explain

Explain a code file, function, or concept in clear, structured language.

Steps

1. Read the target code (file path, function name, or code block).
2. Determine the audience level from context (junior, mid, senior, non-technical).
3. Analyze the code structure:
   • Purpose: What problem does this code solve?
   • Inputs: What data does it receive and from where?
   • Processing: What transformations or logic does it apply?
   • Outputs: What does it produce or modify?
   • Side effects: What external state does it change?
4. Break down complex sections:
   • Explain algorithms step by step.
   • Clarify language-specific idioms or patterns.
   • Describe the data flow through the code.
5. Identify design patterns in use (Observer, Strategy, Factory, etc.).
6. Note any non-obvious behavior, gotchas, or edge cases.
7. Provide analogies for complex concepts when appropriate.

Format

## <File/Function Name>

### Purpose
<one-sentence summary>

### How It Works
1. <step-by-step explanation>

### Key Concepts
- <pattern/concept>: <explanation>

### Gotchas
- <non-obvious behavior to be aware of>

### Dependencies
- <what this code depends on>
- <what depends on this code>

Rules

• Explain the "why" not just the "what"; anyone can read the code.
• Use concrete examples with real values from the codebase.
• Avoid jargon unless explaining it; match the audience level.
• Keep explanations under 100 lines; link to deeper resources for complex topics.
• Do not restate code as prose; explain the intent and reasoning behind it.