Microsoft Build 2026: What Was Announced, and What It Means for the Agent Stack

At Microsoft Build 2026, CEO Satya Nadella announced that the Model Context Protocol (MCP) is now the default integration layer across the entire Microsoft platform stack, including Foundry, Agent 365, IQ context services, Teams SDK, and Copilot. Arcade’s analysis notes that monthly MCP downloads grew from approximately 100,000 in November 2024 to 97 million by March 2026, with 78% of enterprise AI teams now running at least one MCP-backed agent in production. The post examines what the Microsoft announcements mean for teams building on the agent stack in 2026.