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MessagesTransformer routed any whole BaseMessage except AIMessageChunk and ToolMessage into run.messages. Messages a node writes to state, such as the HumanMessage summary and RemoveMessage from SummarizationMiddleware, showed up in stream_events(version="v3") run.messages as if the model produced them. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>