What problem does it solve? Making changes across multiple files without understanding dependencies leads to cascading failures, broken tests, and unexpected side effects. This Skill provides a structured process to identify targets, map upstream and downstream dependencies, and assess risk before any implementation begins. ## Core Features & Use Cases - Dependency Mapping: Identifies direct target files plus upstream dependencies and downstream consumers, including tests and documentation. - Blast Radius Assessment: Classifies changes into GREEN (<5 files), YELLOW (5-10 files), or RED (>10 files) zones with concrete action recommendations per zone. - Reusable Template: Provides a ready-to-use context map template covering targets, dependencies, risk factors, existing tests, and a scope decision. - Use Case: Before renaming an authentication module, map that it touches the handler, middleware, API routes, and tests, determine the change is YELLOW zone, and create a checkpoint before proceeding. ## Quick Start Ask the agent to map the blast radius and dependencies for the planned change before modifying any files.