Microsoft Foundry Toolkit for VS Code Reaches General Availability With Agent Builder, 100+ Models, and MCP Tool Approval

Microsoft renamed its AI Toolkit for VS Code extension to Microsoft Foundry Toolkit and released it as generally available on April 17, 2026, according to the Microsoft Community Hub announcement. The extension now functions as a complete agent development environment inside VS Code, from initial model experimentation through production deployment.

What Changed at GA

The GA release consolidates several capabilities into a single extension, per Microsoft’s deep dive post:

Agent Builder is a low-code interface for defining agent instructions, attaching tools, and testing conversations without writing boilerplate code. Developers can write instructions, refine them with a built-in Prompt Optimizer that analyzes and suggests improvements, connect tools from the Foundry public catalog or local MCP servers, and configure whether MCP tool calls need human sign-off or can run automatically. The result is a working, testable agent in minutes, according to Microsoft.

Model Catalog spans 100+ models from cloud providers (GitHub, Microsoft Foundry, OpenAI, Anthropic, Google) and local runtimes (ONNX, Foundry Local, Ollama). The Model Playground supports side-by-side model comparison, multimodal file attachments, and streaming responses. View Code generates ready-to-use snippets in Python, JavaScript, C#, or Java from any tested interaction, per Microsoft.

MCP tool approval is the governance feature. Per the deep dive, developers can “decide whether tool calls need your sign-off or can run automatically.” This gives teams per-agent control over which MCP actions execute autonomously and which require explicit human approval.

Agent Inspector provides real-time debugging with VS Code breakpoints, variable inspection, step-through execution, and workflow graph visualization. Local tracing captures the full execution span tree across tool calls and delegation chains without external infrastructure, according to Microsoft.

Open-Source Agent Framework

Alongside the extension, Microsoft published the microsoft/agent-framework repository on GitHub. The open-source SDK supports building and deploying AI agents in Python and .NET with Azure Foundry integration. The extension generates scaffolding code for Agent Framework, LangGraph, and other orchestration frameworks.

From Prototype to Production

When an Agent Builder prototype is ready for production, a single click exports it to a code project with the agent’s instructions, tool configurations, and scaffolding included. One-click deployment then packages the agent and deploys it to Microsoft Foundry Agent Service as a hosted agent. GitHub Copilot integration with the Microsoft Foundry Skill can generate agents, write evaluations, or scaffold multi-agent workflows using the Agent Framework patterns, per the announcement.

Developer Tooling Convergence

The Foundry Toolkit GA lands in the same week as Cursor 3.1 Canvas, Salesforce Headless 360 with 60+ MCP tools, and Cloudflare Browser Run. April 17 is shaping up as a developer tooling inflection point for AI agents, with multiple major environments shipping production-grade agent building capabilities simultaneously. Microsoft’s play puts agent development directly inside VS Code, the most widely used developer IDE.