📚book-to-skill
Turn any technical book PDF into a Claude Code skill, ready to study, reference, and use while you work.
⭐ Very popular: 22k stars, gaining about 3k a week
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momentum
durability
bus factor = how many people it takes to cover more than half the commits (6 months). 1 is a solo project; higher means the work is spread across a team. top-author share is the single busiest author's slice of those commits.
since we covered it
why it's a big deal
- It compiles knowledge instead of retrieving it. One extraction pass distills a book into named frameworks and decision rules; the maintainer’s measured “discovery loop tax” puts it at 24-51x fewer tokens than dumping the book into context per question.
- It targets the open Skills spec as a compile target, so your library becomes portable infrastructure rather than vendor-locked embeddings - the clearest signal yet that the standard is real.
- It goes well beyond books: fold architecture decision records, runbooks, brand guidelines or a cluster of papers into a single skill and keep updating it as new material lands. Internal knowledge becomes an installable capability.
under the hood
- Pure-Python extraction with tiered parsers per format: pdftotext, pypdf or docling for PDFs (docling preserves tables and code blocks), ebooklib for EPUB, Calibre for MOBI; plain text and Markdown need no deps.
- Output is a roughly 4,000-token SKILL.md core plus 1,000-token chapters; converting a full book costs about a dollar of model spend at current Sonnet pricing.
- Ships its own measurement and validation tooling (discovery_tax.py, per-host skill validator); MIT-licensed converter that includes zero book content - you bring your own copy.
our take from PR#39, 2026-07-30
star history
- PR#39 13k 2026-07-30
- now 22k + 9k since first covered
curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.
understory
Better known than its recent output, coasting a little on attention.
- output, commits & releases
- clout, star velocity
output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →
covered in
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compile a book into an agent skill
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