Expired50% confidenceFactExact time
In LangGraph, each message field uses the add_messages reducer by default; nodes only need to return newly added messages, and the framework automatically appends them to the history list rather than overwriting it.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/12/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 10/10/2026(expired)
Sources
Getting Started with LangGraph: Building AI Agent Workflows with Graph Structures
bilibili吴恩达LLM7/10/2026
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