List all sessions.
Response:
Get full session data including messages.
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Get message history for a session.
Delete a session.
Send a message and receive streaming response via SSE.
Request:
If session_id is omitted or null, a new session is created automatically.
session_id
null
Response: Server-Sent Events stream:
Cancel an active run.
Server health check.
List registered agents.
All endpoints return 404 when a session is not found:
404