What problem does it solve? When a bug, test failure, or unexpected behavior is reported, jumping straight to a fix often treats the symptom instead of the cause. This Skill enforces a disciplined, read-only investigation that traces the bad value back to its origin and verifies the root cause with concrete evidence before any fix is proposed. ## Core Features & Use Cases - Parallel investigation angles: Fans out sub-agents (or sequential passes) across reproduction, recent changes via git history, backward root-cause tracing, and blast-radius analysis. - Adversarial verification: Spawns an independent sub-agent whose job is to refute the leading hypothesis, so only evidence-backed root causes survive. - Source-level fix proposals: Recommends fixes at the origin of the bug, with optional defense-in-depth hardening guidance, and hands off to the fix skill for implementation. - Use Case: A CI test suite starts failing after a dependency update. Invoke triage with the failing test output; it reproduces the failure, traces the bad value through the call chain, verifies the root cause against git diffs, and reports the exact file:line evidence plus a recommended fix. ## Quick Start Ask the agent to triage the failing test or bug report by pasting the error message or issue description and requesting a root-cause diagnosis.