sandbox-lifecycle SKILL.md skillA
sandbox-lifecycle from arbiterforge/codearbiter is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add arbiterforge/codearbiter/sandbox-lifecycle@git:20260725.d4b3388Pins git:20260725.d4b3388 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- arbiterforge/codearbiter
- Path
plugins/ca-sandbox/skills/sandbox-lifecycle/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260725.d4b3388, committed Jul 25, 2026
- First version recorded
- Jun 20, 2026
- Size
- 10,484 bytes
- Repository stars
- 152
- License
- AGPL-3.0
The lifecycle gate for a local Codespace-equivalent sandbox. Routed to when the user invokes /ca-sandbox:sandbox to pull an untrusted repo into an ephemeral, host-FS-isolated Docker container, or any of the interaction commands (/ca-sandbox:sandbox-shell, /ca-sandbox:sandbox-exec, /ca-sandbox:sandbox-cp, /ca-sandbox:sandbox-destroy) against an existing box. Five gated phases — pre-flight, clone+build, isolated run, interact, teardown. The load-bearing invariant is structural: untrusted code in…
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
# sandbox-lifecycle
Pull an untrusted repo into a throwaway box, explore it without risking the host, then burn the box. This skill owns the whole arc — clone into a named volume, build a dep-cached image, run it under structural isolation, interact (shell / exec / cp out), destroy — and the one invariant that makes it safe: **the code inside the box can never touch the host filesystem.** That guarantee is enforced by construction (no bind mounts, no docker socket, never `--privileged`), not by trusting the repo.
The driver lives in `${CLAUDE_PLUGIN_ROOT}/tools`. The skill never hand-rolls a `docker run` argv — every container is started through `runContainer` in `${CLAUDE_PLUGIN_ROOT}/tools/run.ts`, whose mount argv comes only from `buildMountArgs` in `${CLAUDE_PLUGIN_ROOT}/tools/mounts.ts` (the chokepoint that throws on any bind spec).
## Pre-flight
Read these, or STOP and surface the gap — never guess a Docker capability, a mount layout, or an egress posture:
- `${CLAUDE_PLUGIN_ROOT}/tools/mounts.ts` — the mount-arg chokepoint. Every mount is built here; it throws (`BindMountRejectedError`) on any `type=bind` spec. The structural half of the host-FS invariant.
…Read the whole file at its exact version.
How to install
mdr add arbiterforge/codearbiter/sandbox-lifecycle@sha256:e8c179e57fd14188The line at the top of this page pins the label git:20260725.d4b3388, 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_xxjz5ozbpxvatwzk)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 20, 2026 and Jul 25, 2026, about one every 34 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260725.d4b3388 latest | 2026-07-25 | d4b3388 | 10,484 B | A | view · diff |
| git:20260620.6a1de36 | 2026-06-20 | 6a1de36 | 9,683 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10484 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 curl or wget piped into a shell
- 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
Source
arbiterforge/codearbiter · 152 stars · license AGPL-3.0 · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xxjz5ozbpxvatwzk GET https://markdownregistry.com/api/v1/resolve?ref=arbiterforge/codearbiter/sandbox-lifecycle GET https://markdownregistry.com/api/v1/blob/e8c179e57fd141885abdda2045b46e25c9423d29e3ff05e54e613b5d57e1cb2b
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.