Mutation Testing
CheckedAutomatically generates and analyzes code mutations to assess laurigates software's robustness and identify potential vulnerabilities.
Install on your platform
Showing Claude Code. One command installs this skill into any of the agents below.
- 1
Run this in your project
terminal$ npx skills add laurigates/claude-plugins --skill mutation-testing -a claude-code Uses the open-source
skillsCLI and needs Node.js. Add-gto install it for your user instead of this project.
What we know about this skill
Publisher
laurigates
Taken from the source listing. We haven't verified who controls this account.
Install target
Live repository
Not pinned. Installing fetches whatever the repository holds at the time you run the command.
Automated safety checks
This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.
Declares what it does: passed
SKILL.md parses and declares a name and a description.
SKILL.md exists, its frontmatter parses, and it declares a name and a description.
No undeclared network calls: passed
Makes no network calls.
Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.
No obfuscated payloads: passed
No encoded or obfuscated payloads.
No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.
No credential access: passed
Reads no keys, tokens, keychains or credential files.
Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.
No pipe-to-shell installers: passed
No pipe-to-shell or download-and-run installers.
No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.
Pinned to a commit: passed
Scanned laurigates/claude-plugins at 45d1d7dcf6.
The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.
- Commit
- 45d1d7dcf6
- Scanned
- 2 files, 743 lines
About this skill
What it does
This skill enables AI agents to perform mutation testing, a technique that validates code quality by introducing small faults (mutations) into source files and verifying if existing tests detect them. It helps ensure test suites are robust enough to catch real bugs rather than just passing trivially.
When to use it
- Validate Test Robustness: Confirm that your current unit tests actually verify logic instead of ignoring errors.
- Prevent Regression: Run before major refactors to ensure new code doesn't break existing test coverage.
- Improve Code Quality: Identify weak spots in the testing strategy where mutations slip through undetected.
- Audit Legacy Systems: Assess the reliability of tests in older codebases that may lack comprehensive coverage.
Key capabilities
- Automatically generates mutant versions of your code by injecting specific faults.
- Executes existing test suites against these mutated versions.
- Reports which mutations were successfully killed (detected) and which survived.
- Provides actionable insights on where test coverage is insufficient.
Example prompts
- "Run mutation testing on my Python project to see if my tests catch logic errors."
- "Analyze the mutation report and tell me which functions have the lowest fault detection rates."
- "Generate mutants for this specific JavaScript module and run the full test suite against them."
Tips & gotchas
Mutation testing can be computationally expensive, so it is best suited for smaller codebases or targeted modules rather than entire large-scale applications. Ensure your test environment is stable before running, as false positives in the mutation process could lead to unnecessary debugging efforts.