Core API

Declare the boundary, implement its behavior, construct clients, and control values and failures.

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Paths, inputs, responses, routers, and shared schemas.

Exhaustive handlers, middleware, context, and fragments.

Selections, calls, middleware, and response narrowing.

Parameters, query, headers, bodies, and native JSON.

One-way schemas, transforms, and bidirectional codecs.

Declared application failures and operational errors.