A Skill is a folder with a Markdown file SKILL.md inside: instructions that Claude Code runs when you call /name.

In depth: 07 · Skills: modular capabilities → “What is a Skill”

Related: Hook / Hooks · plugin · agent

Appears in

• 00 · Kickstart: First steps · The Source or the Packaging
• 01 · Introduction: Your first prompt
• 03 · Stack selection: What are your constraints? · Migration plan for your workflow
• 04 · Prompt Engineering: The spec formula · A professional prompt
• 06 · Automation Pipeline: A pipeline that runs on its own
• 07 · Tools & Extensions: What's Claude Code missing? · Plug it in and test · Pendel: your agent audits your project
• 08 · Agent Engineering: Agent SDK: the Agent as a Library
• 09 · AI Notebook: Where it lies
• 10 · Model Training: Fine-tuning: when and how · Evaluation: did it help
• 11 · Second Brain: Skills travel from agent to agent · Security: everything that comes from outside · Practice: build your own second brain

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checked against the course: 2026-11-02 · 664b147