fix(runtime): decouple summarization from state persistence to preserve full conversation history (#1393)#1430
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sjhddh wants to merge 1 commit intobytedance:mainfrom
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fix(runtime): decouple summarization from state persistence to preserve full conversation history (#1393)#1430sjhddh wants to merge 1 commit intobytedance:mainfrom
sjhddh wants to merge 1 commit intobytedance:mainfrom
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…ve full conversation history (bytedance#1393)
yanglinzhi
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Mar 27, 2026
…estructive state overwriting
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Fixes #1393 and #1000.\n\nCurrently, the native
SummarizationMiddlewarereplaces the conversation history instate["messages"]with a generated summary plus a trailing window of messages. This permanently erases the original history from LangGraph checkpoints, causing the frontend to render truncated dialogue histories upon page refresh.\n\nThis patch introduces aSafeSummarizationMiddlewarewrapper that hijacksSummarizationMiddleware.abefore_model. Instead of returning a destructive state update withRemoveMessage(id=REMOVE_ALL_MESSAGES), it captures the summarized window and injects it directly into theModelRequest.messagesviaawrap_model_call. \n\nThis ensures that the token reduction strictly applies to the current inference window passed to the LLM, while leaving the authoritativestate["messages"]and DB checkpoints completely intact and immutable.