AgentBox — an isolated VM per agent, alongside cmux

[madarco]

I've been running AgentBox alongside cmux and wanted to share the integration.

Repo: https://github.com/madarco/agentbox · Docs: https://agent-box.sh/docs · cmux integration: https://agent-box.sh/docs/integrations-cmux

The idea

cmux is great for running agents in parallel in the terminal. AgentBox adds an isolated VM per agent session: instead of agents sharing your machine, each one is teleported into its own sandbox — local Docker by default, or self-hosted / cloud (Hetzner, Daytona, Vercel, E2B, DigitalOcean).

npm -g install @madarco/agentbox
agentbox claude   # spins up a VM with Claude Code + your project inside

Works with Claude Code, Codex, and OpenCode (settings and workspace teleported in).

Why it complements cmux

• Sub-1s checkpoints — new boxes restore from a previous checkpoint almost instantly; idle boxes auto-pause to save cost.
• A full computer per box — dedicated browser, persistent shells, and a warmed-up VS Code / Cursor per sandbox.
• Credentials stay home — git credentials are kept on the host and pushes go through a permissioned relay, so agent code never sees your secrets.

So you can keep cmux as the cockpit for laying out and steering multiple agents, while each agent runs safely inside its own AgentBox VM. MIT-licensed.

Happy to answer questions or take feedback on the cmux integration.