Book-to-skill: Compile a 400-page technical book into skills that the Agent loads on demand

You bought a copy of "Designing Data-Intensive Applications" and read it for three months, underlining and taking notes, thinking you finally understood it. Half a year later, when you write code and encounter the problem of copy delay, you vaguely remember it in Chapter 5 of the book, but you have completely forgotten what was said and what terminology was used. Open the PDF and search for replication, returning 47 results spread over 23 pages. Lose the entire book to Claude? A 400-page book costs about 200,000 tokens, and the full text will be burned every time a question is asked, and the model's retrieval accuracy for the middle part of the long context will also decrease. This is what virgiliojr94’s book-to-skill is for