- About this book
- How to read this book
- 53 recommended skills
- Getting started with Claude Code and Codex
- What is an agent and where do skills fit
- What are agent skills
- Claude Code skills
- Codex skills
- Spec differences
- One folder for both tools
- Glossary
- Part 01 Business (7 skills)
- Part 02 Marketing (7 skills)
- Part 03 Data analysis (5 skills)
- Part 04 Design (7 skills)
- Part 05 Development (6 skills)
- Part 06 Operations (7 skills)
- Part 07 Working with agents (8 skills)
- Part 08 Vibe coding (6 skills)
The Claude Code & Codex Skills Guidebook
53 agent skills tested in both tools
This book is 100% completeLast updated on 2026-10-08
Skip the trial and error. 53 agent skills picked and run in Claude Code and Codex, each with who it fits, install commands, and a first run.
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About
About the Book
There are thousands of agent skills on GitHub, and most come with a short README written for developers. Finding out whether one fits your work means installing it, running it, and cleaning up when it does not.
This guidebook does that sorting for you. It picks 53 skills worth your time across business, marketing, data analysis, design, development, operations, agent workflows, and vibe coding, and runs each one in both Claude Code and Codex.
Every skill chapter gives you the same five things, in the same order:
- Who it fits: situations rated good, okay, or poor fit, with a reason for each
- Install: the commands for Claude Code and for Codex
- First run: what to type and what the skill does step by step
- What makes it useful, and what to watch out for
- Sources: repository, license, and the files quoted
Foundation chapters explain agents, skills, subagents, MCP, and hooks in plain language, show how the two tools read the same SKILL.md, and walk you through sharing one skill folder between them. A roadmap by role (planning, design, development, marketing, operations, research) tells you which skills to read first.
Who it is for: developers, indie hackers, and solo founders who use Claude Code or Codex and want to stop writing the same instructions every session.
About 280 pages. Reference versions: Claude Code v2.1.273 and Codex v0.153.4. This is the English edition of a guidebook first published in Korean in September 2026.
PDF and EPUB. Pay what you want from $19 (suggested $29). You get every future edition free: both tools change fast, and the book is revised as they do. Leanpub refunds 100% within 60 days.
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About the Author
Jay Jung Lim
Jay Jung Lim is the founder of BuildnWrite and an AI agent coach. Since 2023 Jay has run corporate AI training for more than 20 organizations, coauthored "n8n Does It All" (Hanbit Media, 2026), and taught more than 1,000 learners (as of July 2026). Jay uses 70 skills in daily work and logged more than 6,000 Claude sessions and 1,000 Codex sessions while building this book.
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Table of Contents
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