refactor: migrate to langchain v1#21
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vrtornisiello merged 3 commits intostagingfrom Mar 10, 2026
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The new `create_agent` function from `langchain.agents` is the standard way to
build agents in LangChain v1. It provides a simpler interface while offering greater customization potential through middleware.
Key changes:
- Replace custom `ReActAgent` with `create_agent`
- Replace custom `trim_messages_before_agent` hook with built-in `SummarizationMiddleware`
- Replace custom recursion limit handling with `ModelCallLimitMiddleware`
- Update `_process_chunk` to handle the new node names ("model" instead
of "agent", "ModelCallLimitMiddleware.before_model" for limit events)
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Migrate agent creation to LangChain's
create_agentfunction.The new
create_agentfunction fromlangchain.agentsis the new standard way to build agents in LangChain v1. It provides a simpler interface while offering greater customization potential through middleware.Key changes:
ReActAgentwithcreate_agenttrim_messages_before_agenthook with built-inSummarizationMiddlewareModelCallLimitMiddleware_process_chunkto handle the new node names ("model" instead of "agent", "ModelCallLimitMiddleware.before_model" for limit events)