Forces you to find root cause before attempting any fix, no exceptions. Use it for test failures, bugs, unexpected behavior, anything broken. The core discipline is completing Phase 1 investigation (read errors, reproduce consistently, gather evidence across system boundaries, trace data flow) before even thinking about fixes. It catches the classic thrashing pattern where you're on your third attempted fix without understanding the problem. Includes a hard stop rule: if three fixes failed, question the architecture instead of trying fix number four. The "human partner signals" section is brutally honest about when you're guessing instead of investigating.
npx skills add https://github.com/sickn33/antigravity-awesome-skills --skill systematic-debugging