Open-source Claude Code plugin captures books and converts them to structured Markdown
What it does
book-capture is a Claude Code plugin that converts books into structured Markdown files. You open a book on your Mac, run a command, and it automatically processes the content through a multi-step pipeline.
Technical implementation
The tool captures book content using several methods:
- Screenshots every page automatically using macOS screencapture + CGWindowList via Swift
- Runs OCR with macOS Vision framework
- Pages that Vision can't read well (especially vertical Japanese text) get re-read by Claude Code agents via multimodal image reading
- Analyzes the full text and generates structured Markdown files organized by theme — not by chapter order
Output format
The plugin creates multiple topic files (500+ lines each) containing:
- Tables
- Blockquotes
- Cross-references
- A hub file with wikilinks
The output is standard Markdown, built for Obsidian but compatible with any Markdown editor.
Key implementation details
- No external API keys — all AI work runs through Claude Code agents
- Theme count scales with book size (4-6 for a short book, up to 25 for 500+ pages)
- Parallel agents generate topic files simultaneously
- End-of-book detection via perceptual image hashing (3 consecutive identical pages = done)
- Supports Mac Kindle, Apple Books, Kindle Cloud Reader (Playwright), and scanned PDFs (Poppler)
Requirements and setup
The tool requires macOS. The OCR uses a Swift CLI that compiles on first run. The source is available on GitHub at https://github.com/masterleopold/book-capture.
📖 Read the full source: r/ClaudeAI
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