Turn Any Book Into an Agent Skill
book-to-skill is climbing GitHub trending fast, north of 11,000 stars. What it does is dead simple to describe and quietly clever: hand it a technical book, a PDF, or a pile of docs, and it compiles them into a real Agent Skill. Chapters, glossary, cheatsheets, all loaded on demand as slash commands instead of sitting in your context window.
The number that's making it spread is 24 to 51 times fewer tokens than dumping the whole book into context. Instead of carrying a 400-page PDF around on every turn, the agent pulls only the chapter it actually needs. It follows the open Agent Skills standard, so the same SKILL.md works across Claude Code, GitHub Copilot CLI, and Amp without changes.
This is the skills-economy thesis shrunk to something you can run tonight. Knowledge stops being context you paste and becomes a package you install. Every reference book on your shelf is now a potential capability you snap onto an agent, and the token math means it's not just tidier, it's cheaper and less prone to hallucination because the model retrieves instead of guessing. Repo is github.com/virgiliojr94/book-to-skill.
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The number that's making it spread is 24 to 51 times fewer tokens than dumping the whole book into context. Instead of carrying a 400-page PDF around on every turn, the agent pulls only the chapter it actually needs. It follows the open Agent Skills standard, so the same SKILL.md works across Claude Code, GitHub Copilot CLI, and Amp without changes.
This is the skills-economy thesis shrunk to something you can run tonight. Knowledge stops being context you paste and becomes a package you install. Every reference book on your shelf is now a potential capability you snap onto an agent, and the token math means it's not just tidier, it's cheaper and less prone to hallucination because the model retrieves instead of guessing. Repo is github.com/virgiliojr94/book-to-skill.
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