Skill published by rshankras under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to check that tests would notice a wrong logic change
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md4.4 KB
    • templates/muter.conf.yml0.7 KB

    Origin and licence

    Listed unmodified

    Author
    rshankras
    Source
    github.com/rshankras/claude-code-apple-skills/tree/9ffb83138209057875698dd11c1720c657c47a92/skills/testing/mutation-testing
    Licence
    MIT

    Notice

    « mutation-testing » (rshankras, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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