book-to-skill: a Claude Code skill by Virgilio Junior

For readers who want a technical book's frameworks on hand as a skill Claude can consult. Skip it if a plain summary of the book would do.

Copy install command View the source

Score: 68of 100
Rank: #199of 239
Installs: 9.4Kon skills.sh
Stars: 37.5Kon GitHub
Security: Clear 3 scanners
Updated: Nov 82026
Context: ~111tokens always

Install

npx skills add https://github.com/virgiliojr94/book-to-skill --skill book-to-skill

Run it in your terminal. View the source

Most people install it straight from GitHub, where it has 37.5K stars, so its skills.sh count understates how widely it is used.

Using the Claude app rather than Claude Code? You can add a skill there too. How to add it in the app

What does book-to-skill do?

book-to-skill is a skill that turns a book or document (PDF, EPUB, DOCX, HTML, Markdown, text, RTF, or MOBI and AZW through Calibre) into a new agent skill you can consult while working. It runs a bundled extract.py, estimates cost, reads large books in slices, and drafts a report of the author's frameworks, principles, techniques and anti-patterns. After asking what the skill should help you do, it writes a SKILL.md with per-chapter summaries, a glossary, patterns and a cheatsheet into ~/.agents/skills, scans the result, and can fold new sources into an existing skill. Publishing to GitHub is optional and private by default.

When should you use book-to-skill?

Use it when

You want to apply a book's frameworks while coding
You want a searchable knowledge base from a long PDF
You are adding a second volume to an earlier skill

Skip it when

A one-page summary is all you need
You plan to share skills from copyrighted books publicly

What it needs and what it can touch

You need

Python 3
Calibre for MOBI and AZW files (optional)
The gh CLI to publish to GitHub (optional)

What it can do

Runs a bundled Python extraction script
Writes a skill folder under ~/.agents/skills and links it into ~/.claude/skills
Creates a GitHub repository only if you agree, private by default

From reading its instructions, not from running it.

Why it scores 68

Strongest on upkeep (100 of 100), weakest on adoption (41).

Adoption35 points 41
Upkeep20 points 100
Trust20 points 65
Quality15 points 90
Reader answers10 points Not enough answers yet, so this does not count

How the formula works

Is book-to-skill safe to install?

Every scanner that checked it passed it. Scanners often miss what other scanners catch, and a skill can change after a scan. Read its source before you install it.

Scanner	Result	Date
Gen Agent Trust Hub	Passed	Nov 4, 2026
Socket	Passed	Nov 4, 2026
Snyk	Low risk	Nov 4, 2026

Details

Installs: 9,377
Repository stars: 37,529
Last repository change: Nov 8, 2026
Tokens always loaded: about 111
Tokens when used: about 13,623
License: MIT
Data confidence: High

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