Microsoft shipped a cage for AI agents that they cannot unlock.
Microsoft released Execution Containers, a containment layer for AI agents, to all Windows 11 developers on 7 October. Developers list the files and sites an agent may touch, and the agent cannot widen that list. GitHub Copilot and OpenAI's Codex already use it, and Microsoft says Claude Code will follow.
Why it mattersAn agent on your PC can read and delete whatever you can. A fence it cannot move limits the damage when it goes wrong.
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