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gauntlet

A local tool and Claude Code plugin that runs a Python project's tests, measures how good those tests really are, and fails when the code is not proven, so you read evidence instead of an agent's diff.

  • Python
  • Claude Code
  • Mutation testing

gajeshbhat/gauntlet on GitHub

Highlights

  • Gates on CRAP score (limit 8) and mutation score (90% of planted bugs caught), with mutmut or cosmic-ray.
  • Built for an untrusted author: limits live outside the repo, gates fail closed, and results are hashed against the source.
  • Language-agnostic core with a Python plugin; optional OpenShell sandbox; ships as a Claude Code plugin.

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