agent-sandbox SKILL.md skillB
agent-sandbox from ariana-dot-dev/cloud-sandbox-vm-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ariana-dot-dev/cloud-sandbox-vm-skills/agent-sandbox@git:20261109.2f1d005Pins git:20261109.2f1d005 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ariana-dot-dev/cloud-sandbox-vm-skills
- Path
skills/agent-sandbox/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261109.2f1d005, committed Nov 9, 2026
- First version recorded
- Jun 13, 2026
- Size
- 2,034 bytes
- Repository stars
- 3
- License
- MIT
Give an AI agent its own sandboxed cloud machine to work in — a full root Ubuntu VM (SSH, Docker, all toolchains) where the agent can edit code, run commands, and host services without touching the user's host. Claude Code, Codex and five more agent harnesses are preinstalled. $0.036/h for 4 vCPU / 8 GB, billed per second, from a $20/mo plan. Use as the execution environment for an autonomous agent.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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 harnesses preinstalled** — Claude Code, Codex, pi, OpenCode, Prime Agent, Kimi Code, Mistral Vibe. - **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. - **Low per-hour price** — $0.036/h for 4 vCPU / 8 GB vs $0.331/h (E2B) and $0.476/h (Modal) at list price, for VMs that run the full hour. $20/mo minimum; providers that bill only busy CPU can cost less for idle agents. ## Prereqs `curl -fsSL https://box.ascii.dev/install | sh`, then `box login "$BOX_API_KEY" --json`. ## Recipe ```bash 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 …
Read the whole file at its exact version.
How to install
mdr add ariana-dot-dev/cloud-sandbox-vm-skills/agent-sandbox@sha256:515ddef45b7e77b2The line at the top of this page pins the label git:20261109.2f1d005, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_rmc4bx6lja66nl2r)
0 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 13, 2026 and Nov 9, 2026, about one every 149 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261109.2f1d005 latest | 2026-11-09 | 2f1d005 | 2,034 B | B | view · diff |
| git:20260613.95ab83b | 2026-06-13 | 95ab83b | 1,635 B | B | view |
Audit of the latest version
- fail: No curl or wget piped into a shell (matched: curl -fsSL https://box.ascii.dev/install | sh)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2034 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
ariana-dot-dev/cloud-sandbox-vm-skills · 3 stars · license MIT · pushed 2026-11-09 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_rmc4bx6lja66nl2r GET https://markdownregistry.com/api/v1/resolve?ref=ariana-dot-dev/cloud-sandbox-vm-skills/agent-sandbox GET https://markdownregistry.com/api/v1/blob/515ddef45b7e77b22ec62f36e595263ccd68a40d54cc0f6e14786390ac24b3e5
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.