Explaining architecture

Answer "how does X work?" with the mental model a senior engineer needs to start working in an unfamiliar subsystem: its architecture, flow, and sharp edges, not annotated source code.

When the question is about motivation, rejected alternatives, or history rather than mechanics, call the Skill tool with investigating-design-rationale instead. If that skill is not installed, say so and answer the mechanics only. Without a Skill tool, follow the skill call rules.

The skill is read-only: it writes no files and changes no state.

Input