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Mutation Testing

Checked
metabase·vlatest·testing

Automatically generates and executes Metabase query mutations to identify potential data model vulnerabilities and improve reliability.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add metabase/metabase --skill mutation-testing -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

metabase

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.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

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 metabase/metabase at 674c8b8dc6.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
674c8b8dc6
Manifest
.claude/skills/mutation-testing/SKILL.md
Scanned
1 file, 103 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill automatically performs mutation testing on Metabase code, identifying potential data model vulnerabilities and improving reliability. It generates coverage reports, uses Claude to write tests, verifies mutations, and creates draft pull requests with associated Linear issues. The process is end-to-end, designed specifically for the Metabase development environment.

When to use it

  • To proactively identify weaknesses in Metabase's data model logic.
  • When introducing significant changes or refactoring existing code within Metabase.
  • As part of a continuous integration/continuous delivery (CI/CD) pipeline for Metabase development.
  • To improve the overall robustness and test coverage of Metabase features.

Key capabilities

  • Generates mutation testing reports.
  • Groups functions based on coverage relationships.
  • Utilizes Claude to automatically generate tests.
  • Creates Linear issues and draft pull requests for identified vulnerabilities.
  • Supports specifying a base branch for comparisons.
  • Allows associating issues with an existing Linear project.

Example prompts

  • /mutation-testing metabase.lib.order-by - Runs mutation testing on the metabase.lib.order-by namespace.
  • /mutation-testing metabase.lib.order-by --base-branch release-x.52.x - Runs mutation testing with a specified base branch.
  • /mutation-testing metabase.lib.order-by --project-id abc-123 - Runs mutation testing and associates issues with the Linear project abc-123.

Tips & gotchas

  • Requires a running nREPL connected to the Metabase development environment.
  • You must have a valid LINEAR_API_KEY environment variable set, gh CLI authenticated with GitHub, and the claude CLI available on PATH.
  • For the first invocation or after a REPL restart, you'll need to configure the Linear team ID using mut-test/set-config!.