What problem does it solve? Fixing a bug is only half the job—developers often lack confidence about whether a fix truly addresses the root cause or silently breaks callers, edge-case paths, or concurrent behavior. This Skill produces a structured impact analysis report so fixes ship with evidence, not guesswork. ## Core Features & Use Cases - Root Cause Diagnosis: Traces the causal chain from symptom to root cause and classifies it as systemic defect, implementation gap, dependency change, or one-off mistake, flagging similar-risk locations. - Multi-Dimensional Impact Analysis: Examines call chains (vertical), conditional/parameter paths (horizontal), data flow (return values, side effects, exceptions), and execution scenarios (concurrency, retries, degradation) to map what the fix affects. - Regression Risk & Test Recommendations: Grades risks as high/medium/low and outputs a prioritized test checklist and action items. - Use Case: Before merging a hotfix that changes a function's return type, run this Skill to discover which callers rely on the old semantics, which parameter paths changed behavior, and which tests must be added. ## Quick Start Analyze the impact of this bug fix and evaluate its regression risk based on the attached diff and bug description.
