# Pattern Extraction

> Identify recurring patterns and abstractions in a codebase for documentation and reuse. Use when this capability is needed.

- Skill: `tomevault-io/pattern-extraction-2` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/pattern-extraction-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/pattern-extraction-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Docs & Writing
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/pattern-extraction-2

---


# Pattern Extraction Skill

## Purpose
Identify recurring patterns and abstractions in a codebase for documentation and reuse.

## Pattern Categories

### 1. Structural Patterns
- Module organization
- Layer architecture
- Feature-based structure
- Shared utilities location

### 2. Code Patterns
- Error handling approach
- Validation patterns
- Data transformation patterns
- API client patterns

### 3. Testing Patterns
- Test file organization
- Mock/stub conventions
- Fixture patterns
- Integration test setup

### 4. Component Patterns
- Component composition
- Prop patterns
- State management
- Event handling

## Extraction Process

1. **Sample Selection** - Choose representative files
2. **Pattern Identification** - Note recurring structures
3. **Validation** - Verify pattern is consistent across codebase
4. **Documentation** - Write pattern description with examples
5. **Counter-Examples** - Note exceptions and why they differ

## Pattern Documentation Template

```markdown
## Pattern: [Name]

### Intent
What problem does this pattern solve?

### Structure
How is it organized?

### Example
```code
// Representative example
```

### When to Use
Guidelines for when to apply this pattern.

### Variations
Acceptable variations seen in codebase.
```

---
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