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21

Category: General  ·  Sub-category: general-misc  ·  Last updated:
2026년 4월, 상하이의 한 24세 엔지니어가 퇴근 후 네 시간을 써서 만든 GitHub 저장소 하나가 중국 테크 업계의 심장을 찔렀다. 그것이 겨눈 것은 코드가 아니라 동료의 **영혼**이었다. 회사가 직원에게 "너 자신의 대체품을 설계하라"고 요구하는 시대, 개발자들은 어떻게 반격하고 있는가 — 그리고 그 반격조차 증류될 운명인가?
Security AStatic scan found no risk patternsHow grading works ›

What this skill does

21 is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/21/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The 21 Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 146,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/21
curl -L https://claudskills.com/skills/21/SKILL.md \
  -o ~/.claude/skills/21/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/21/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/21/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\21\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

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 →

Pro

One-click install via the desktop app

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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the 21 Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/21/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the 21 skill do?
2026년 4월, 상하이의 한 24세 엔지니어가 퇴근 후 네 시간을 써서 만든 GitHub 저장소 하나가 중국 테크 업계의 심장을 찔렀다. 그것이 겨눈 것은 코드가 아니라 동료의 **영혼**이었다. 회사가 직원에게 "너 자신의 대체품을 설계하라"고 요구하는 시대, 개발자들은 어떻게 반격하고 있는가 — 그리고 그 반격조차 증류될 운명인가?
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the 21 skill?
Use 21 when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use 21" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the 21 skill fit in?
A Claude Code skill is a 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. 21 is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). 21 [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/21/
BibTeX
@misc{21-2026,
  author    = {ClaudSkills},
  title     = {21 [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/21/}
}

Embed this skill

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Badge
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<script>
<script src="https://claudskills.com/embed/21.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/21.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: 21"></iframe>

Security scan

Grade A · scanned 2026-07-06 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/21/#security)

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More General skills

Browse all General skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all General skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

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