API and Interface Design guides developers and agents in creating stable, well-documented interfaces that are hard to misuse. It covers contract-first development, consistent error semantics, boundary validation, and idempotent request handling. Reach for this skill when designing REST endpoints, GraphQL schemas, module boundaries, or component prop interfaces.
Key Features
Contract-first development guidance
Consistent error semantics and status codes
Boundary validation principles
Idempotency key implementation patterns
Privacy & Security
Data Collection
This tool follows industry-standard security practices and only collects data necessary for functionality.