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Mutation testing with Stryker and mutmut v1.0.0

Use this resource to check that tests catch real bugs by mutating the code

New

  • 579 downloads
  • 114 likes
  • 154 saves

Free

Install with the CLI

In a terminal, from the folder you want:

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

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

The agent sets up Stryker or mutmut, runs mutations on the chosen files and reads the surviving mutants. You get a list of weak tests and a mutation score to improve.

Mostly picked by

Updated November 2, 2026

Card for the “Mutation testing with Stryker and mutmut” skill

Details

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

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What you get

  • SKILL.md : Stryker setup with Vitest or bun test
  • SKILL.md : incremental runs, targeted files and HTML report

Good fit for

  • Your coverage is good but bugs still get through the tests
  • You want to measure test quality on a critical module

Not for

    Tags

    • mutation testing
    • stryker
    • test quality
    • python

    About

    You say

    “Run mutation testing on the discount module and list the surviving mutants.”

    Card for the “Mutation testing with Stryker and mutmut” skill

    Skill published by secondsky 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 catch real bugs by mutating the code
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md5.8 KB

    Origin and licence

    Listed unmodified

    Author
    secondsky
    Source
    github.com/secondsky/claude-skills/tree/88378361314f558fb719aec0af9fd898ab36f0b2/plugins/mutation-testing/skills/mutation-testing
    Licence
    MIT

    Notice

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

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