Wire a CLI into the toolbox image. The work is mechanical but spread across four files (five when the tool persists state), and a gap in any one silently regresses something — Renovate stops bumping the version, a catalog bijection test fails the build, smoke-test blesses a broken binary, or <tool> auth login writes to a tmpfs that vanishes on toolbox stop. Apply every edit yourself and finish on the gate; a checklist handed back to the user is not the deliverable.
Add CLI is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/add-cli/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when the user wants a binary available inside `toolbox shell`, or when an already-installed CLI's credentials don't survive a container recreate.
The Add CLI Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 183,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/add-cli curl -L https://claudskills.com/skills/add-cli/SKILL.md \ -o ~/.claude/skills/add-cli/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/add-cli/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/add-cli/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\add-cli\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/add-cli/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Add CLI is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{add-cli-2026,
author = {filippolmt},
title = {Add CLI [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/add-cli/}
}Grade B · scanned 2026-08-11 — free static scan against the OWASP Agentic Skills Top 10.
The scan flagged 2 of 10 categories (filesystem, supply-chain), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.
Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.