Runs a chat completion against a workspace agent and persists the conversation. Creates a new chat when chatId is omitted. Returns JSON by default, or a Server-Sent Events stream of AI SDK UI-message chunks when stream is true. Agents with multi-agent orchestration enabled require stream: false.
Completion result. Note this endpoint returns the payload directly, without the data envelope used by other endpoints. When stream: true, the response is text/event-stream instead.
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