fix( langchain): resolve dependency version conflicts #33815
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LangChain 1.0.3 depends on LangGraph with a version requirement of >=1.0.2 and <1.1.0, while LangGraph 1.0.2 itself has a dependency on langgraph-prebuilt. If a different version of langgraph-prebuilt is installed manually, or if there is inconsistency in dependency resolution, it may lead to version conflicts.
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Description: Resolve the dependency issue between create_agent (in LangChain 1.0.3) and langgraph-prebuilt 1.0.2. LangChain 1.0.3 depends on LangGraph with a version requirement of >=1.0.2 and <1.1.0, while LangGraph 1.0.2 itself has a dependency on langgraph-prebuilt. If a different version of langgraph-prebuilt is installed manually, or if there is inconsistency in dependency resolution, it may lead to version conflicts. create_agent is imported from langgraph.prebuilt.tool_node, so ensure that langgraph-prebuilt is version-compatible with LangGraph. It is recommended that users let LangGraph’s dependency system automatically resolve langgraph-prebuilt, instead of installing a conflicting version manually.