An open-source SDK and runtime for building and orchestrating LLM agents and multi-agent workflows in .NET and Python. Individual LLM agents can call tools, APIs, and MCP servers. It supports graph-based workflows with checkpoints, long-lived state, and type-safe routing, and implements security policies for enterprise scenarios. Built-in monitoring capabilities via Microsoft services enable analysis of LLM errors, hallucination diagnosis, workflow debugging, cost optimization, understanding real workload profiles, and meeting audit/security requirements. Microsoft Agent Framework integrates closely with Azure AI Foundry, Azure/OpenAI, and the Microsoft 365 Agents SDK, and supports open standards such as MCP, OpenAPI, and Agent2Agent.