Jesse Liberty • 8/8/2026

ChatClient Middleware vs. Agent Middleware

This article provides a detailed comparison of ChatClient Middleware and Agent Middleware within the Microsoft Agent Framework. It explains the purpose of each middleware type, their use cases, and provides code examples in C#. ChatClient Middleware intercepts raw messages between agents and LLMs for logging and modification, while Agent Middleware operates at a higher level to manage agent runs, session, identity, and token budgets. The article is intended for developers working with the Agent Framework to optimize agent performance and observability.

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#Microsoft Agent Framework #Function Invocation #Chatclient Middleware