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blackwall

69 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a coding skill usually runs build and test commands.

By vinta/hal-9000 (GitHub) · coding · 143 stars · scanned at commit ada6eb5

Run, configure, and debug blackwall, the sandbox for claude, codex, and other dev commands (srt: Seatbelt on macOS, bubblewrap on Linux). Use when the user asks whether this session is sandboxed or what it can read, write, or reach, mentions blackwall, wants a command run sandboxed, or wants the sandbox to reach a path, host, or tool: ~/.blackwall/config.json, .blackwall/config.json, presets, --add-dir, --trust; or wants a blackwall bug report. Also use inside a sandboxed session when a command…

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

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

if [ -e ~/.agents/skills/'blackwall' ] || [ -L ~/.agents/skills/'blackwall' ]; then echo 'A skill folder named blackwall already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/vinta/hal-9000' "$d" && git -C "$d" checkout --quiet 'ada6eb5ed0de3020027c7a59e5d0aeb76889528d' -- 'plugins/evals/hal-skills/best-practices/sandbox-run-skill/fixture-plugin/skills/blackwall' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/evals/hal-skills/best-practices/sandbox-run-skill/fixture-plugin/skills/blackwall' ~/.agents/skills/'blackwall' && 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/'blackwall' ~/.claude/skills/'blackwall' (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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