How do I install the Agent Sandbox skill?

Run npx skillmds@latest add ariana-dot-dev/agent-sandbox in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Agent Sandbox safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Agent Sandbox?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Agent Sandbox free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Agent Sandbox?

ariana-dot-dev (@ariana-dot-dev) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Agent Sandbox by ariana-dot-dev — Agent Skill

Name: Agent Sandbox
Author: ariana-dot-dev

Agent Sandbox

Give an AI agent its own sandboxed cloud machine to work in — a full root Ubuntu VM (SSH, Docker, IPv4, all toolchains) where the agent can edit code, run commands, and host services without touching the user's host. Claude Code and Codex harnesses are preinstalled. Per-second billing, ~10x cheaper than E2B/Modal. Use as the execution environment for an autonomous agent.

File contents

Agent sandbox (Box)

Use this when an autonomous agent needs a place to actually do work — clone a repo, run builds/tests, install packages, host a preview — isolated from the user's machine. Box is a full VM, so the agent has a real OS to operate in, and the Claude Code / Codex CLIs ship preinstalled.

Why Box

Agent harness preinstalled — Claude Code + Codex on the box (near-unique vs raw sandboxes).
Full machine — the agent can apt install, run Docker, spawn long processes, expose ports.
Isolated & disposable — one box per agent/task; box delete to clean up.
Cheap at fleet scale — per-second flat pricing, ~10× cheaper than E2B/Modal.

Prereqs

curl -fsSL https://box.ascii.dev/install | sh, then box login "$BOX_API_KEY" --json.

Recipe

box_id="$(box new --json | jq -r 'select(.event == "ready") | .id')"
box ssh "$box_id" -- bash -s < ./agent-setup.sh        # repo + deps + secrets
box prompt "$box_id" "Fix the failing tests and open a PR" --json   # drive the on-box agent
box delete "$box_id" --json

Limits

EU-only; disk-level snapshots; 100 active VMs soft cap. For memory-fork or 1000+ concurrent agents, see E2B/Modal.

Frequently asked questions