Module error 

What can go wrong before the stream starts, and what the client sees.

Everything here happens before RUN_STARTED. Once the SSE body is open the status line is already sent, so failures from then on are RUN_ERROR events inside a 200 stream — that is crate::server’s job, not this module’s. What is left is the handful of ways a request can be refused: a body that is not AG-UI JSON, and an Accept header this build cannot satisfy.

A refusal answers with a JSON object rather than a bare status line, because the caller is a program:

{"code": "INVALID_INPUT", "message": "missing field `messages` at line 1 column 34"}

Enums

Error

A request this endpoint refused, before any events were produced.

Type Aliases

Result

Result alias for this crate.