sandbox-lifecycle

82 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By arbiterForge/codeArbiter (GitHub) · coding · 153 stars · scanned at commit 3f1bd13

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 …

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

This is disclosed by the author in the skill's SKILL.md or README. Expected for a coding skill.

Found in 7 places.

plugins/ca-sandbox/tools/build.ts, line 43import { spawn, type SpawnOptionsWithoutStdio } from "node:child_process";
plugins/ca-sandbox/tools/create.ts, line 39import { spawnSync, spawn } from "node:child_process";
plugins/ca-sandbox/tools/create.ts, line 138* - git's transport-helper syntax (`ext::sh -c <cmd>`, `fd::`, `file://`) runs

Show 4 more

plugins/ca-sandbox/tools/create.ts, line 313const createResult = spawnSync("docker", buildCpHelperCreateArgs(volumeName, helper, id), {
plugins/ca-sandbox/tools/create.ts, line 326const cpResult = spawnSync("docker", ["cp", `${helper}:${APP_DIR}/.`, dir], {
plugins/ca-sandbox/tools/create.ts, line 341spawnSync("docker", ["rm", "-f", helper], { env: DOCKER_ENV });
plugins/ca-sandbox/tools/docker.ts, line 19import { spawn, type SpawnOptions } from "node:child_process";

Downloads and installs other software

The author does not mention this.

Found in 3 places.

plugins/ca-sandbox/tools/build.ts, line 377* - requirements.txt -> pip install --target=/deps/site-packages, ENV PYTHONPATH
plugins/ca-sandbox/tools/build.ts, line 400lines.push(`RUN apt-get update && apt-get install -y --no-install-recommends python3 python3-pip && rm -rf /var/lib/apt/lists/*`);
plugins/ca-sandbox/tools/build.ts, line 402lines.push(`RUN pip3 install --no-cache-dir --target=${DEPS_DIR}/site-packages -r /tmp/requirements.txt`);

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'sandbox-lifecycle' ] || [ -L ~/.agents/skills/'sandbox-lifecycle' ]; then echo 'A skill folder named sandbox-lifecycle already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/arbiterForge/codeArbiter' "$d" && git -C "$d" checkout --quiet '3f1bd13762ed9f25320e58907f9bf98a81128504' -- 'plugins/ca-sandbox/skills/sandbox-lifecycle' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/ca-sandbox/skills/sandbox-lifecycle' ~/.agents/skills/'sandbox-lifecycle' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'sandbox-lifecycle' ~/.claude/skills/'sandbox-lifecycle' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-13	`3f1bd13`	82
2026-11-09	`fd7eb34`	82
2026-11-07	`94d9018`	82