AgentBox is an SDK for running coding agents (Claude Code, Codex, OpenCode) inside sandboxes (Docker, E2B, Modal, Daytona, Vercel). One API. Swap the agent or the sandbox and your code doesn't change.
Think of it as what the AI SDK did for LLMs, but for agent + runtime.
Most wrappers call agents in non interactive mode (claude --print, codex exec). AgentBox instead boots each agent's native server inside the sandbox (Codex app-server over JSON-RPC, OpenCode serve over HTTP/SSE, Claude Code's SDK WebSocket transport) and drives it from the host, behaving like an interactive session.
Live demo: https://agentbox-demo-175164121374.us-west1.run.app
Feedback welcome, especially on the abstractions and which providers to add next!