Reply to agent question
Answers a pending runtime question for the chat session bound to this agent chat.
POST
Authorizations
API key starting with sk_case_
Body
application/json
Answer selections for each prompt element in the pending question
Response
Question answered successfully
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Respond to chat message (streaming)Streams a single assistant turn as normalized SSE events with stable turn, message, and part IDs. Emits events: `turn.started`, `turn.status`, `message.created`, `message.part.updated`, `message.completed`, `session.usage`, `turn.completed`.
**When to use this endpoint:** Recommended for building custom chat UIs that need real-time streaming progress. This is the primary streaming endpoint for new integrations.
**Alternatives:**
- `POST /chat/:id/message` — synchronous, returns complete response as JSON (best for server-to-server)
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