Claude Extensibility

Q: What is a Claude Code skill and how does the Claude Extensibility 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. Claude Extensibility is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Dev Tools category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Dev Tools · Sub-category: cli-builders · Last updated: 2026-05-21

ai:claude type:cli

Claude Code extensibility: agents, skills, output styles. Capabilities: create/update/delete agents and skills, YAML frontmatter, system prompts, tool/model selection, resumable agents, CLI-defined agents. Actions: create, edit, delete, optimize, test extensions. Keywords: agent, skill, output-style, SKILL.md, subagent, Task tool, progressive disclosure. Use when: creating agents/skills, editing extensions, configuring tool access, choosing models, testing activation.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

CRUD operations for agents, skills, and output styles. This skill transfers expertise in building extensions that actually activate and deliver value.

What this skill does

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

When to invoke it: Use when: creating agents/skills, editing extensions, configuring tool access, choosing models, testing activation.

Who uses this skill

The Claude Extensibility Claude Code skill is built for developers, power users, and teams automating repetitive workflows and improving developer experience. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 168,000+ 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/claude-extensibility
curl -L https://claudskills.com/skills/claude-extensibility/SKILL.md \
  -o ~/.claude/skills/claude-extensibility/SKILL.md

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

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

📱 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 Claude Extensibility Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/claude-extensibility/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Claude Extensibility skill do?

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 Claude Extensibility skill?

Use Claude Extensibility when your Claude Code task falls under the Dev Tools category — specifically in the cli builders 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 Claude Extensibility" or describe the task and let Claude pick). Browse related skills at /category/tools/.

What is a Claude Code skill and how does the Claude Extensibility 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. Claude Extensibility is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Dev Tools 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). Claude Extensibility [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/claude-extensibility/

BibTeX

@misc{claude-extensibility-2026,
  author    = {ClaudSkills},
  title     = {Claude Extensibility [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/claude-extensibility/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/claude-extensibility.svg)](https://claudskills.com/skills/claude-extensibility/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-31 — 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 ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

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

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

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

Browse all Dev Tools 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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