When to use

user is designing a new API endpoint, route, server action, or RPC contract
user is implementing request validation or boundary error handling
user is reviewing server boundary code for correctness or security
user is working with request/response schemas, RPC definitions, or middleware
user is adding authentication or authorization to an inbound server boundary
Use when implementing any endpoint handler, route handler, or server boundary middleware
Use when writing request/response schemas or API contract types
Use when reviewing boundary code for security, correctness, or maintainability
Use when designing the error response envelope for an API surface

Outputs