Your build is green — but did the agent make it green by weakening the tests? mumei re-runs them from a clean HEAD, freezes what must not be tuned, and reads the diff for deleted tests and suppressed errors. Enforced in Hooks, not asked for in a prompt.

Test-integrity firewall for coding agents that protects trusted tests and binds completion evidence to the checked repository state.

Test integrity for AI coding agents: the context that grades the tests is isolated from the one that writes the code, and test quality is enforced by scripts with real exit codes — not prose. Claude Code plugin: /fofo:sdlc