Guide — Updated August 2026

Foundry Agent Service Architecture Guide

How Foundry Agent Service is built — the Responses API, Agent Runtime, agent types, tools, and the object model that replaced Assistants.

Foundry Agent Service changed the agent object model and API. This guide explains how it is architected and how to design reliable agents on it.

This guide explains Foundry Agent Service architecture: the Responses API (Agents v2) that replaced the Assistants API, the Conversations/Items/Responses/Agent Versions object model, the Agent Runtime that hosts and scales prompt and hosted agents, the Responses and Invocations protocols, tools (web search, file search, code interpreter, custom functions, OpenAPI, MCP) and Toolboxes, memory, A2A, tracing, and evaluation. It also covers migrating off the Assistants API (retires August 26, 2026) and the classic Agent Service (retires March 31, 2027).

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This guide explains Foundry Agent Service architecture in practical terms — what it is, how it works on Azure day to day, the common production problems and how they are handled, and how professional support fits in. It reflects the Microsoft/Azure product state through August 2026 and is written for working Azure AI/ML professionals and candidates who want clear, real-world answers rather than marketing.

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Azure AI Engineers, Microsoft Foundry engineers, Azure OpenAI developers, Azure ML and MLOps engineers, data scientists, and anyone preparing for Azure AI/ML roles or currently working on Azure AI projects who wants to understand the topic clearly and avoid common mistakes.

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