What problem does it solve? Understanding how an unfamiliar subsystem works requires hours of manual code reading, and ad-hoc explanations often miss cross-cutting flows or key abstractions. This Skill answers "how does X work" questions by systematically exploring the codebase and producing a senior-engineer-level architectural explanation. ## Core Features & Use Cases - Complexity Assessment: Routes simple questions to a single-pass explainer and complex subsystem questions to parallel explorers plus a synthesizer. - Parallel Exploration: Spawns 2-4 read-only explorer subagents, each tracing a distinct angle of the subsystem with a structured findings template. - Structured Explanations: Produces explanations with Overview, Key Concepts, How It Works, Where Things Live, and Gotchas sections, including mermaid or ASCII diagrams where useful. - Use Case: Before modifying a payment flow spanning multiple modules, ask how it works and receive a unified walkthrough of entry points, data flow, file locations, and non-obvious behavior. ## Quick Start Ask the agent to explain how the authentication flow works in this repository before making changes to it.