No. The four cover different parts, so you can read whichever sits closest to your current problem. If review has stalled, the third one is enough. If answer accuracy is the problem, the fourth stands on its own.

If I only buy one, which one?

If you use Claude Code every day, Harness Engineering. If you have not started yet, Practical Claude Code. The first is the concept, the second is the procedure.

Should I buy the English edition or the Japanese one?

The content is the same, so one of them is enough. The English edition is on amazon.com, the Japanese on amazon.co.jp, and the Portuguese on amazon.com.br. There is no reason to buy two.

Do the four books overlap?

The first three build on each other without repeating: the first is procedure, the second is the reasoning underneath it, the third applies that reasoning to code review. The fourth sits on a separate axis (context and accuracy) and shares almost nothing with the other three.

All books

There are now four books on Harness Engineering.

AI Coding in Practice
4 books
All available on Kindle

4 books together get you

Decide how far to delegate to an AI agent by design, not by feel
Write CLAUDE.md and AGENTS.md in a form the rest of the team can keep up
Split review into three layers (hooks, AI, people) and decide what to automate
Pick between RAG and MCP by looking at benchmark numbers

Reading order

1

runningPractical Claude Code

Once it runs on your machine, the theory in the next book has something to attach to
2

architectureHarness Engineering

The loose techniques from the first book turn into a system here
3

reviewSystematizing AI Code Review

Applies the architecture to the step that eats the most time, so the effect shows up first
4

precisionTurning LLMs from Liars into Experts

A separate axis from the other three. You can leave it until accuracy is the problem you actually have

If you already use Claude Code every day, start with the second book, Harness Engineering. If you have not started, the first one covers that. Technical books stand on their own, so treat this order as where to enter rather than a prerequisite.

What each book covers

running

Practical Claude Code

Context Engineering for Modern Development

For whom: Anyone starting with Claude Code, or already started and stuck
What it solves: What goes in CLAUDE.md, where Plan Mode earns its keep, and what breaks once you hand the setup to a team
Length: 19 chapters / $9.99

View on Kindle Contents and details

architecture

Harness Engineering

From Using AI to Controlling AI

For whom: People who can make it work but cannot explain why it works
What it solves: What a harness actually is, read across five sources (OpenAI, Anthropic, LangChain, Martin Fowler, academia) and broken into six components
Length: 14 chapters / $9.99

View on Kindle Contents and details

review

Systematizing AI Code Review

The 3-Layer Model for 60% Faster Reviews

For whom: Teams where review has stalled, or where review was handed to AI and got noisy
What it solves: What belongs in each of the three layers. CodeRabbit and GitHub Actions configuration, and how Conventional Comments hold up in practice
Length: 15 chapters / $9.99

View on Kindle Contents and details

precision

Turning LLMs from Liars into Experts

Context Engineering in Practice

For whom: Anyone who does not trust the answers, or who added RAG and cannot tell whether it helped
What it solves: RAG, MCP, Memory and Agentic RAG sorted by stage, with benchmarks for what each stage changes
Length: 15 chapters / $4.99

View on Kindle Contents and details

About the other editions

These four books also exist in Japanese and Portuguese. The content is the same as the English edition, so there is no reason to buy the same book twice.

Buy the set

On Amazon this series is listed as “AI Coding in Practice”. The order above is the volume order.

Books are sold individually for now. The Amazon series bundle is pending approval; the link will appear here once it is live.

FAQ

Do I need all four?: No. The four cover different parts, so you can read whichever sits closest to your current problem. If review has stalled, the third one is enough. If answer accuracy is the problem, the fourth stands on its own.
If I only buy one, which one?: If you use Claude Code every day, Harness Engineering. If you have not started yet, Practical Claude Code. The first is the concept, the second is the procedure.
Should I buy the English edition or the Japanese one?: The content is the same, so one of them is enough. The English edition is on amazon.com, the Japanese on amazon.co.jp, and the Portuguese on amazon.com.br. There is no reason to buy two.
Do the four books overlap?: The first three build on each other without repeating: the first is procedure, the second is the reasoning underneath it, the third applies that reasoning to code review. The fourth sits on a separate axis (context and accuracy) and shares almost nothing with the other three.