PaperbackKit Connector (MCP)
PaperbackKit is a remote MCP server that prepares books for publishing, inside your AI assistant: audit a Word manuscript against Amazon KDP's formatting rules, typeset a print-ready interior preview, run EPUB / PDF / Word accessibility audits (EAA, Section 508, WCAG), preflight cover and interior PDFs, and calculate spine and cover dimensions.
Connect
- Server URL:
https://paperbackkit.com/api/mcp(Streamable HTTP, stateless) - Authentication: none. Every audit, preflight, calculator and preview tool works without an account. The only tool that takes a credential is
fix_epub_accessibility, which asks existing Fix My EPUB customers for the license key from their receipt email. - In Claude: Settings → Connectors → Add custom connector → paste the server URL.
- In ChatGPT:enable Developer mode, create a connector with the same URL (no authentication), then select the app from the composer's “+” menu.
Tools
All tools are read-only: they analyze or typeset the file you attach and return a report or preview. Nothing is modified in place, and no external state is changed.
| Tool | What it does | Input |
|---|---|---|
calculate_book_spine | KDP spine width and full-cover size from page count, paper, trim | numbers |
check_kdp_readiness | KDP formatting audit of a Word manuscript (9 checks) | .docx |
format_manuscript_preview | Typeset a manuscript into a 6×9 KDP interior — free preview | .docx |
format_large_print_edition | Typeset a LARGE PRINT 7×10 / 16pt edition — free preview | .docx |
format_epub_for_print | Turn a reflowable EPUB ebook into a 6×9 print interior — free preview | .epub |
check_epub_accessibility | EPUB accessibility audit (EAA / WCAG automatable subset) | .epub |
fix_epub_accessibility | Repair EPUB accessibility (existing Fix My EPUB customers, license key) | .epub + key |
check_pdf_accessibility | PDF accessibility audit (Section 508 / PDF-UA structural subset) | |
check_docx_accessibility | Word document accessibility audit (title, language, headings, alt text, tables, links) | .docx |
check_kdp_interior_pdf | KDP interior preflight — unembedded fonts, trim size, page limits, encryption | |
check_kdp_cover_pdf | KDP cover preflight against the exact full-wrap canvas for your book | .pdf + numbers |
check_ingramspark_interior_pdf | IngramSpark preflight — PDF/X-1a, output intent, RGB, transparency, fonts |
Try it (sample files)
- Sample manuscript (.docx): /sample/manuscript.docx — try
check_kdp_readinessorformat_manuscript_preview - Sample ebook (.epub): /sample/book.epub — try
check_epub_accessibilityorformat_epub_for_print - Sample interior (.pdf): /sample/book.pdf — try
check_kdp_interior_pdforcheck_pdf_accessibility
Limits & privacy
- File size limit: 15 MB per file.
- Typesetting previews of long books can take a few minutes; audits return in seconds.
- Files are processed to produce your report or preview and are not used for anything else. Details: privacy policy.
- Reports are automated formatting/accessibility aids — not a guarantee of retailer acceptance and not legal certification.