Verify

This is the antidote to "looks good to me" without actually checking. It enforces a verification workflow before claiming anything is done: run existing tests first, fall back to typechecks or narrow commands, and if you have to verify manually, document what you actually observed. The four-tier hierarchy (tests, build, direct commands, manual validation) keeps you honest about what was proven versus what was assumed. Useful when you're working on unfamiliar codebases or want to avoid the classic "it works on my machine" followed by immediate bug reports. It won't let you or Claude hand-wave completion without concrete evidence.