Array field: homogeneous typed elements with length constraints.

Blob field constraints.

HTTP body schema for query output / procedure input+output.

Boolean field constraints.

Bytes field constraints.

A named definition within a Lexicon document.

An XRPC error response.

A complete Lexicon document (one per NSID).

Integer field constraints.

Object type: named properties with required/nullable lists.

Query/procedure parameter object (restricted to boolean, integer, string, unknown, array).

A single permission entry in a permission set.

Permission set definition: OAuth scope bundle.

Procedure definition: POST XRPC endpoint.

Query definition: GET XRPC endpoint.

Record definition: data stored in AT Protocol repos.

Reference to another type definition.

String field constraints.

String format constraint for string-typed fields.

Subscription definition: WebSocket event stream.

Subscription message schema (must be a union).

A token definition (string constant).

A field type in a Lexicon schema. Recursive (arrays/objects contain nested types).

Union of multiple referenced types, discriminated by $type at runtime.