Creates a new thread and sends the first message. Supports both direct (single agent_id) and group (agent_ids array) creation. For group threads, dispatches to all running agents and returns three-array response (dispatched/skipped/failed). Max 8 agents per group.
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Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Single agent UUID (creates direct thread)
Multiple agent UUIDs (creates group thread)
8Designate a lead agent for collaborative group threads. Must be one of the agent_ids. When set, only the lead agent receives dispatch with collaborator context. Other agents serve as queryable collaborators.