Kills fake, low-value, or bug-locking tests — tests that assert nothing meaningful, tests that mock the very unit under test, and tests that assert CURRENT (possibly buggy) behavior instead of correct behavior. Best used reactively after tests are written, generated, or changed. Use when the user says "add tests", "write unit tests", "increase coverage", "is this tested?", or after a coding agent produced or modified test code. DO NOT USE for production (non-test) code review (use clean-diff-guard) or for verifying a task is done (use evidence-before-done); this guard reviews TEST code quality specifically.
