GoKawiilRun Minecraft in a Windows sandbox
Boot a Windows sandbox, install Minecraft Java Edition, and drive it with an agent through the cua-driver MCP server running inside the sandbox.
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Minecraft exercises almost everything a Windows sandbox can do: it needs internet access, a Java runtime, working OpenGL, and a GUI that only clicks can drive. This guide boots a Windows sandbox, installs Minecraft Java Edition, and hands it to an agent that talks to cua-driver's MCP server inside the sandbox — the same loop against a local sandbox and against Fleet.
Before you start#
cua-sandbox 0.3.3 or newer. Windows on Fleet needs 0.3.0, Image.expose() on the local QEMU runtime landed in 0.3.1, the sb.exposed_ports this guide reads the forwarded port from landed in 0.3.2, and 0.3.3 brought both Image.from_registry(..., os_type=...) and the pull-secret fix that lets Fleet boot an image from a registry outside its own allowlist — which the containerDisk section below needs.
Windows on Fleet needs 0.3.0, on the local QEMU runtime landed in 0.3.1, the this guide reads the forwarded port from landed in 0.3.2, and 0.3.3 brought both and the pull-secret fix that lets Fleet boot an image from a registry outside its own allowlist — which the containerDisk section below needs. A host with hardware virtualisation for the local path — a Linux x86_64 machine with /dev/kvm , or an Intel Mac. This guide passes -cpu host , which QEMU only accepts with KVM or HVF. An x86_64 guest on Apple Silicon runs under TCG emulation, where -cpu host is rejected outright. The Fleet path runs there instead, including the game, with the one extra environment variable described in the Fleet section below.
for the local path — a Linux x86_64 machine with , or an Intel Mac. This guide passes , which QEMU only accepts with KVM or HVF. An x86_64 guest on Apple Silicon runs under TCG emulation, where is rejected outright. The Fleet path runs there instead, including the game, with the one extra environment variable described in the Fleet section below. A Microsoft account that owns Minecraft Java Edition. Signing in uses Microsoft device authorization, so one step in the middle is manual: a code appears inside the sandbox and you approve it in your own browser.
Signing in uses Microsoft device authorization, so one step in the middle is manual: a code appears inside the sandbox and you approve it in your own browser. A vision-capable LLM endpoint for the agent loop.
Boot a Windows sandbox#
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