LangChain 1.0 introduces a new Middleware abstraction to solve the flexibility limitations of traditional agent frameworks. The middleware system allows developers to customize agent behavior through before_model, after_model, and modify_model_request hooks, providing better control over context engineering while maintaining composability. This addresses the common issue where developers abandon agent frameworks for custom code when building production-ready applications.

6m read timeFrom blog.langchain.com
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Why it is hard to bring this abstraction to productionOur journey to make it more reliableWhat we’re doing in LangChain 1.0Try it in LangChain 1.0alpha

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