How

Explore the codebase to answer "how does X work?" questions. Produce clear architectural explanations at the level of a senior engineer onboarding onto a subsystem, enough to build a working mental model, not so much that it reads like annotated source code.

Two modes:

1. Explain (default). Explore the codebase and produce a clear explanation
2. Critique. Explain first, then spawn multiple models to independently identify architectural issues

Explain Mode

Step 1. Understand the Question and Assess Complexity

Parse what the user is asking about. They might say:

• "How does the rate limiter work?", a subsystem
• "How do we handle billing for on-demand usage?", a feature flow
• "How is the auth service structured?", an architectural overview
• "Walk me through what happens when a user submits a form", a runtime trace