Your technical books are dying as forgotten PDFs. book-to-skill is an open-source CLI that fixes that: feed it a PDF or EPUB, and it spits out a structured knowledge base your coding agent can actually query. It gained 1,428 stars in a single day, 12.6k total, because it hits a raw nerve in the coding-agent world — context engineering and token cost.
How it works
Four steps. It picks a parser by document type (Docling for technical books, pdftotext for prose), lets Claude read the chapter structure, generates per-chapter summaries, glossaries, design patterns, and decision tables, then assembles one core SKILL.md plus chapter files loaded on demand.
That on-demand loading is the whole trick. Instead of stuffing an entire book into context, the agent pulls only the chapter it needs — 24 to 51x fewer tokens.
Why it matters
It outputs standard Agent Skills files, so the same book works in Claude Code, GitHub Copilot CLI, and Amp — no lock-in. You stop pasting chapters into chat and start typing /your-book-slug to ask a question. The AI reads the real chapter and answers from the source, not from a hallucinated memory of it.
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