What problem does it solve? When tests fail, builds break, or runtime behavior diverges from expectations, developers often guess at fixes or patch symptoms instead of root causes, wasting hours and letting errors compound. This Skill enforces a structured triage process that stops feature work, preserves evidence, and drives the fix to the actual root cause. ## Core Features & Use Cases - Structured Triage Checklist: Six-step workflow covering reproduce, localize, reduce, fix root cause, guard against recurrence, and verify end-to-end. - Layer-Based Fault Localization: Decision trees for narrowing failures across UI, API, database, build tooling, external services, and DaaS backends, plus git bisect guidance for regression bugs. - DaaS and Next.js Debugging Guides: Pre-mapped problem-to-root-cause tables for common DaaS issues (CORS, RBAC, hooks, permissions) and Next.js build failures (type, import, config, dependency errors). - Use Case: A QC review page shows an empty collection list. Instead of adding a fallback empty array, the Skill guides you to trace the failure to a DaaS CORS wildcard misconfiguration, fix the origins, and add a regression test. ## Quick Start Ask the AI to systematically debug the failing test or broken build by reproducing the error, localizing the failing layer, and fixing the root cause with a regression test.
