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Claude Code is pre-installed on every boxd machine. Launch it from any directory: 
ssh myapp.boxd.sh
cd my-project
claude
Use it with a Claude subscription (e.g., Claude Max) or by setting an API key.

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Persistent auth

When you authenticate Claude Code on a boxd machine, your credentials are saved to your boxd account. If your machine is reset, destroyed, or you create a new one, Claude Code is already authenticated — no need to sign in again. This happens automatically. There’s nothing to configure.

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AGENTS.md

Every machine includes an CLAUDE.md that gives Claude Code context about the boxd environment — how to create machines, manage proxies, and use the boxd CLI from inside a VM. It’s picked up by default. This means Claude Code can help you manage your boxd infrastructure directly from conversation.

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Codex

Codex is also pre-installed on every machine. It gets an AGENTS.md file with similar context. Authentication is not yet automated for Codex, so you’ll need to login on every new machine.