run-untrusted-code SKILL.md skillB
run-untrusted-code 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/run-untrusted-code@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/run-untrusted-code/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261109.2f1d005, committed Nov 9, 2026
- First version recorded
- Jun 13, 2026
- Size
- 1,752 bytes
- Repository stars
- 3
- License
- MIT
Run AI-generated or untrusted code safely in a disposable cloud VM instead of on the host, then delete it. Full root Ubuntu with zero blast radius on the user's machine; per-second billing means a throwaway run costs cents. Use whenever you'd execute code you don't fully trust.
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
# Run untrusted code (Box) Use this right before **executing code you generated or fetched** when running it locally would be risky: shell scripts, scraped snippets, dependency installs, anything with side effects. Pattern: **create → run → delete**, so nothing touches the host. ## Why Box - **Isolation** — a separate VM; the host filesystem and network are never exposed. - **Disposable & cheap** — `box delete` when done; $0.036/h billed per second, so a run costs cents of VM time. On the $20 plan, 200 starts a day are included; each extra start costs $0.03-$0.07. - **Real machine** — generated code that needs `pip install`, subprocesses, or Docker actually works. Prefer another tool for: thousands of tiny sub-second runs a day (E2B/Modal). ## Prereqs `curl -fsSL https://box.ascii.dev/install | sh`, then `box login "$BOX_API_KEY" --json`. ## Recipe ```bash box_id="$(box new --json | jq -r 'select(.event == "ready") | .id')" trap 'box delete "$box_id" --json' EXIT # never leak a VM box ssh "$box_id" -- "mkdir -p /run && cat > /run/main.sh" < ./main.sh box ssh "$box_id" -- "cd /run && timeout 120 bash main.sh" ``` …
Read the whole file at its exact version.
How to install
mdr add ariana-dot-dev/cloud-sandbox-vm-skills/run-untrusted-code@sha256:410221b51a2a8bffThe 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_nlytkpq3moqtqa54)
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 | 1,752 B | B | view · diff |
| git:20260613.95ab83b | 2026-06-13 | 95ab83b | 1,501 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 (1752 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_nlytkpq3moqtqa54 GET https://markdownregistry.com/api/v1/resolve?ref=ariana-dot-dev/cloud-sandbox-vm-skills/run-untrusted-code GET https://markdownregistry.com/api/v1/blob/410221b51a2a8bff4b6e81b200e957e7792e02ee670b3af8282840e082f5ea01
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.