Web Reference: Python API reference for middleware in langchain. Part of the LangChain ecosystem. Nov 17, 2025 · Reach for LangChain middlewares when you want to standardize behaviors inside an agent: things like logging, monitoring, context injection, safety filters, or retry logic. Jan 24, 2026 · This document describes the middleware architecture for LangChain agents created with create_agent. Middleware provides extensibility points to intercept and modify agent execution at specific lifecycle stages, enabling features like context engineering, guardrails, logging, and error handling.
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