A four-phase framework that forces you to find root causes before touching any code. The iron law is simple: no fixes without investigation first. It walks you through reading error messages completely, reproducing bugs consistently, tracing data flow through multi-component systems, and comparing against working examples before you're allowed to propose solutions. The real teeth are in Phase 4: if three fixes have failed, stop and question whether the architecture itself is wrong rather than attempting fix number four. Especially useful when you're under pressure and tempted to guess, or when each attempted fix reveals a new problem somewhere else in the system.
npx skills add https://github.com/secondsky/claude-skills --skill systematic-debugging