Xcode 27 goes agent-native — and it's the practical Apple story from WWDC

The keynote got the Siri headlines, but the developer story worth your attention is Xcode 27's agentic overhaul. You can now run Anthropic, Google, and OpenAI agents directly inside Xcode, with interactive planning, multi-turn Q&A, and a canvas that renders Markdown, diffs, and previews side by side.

The part that actually changes how long an agent can run unattended: Xcode now gives agents the tools to validate their own work — writing and running tests, trying ideas in isolated Playgrounds, checking visual changes through previews, and driving the simulator via a new Device Hub. Plug-ins let you add custom skills, wire in tools over MCP, and connect any agent that speaks the Agent Client Protocol (ACP); GitHub and Figma ship one-click integrations.

For engineers, this is Apple adopting the same open agent plumbing (MCP, ACP) the rest of the ecosystem standardized on, rather than a walled garden — which means your existing skills and MCP servers travel into Xcode. Note the split: inline completion runs on-device, but routing a task to a third-party agent does send that code off the machine, and it's opt-in.

Sources: Apple Newsroom, Tech Times: Xcode 27 on-device AI, Technetbook breakdown