Exposing a Microsoft Foundry Agent over A2A Through Azure API Management — The Click-by-Click Guide

This guide provides a step-by-step walkthrough for exposing Microsoft Foundry agents via the Agent2Agent (A2A) protocol using Azure API Management (APIM). By placing an API gateway in front of Foundry agents, developers can centralize governance, enforce rate limits, and manage security policies through a unified interface. The article covers the necessary configurations, including setting up managed identities for secure authentication between APIM and Foundry, assigning appropriate IAM roles, and implementing custom policies to handle A2A protocol versioning. It also addresses common pitfalls, such as handling authentication failures during the initial import and ensuring correct JSON-RPC message formatting for testing. This approach allows organizations to treat AI agents as standard API resources, ensuring consistent management and observability across distributed agent architectures.