Payload of a thinking_started stream event — the Agent has entered the reasoning phase (analyzing the question, planning tool calls). Between this and ThinkingFinished, Message events with messageType == "think" and tool-call events may arrive.
thinking_started
ThinkingFinished
Message
messageType == "think"
Start time, Unix timestamp in seconds
Payload of a
thinking_startedstream event — the Agent has entered the reasoning phase (analyzing the question, planning tool calls). Between this andThinkingFinished,Messageevents withmessageType == "think"and tool-call events may arrive.