The agent-ready web platform arrives at once

Safari 27 is one of the biggest WebKit releases in years, and the headline feature is aimed at machines rather than humans: a built-in MCP server that lets AI agents inspect and debug a live page. Instead of agents guessing at rendered state from screenshots or DOM dumps, the browser itself becomes a callable tool surface. Scroll anchoring and a fully customizable <select> round out a drop that is less about one marquee feature and more about the platform quietly broadening who — or what — a browser serves.

The same shift is happening across the ecosystem. Microsoft's Edge for developers update ships WebMCP, letting any page expose tools to agents, alongside OpaqueRange for text-range UIs. And the AG-UI protocol — already first-class in TypeScript and Python for CopilotKit-style frontends — now has an official .NET SDK at 1.0, contributed by Microsoft's ASP.NET Core team, so any .NET backend can expose or consume agent UIs. Browsers, protocol layers, and server runtimes are converging on the same bet: the web's next client is an agent, and the stack is racing to greet it natively.