PDF Writer (PDF Agent Stack) MCP server

pdf-writer-mcp

日本語

MCP server that creates PDFs from text, Markdown, or tabular data and edits existing ones (metadata and page operations). Built on normativepdf — a clause-driven PDF library in which every behaviour is tied to an ISO 32000 clause — with CJK font embedding via harfbuzz subsetting.

Part of the PDF family alongside pdf-reader-mcp (structure analysis) and pdf-verify-mcp (authenticity verification). Where pdf-reader-mcp tells you what is in a PDF and pdf-verify-mcp tells you whether it is genuine, pdf-writer-mcp is the one that writes it.

Tools

[!IMPORTANT]

All file paths must be absolute (since v0.7.0). Relative paths and paths containing .. are rejected — a relative path would resolve against the MCP host's working directory, which is not the directory you think it is. This applies to inputPath, inputPaths, outputPath, outputDir, fontPath and attachmentPath. Input PDFs larger than 100 MB are also rejected.

Creation

Shared options: outputPath, returnBase64, fontPath, fontSize, pageSize (A4/A3/A5/LETTER/LEGAL), margin, title, author, onMissingGlyph, tagged, lang, pdfVersion.

PDF 2.0 output (v0.16.0)

Pass pdfVersion: "2.0" to write an ISO 32000-2 file. The default stays "1.7", and its bytes are unchanged.

The version is not only a header. ISO 32000-2 attaches two obligations to it, and both are met:

• trailer /ID becomes Required (Table 15). Both elements are equal on a first write (R-14.4-6), and the value stays deterministic under SOURCEDATEEPOCH.
• the Info dictionary keeps only CreationDate and ModDate (§14.3.3); the title, author and producer move to the XMP metadata stream, where PDF 2.0 says document metadata belongs.

{ "text": "Body.", "title": "Report", "pdfVersion": "2.0" }

tagged: true cannot be combined with it. The only accessibility declaration this server writes is PDF/UA-1 (ISO 14289-1), which is built on PDF 1.7 — putting it in a 2.0 file would be a claim nothing could measure. PDF/UA-2 output is not implemented, so the combination is refused rather than silently produced.

Tagged PDF / PDF/UA (v0.5.0)

Pass tagged: true to produce an accessible, tagged PDF conforming to PDF/UA-1 (ISO 14289). Output is verified compliant by veraPDF (--flavour ua1, 106/106 rules).

{ "markdown": "# Title\n\nBody.", "title": "Report", "tagged": true, "lang": "en" }

Markdown maps onto the structure tree: headings → H1–H6, lists → L/LI/LBody, tables → Table/TR/TH/TD (headers get /Scope), quotes → BlockQuote, code → Code. Rules, borders and code backgrounds become artifacts. Heading levels are normalised so they start at H1 and never skip — a Markdown # → ### jump becomes H1 → H2 in the structure, while visual sizes stay as authored.

Shortened. The full README is on GitHub.