What problem does it solve? When an implementation task is blocked, verification fails, or repeated fixes do not converge, guess-first patching wastes effort and hides the real issue. This Skill enforces evidence-driven root cause investigation before any fix is proposed. ## Core Features & Use Cases - Root Cause Classification: Categorizes failures into types such as MISSING_DEPENDENCY, RUNTIME_MISMATCH, CONFIG_GAP, LOGIC_ERROR, or SPEC_CONFLICT. - Evidence Gathering Workflow: Reads exact error output, inspects repository state (package.json, tsconfig, git diff), and optionally searches official documentation and issue trackers. - Structured Debug Report: Produces ROOT_CAUSE, CATEGORY, FIX_PLAN, VERIFICATION, NEXT_ACTION (RETRY_TASK, BLOCK_TASK, or STOP_FOR_HUMAN), and CONFIDENCE fields. - Use Case: An implementer reports BLOCKED after two failed remediation attempts on a build error. This Skill inspects the error, dependency versions, and runtime config, identifies a native ABI mismatch, and returns a minimal fix plan with verification commands. ## Quick Start Investigate why my build keeps failing after two fix attempts and produce a root cause debug report with the smallest safe fix plan.