Scott Hanselman's sandbox-mcp gives agents a throwaway Windows 11 VM to test apps
The MIT-licensed sbx CLI, with an optional MCP adapter, wraps Windows Sandbox so an agent can boot a clean, network-off Windows 11, deploy an app, drive the UI, keep crash evidence, and discard the machine. A GUI test run takes roughly 40–50 seconds boot to teardown, and it needs Windows 11 with Sandbox support (digest).