Unverified50% confidenceFactExact time
StreamWriter is a writer injected by LangGraph inside the tool function, and tools can push custom data to the event stream via writer("message content").
1
Sources
50%
Confidence
Long-term
Relevance
10/25/2026
First Seen
Sources
LangChain Agent Event Streaming Explained: A Practical Guide
bilibili老鱼干Pro10/24/2026
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