Book 4 in The Claude Builder's Library
Claude Code Skills
Build reusable SKILL.md Skills that make Claude an expert at your exact work, automate every repeated workflow, and run anywhere from Codex to Cursor to Gemini CLI.
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What is inside
Every Skill in the book as working files, the tools to test them, and the ten Skills that did not fit on paper. Free updates whenever the SKILL.md format changes.
- 20Blueprint SkillsEvery Skill from Part Six as an installable folder with its own test set.
- 10Bonus SkillsNot in the book: audit any Skill, turn a session into a Skill, tour a codebase, triage logs, and more.
- 6ToolsA Skill linter, a frontmatter validator, a security scan, and an isolation script.
- 1The Skill ForgeBuild your own Skill in the browser, question by question, with live checks.
- 20+Templates and checklistsEvery skeleton, checklist, flowchart and test set template from the book.
- 5Practice repositoryA real git repository with planted bugs, plus Skills that fail on purpose.
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