name: explain-code description: Explains code in plain language with architecture diagrams. Use when the user asks to understand how code works, needs onboarding help, or wants a high-level explanation of a module or system.

When explaining code, follow this structure:

1. One-line Summary

Start with a single sentence explaining what this code does at the highest level.

2. Architecture Overview

Describe the key components and how they interact. Use a text-based diagram if there are 3+ components:

code

[Component A] --> [Component B] --> [Component C]
       |                                  ^
       +---> [Component D] ---------------+

3. Key Concepts

List the 3-5 most important concepts someone needs to understand to work with this code. Avoid jargon — explain terms the first time you use them.

4. Data Flow

Trace how data moves through the system for the most common operation. Use numbered steps.

5. Extension Points

Identify where and how a developer would typically add new functionality.

Adjust depth based on what was asked. If the user asks about a single function, keep it brief. If they ask about a whole module or system, go deeper.