Message sent successfully. Returns an event stream of Message objects.

Authentication required. No valid session cookie or bearer token provided, or authentication failed.

Tenant has no remaining tool calls. The request cannot be completed.

The chat could not be found.

Chat is busy. Returns an event stream of the running chat.

The payload exceeds the model's context window.

The payload is not valid according to the input JSON schema of the agent.

Internal server error during request processing.