Solid coverage of both REST and GraphQL design patterns with practical examples you can actually use. The skill walks through resource-oriented URL design, proper HTTP method semantics, pagination strategies, and error handling patterns. For GraphQL, it covers schema-first development, resolver patterns, and Relay-style connections. What I like is the concrete code examples showing FastAPI implementations and real schema definitions rather than just theoretical advice. You'll want this when establishing API standards for a team or when you're designing a new API and need to make sure you're following proven patterns rather than reinventing the wheel.
npx skills add https://github.com/wshobson/agents --skill api-design-principles