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LangChain 解释 agent 会话中的 trajectory 概念
LangChain 官方账号说明 trajectory 是一种对话式 agent 会话视图，聚合人类消息、AI 消息、工具消息和系统提示，覆盖主 agent 及子 agent，并按首次出现顺序展示。
AI推荐理由 LangChain 官方账号对 LangSmith Trajectories 概念的补充说明，明确列出 trajectory 聚合人类消息、AI 消息、工具消息、系统提示，并覆盖主 agent 与子 agent 的首次出现顺序。属于产品概念解释而非新发布，信息密度中等，无独立验证。
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What is a trajectory?
A conversational view of an agent session that pulls together:
✅ Human messages
✅ AI messages
✅ Tool messages
✅ System prompts
…across the main agent + any subagents, then shows them in the order they first appeared.
LangChain@LangChain
Introducing Trajectories in LangSmith.
A view of agent behavior that everyone on the team can understand at a glance. [langchain.com/blog/langsmith…](https://www.langchain.com/blog/langsmith-trajectories-tracing)
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