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api-design-knowledge

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API Design knowledge base. Provides REST constraints, Richardson Maturity Model, HTTP semantics, content negotiation, and GraphQL/gRPC comparison for API audits and generation.

skills/api-design-knowledge/SKILL.md

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# API Design Knowledge Base

Quick reference for API design patterns, REST best practices, and PHP implementation guidelines.

## Core Principles

### REST Constraints

| Constraint | Description | Implication |
|-----------|-------------|-------------|
| Client-Server | Separation of concerns | Independent evolution |
| Stateless | No server-side session state | Each request contains all info |
| Cacheable | Responses declare cacheability | Reduces server load |
| Uniform Interface | Standard resource operations | Predictable API surface |