Turn a Book into an AI Skill and Sell It for Profit: A Step-by-Step Open-Source Guide

Let's start with something practical: every book you've read on your shelf could be an AI skill you sell on Xianyu or Xiaohongshu. I'll use Claude Opus 4.8 to demonstrate step-by-step how to turn a book into a skill you can call upon anytime. It sells for 19.9 on Xianyu and can go for 99-199 on Xiaohongshu. I'm giving you the entire method + prompts + open-source skill—even beginners can copy it. I'll also share thoughts on monetization at the end.

Table of Contents

• 1. Your Biggest Waste
• 2. The Real Difficulty
• 3. Preparation (5 Minutes, One-Time Setup)
• 4. Six Steps to Turn a Book into a Skill (Copy the Prompts)
• 5. Case Study: Turning "Nonviolent Communication" into a Skill
• 6. How to Monetize This Skill
• 7. Final Thoughts

1. Your Biggest Waste

During my time as an AI blogger, I've read many books and methodologies, but I've slowly realized a painful truth—

Reading it doesn't mean you can use it.

I'm sure you've experienced this: you're excited while reading, highlighting everything and taking notes in Notion, but three months later, when you need to write something or make a decision, your mind is blank. It's as if you never read the book.

Simply put, most people's reading is just hoarding; they aren't actually calling upon that knowledge.

So, can we let AI turn the methodology in a book into a tool we can call up anytime?

Over the weekend, I tinkered with an open-source skill—extracting any book into a skill that AI can invoke. It's not a book review or a summary; it's a truly practical toolbox: the frameworks, principles, techniques, and anti-patterns from the book are all turned into instructions the AI can execute.

2. The Real Difficulty

The real difficulty isn't extracting the content; it's making sure the AI reads everything.

A book has tens of thousands of words. You need the AI to digest the entire logical chain at once, rather than reading it in fragmented pieces.

Once the logic is fragmented, the cause-and-effect across chapters is broken, and the extracted framework becomes incomplete.

That's why you must use the top-tier AI models. I used Claude Opus 4.8.

Three of its capabilities are perfect for this task:

• Long Context: A 1-million token context window allows it to read the whole book at once without losing logic.
• Structured Output: It spits out clean skill files without needing manual formatting.
• Multi-step Agentic Behavior: After generating, it can self-check and perform test calls to fill in any gaps.

I use ZenMux to access Opus 4.8. Since my official Claude account was banned a few times, I switched—you can access over 200 models via one API without a VPN. You can subscribe for heavy use or pay-as-you-go.

It's very suitable for tasks like this that require feeding entire books and comparing different models.

3. Preparation (5 Minutes, One-Time Setup)

The configuration looks technical, but it's just a few steps you only do once:

① Generate your API Key in the ZenMux backend. Look for "Subscription API Key," click generate, and copy the sk-ss-v1-... key. Keep it private.

② Choose a billing method.

• Subscription (Builder Plan) -> Predictable usage, fixed monthly fee.
• Pay As You Go -> Best for occasional or unstable usage.

③ Open Cursor, go to Settings → Models, and do three things:

First, toggle on "Override OpenAI Base URL" and enter:

https://zenmux.ai/api/v1

Second, enter your ZenMux key in the "OpenAI API Key" field.

Third, leave the "Anthropic API Key" field blank. This is crucial—if you fill it, Cursor will try to route claude- models to Anthropic directly instead of ZenMux, causing an error.

④ Click "+ Add model" and enter this name:

anthropic/claude-opus-4.8

Note: It must have the anthropic/ prefix.

⑤ Start a new chat, select this model, and send "Are you there?" If it replies, you're connected.

4. Six Steps to Turn a Book into a Skill

Goal: Get a clean text (.txt or .md) version of the book. Formatting doesn't matter as long as the logic is there.

Choose one of three methods:

Option A · Already a Word/Web article Save Word as "Plain Text (.txt)"; for web articles, copy and paste into Notepad.

Option B · PDF or EPUB (Recommended for beginners) Use Calibre (free at calibre-ebook.com):

1. Install and drag the ebook in.
2. Click "Convert books."
3. Set output format to TXT and click OK.
4. Find the .txt file in the folder.

I've made the mistake for you—many "free" online converters try to trick you into subscriptions. Calibre is much more stable.

Option C · No installation Search for "epub to txt online," but be careful with copyright and privacy.

⚠️ Key: You need the clean, full text. Don't let a tool summarize it first, or you'll lose the framework's precision.

Upload the .txt or paste the text in sections. Use this prompt:

1This is the full text of [Book Name]. Do not summarize yet.
2Read the whole book and give me a global structure map:
3What is the core argument? What frameworks/principles/techniques/anti-patterns surround it? What is the logical relationship between them?
4What is the author's distinctive tone?
5I want to use it to create a skill that helps me [Your Purpose, e.g., make decisions during an economic downturn].

Next prompt:

1Extract the book into these 5 categories: Frameworks / Principles / Techniques / Anti-patterns / Author's Voice.
2For each entry, provide: Name + One-sentence definition + When to use + Exact phrasing from the book.
3Keep the author's original naming for frameworks. 
4Which are core and which are secondary? Give me a table.

If the book has few frameworks (1-3), make one file. If many (10+), use an entry file with lazy loading.

Prompt:

1Generate a Cursor skill based on this table.
2Focus on the description at the beginning—
3Include the scenarios and phrases a user would use when they need this,
4as this determines if the AI will automatically trigger it.

Don't skip this. Ask the AI to verify two things:

① Recall Test
``text
Looking only at the description of this skill,
would you trigger it if a user said these 5 phrases? Judge each one.
``

② Execution Test

Use the skill to solve a real problem the book addresses and see if the steps are actionable or just fluff.

Feed the same data to Opus 4.8 and another model to see which extracts better. ZenMux makes this easy by switching models with one API.

5. Case Study: "Nonviolent Communication"

I chose Marshall Rosenberg's "Nonviolent Communication" because its framework is very clear. Clearer frameworks make for better tests.

Total Time: About 45 minutes for the first time (including setup). Once familiar, it takes under 20 minutes per book.

Actual Cost: Using ZenMux, the whole process for one book (about 300k tokens) cost less than 20 RMB.

The Result: Opus 4.8 preserved original terms like "OFNR" (Observation, Feeling, Need, Request) and the "Giraffe vs. Jackal" metaphors. It turned "speak nicely" into a concrete four-step process I can actually follow.

The self-check caught an issue: The first version's triggers were too narrow. I had to add everyday phrases like "how to give feedback without sounding like I'm blaming" for it to trigger correctly.

The 'Aha' Moment: I had something difficult to say to a family member. I called the skill, and it rearranged my thoughts into the OFNR format, removing accusatory language. A book I read years ago was finally helping me work, rather than gathering dust.

6. How to Monetize This

• Target Audience: People who want the methodology but are too lazy to do this themselves, or beginners wanting to learn AI skills.
• Platforms & Pricing:
• Xianyu: Volume sales at 19.9–29.9 RMB. Title: "[Book Name] AI Skill + Installation Tutorial."
• Xiaohongshu: Use images for traffic, close deals in private messages for 99–199 RMB.
• What to sell: The skill file + installation guide. You can also offer custom services.
• Red Line: Sell your extracted skill and service, not the pirated full text of the book.

7. Final Thoughts

This process changed how I view reading. I no longer measure how many books I've read, but how many books I've turned into AI-callable capabilities. The greatest waste of knowledge isn't not reading; it's reading and letting it sit in a folder.

I've open-sourced the skill here: https://github.com/ayi-ai/ayi-nonviolent-communication

Try it out and let me know which book you turn into a skill!