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MCP server validating PDF page trees: Kids->Page, Contents->stream, orphans, Count match.
About
MCP server validating PDF page trees: Kids->Page, Contents->stream, orphans, Count match.
Security Report
Valid MCP server (2 strong, 3 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry. Trust signals: trusted author (5/5 approved). 1 finding(s) downgraded by scanner intelligence.
5 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-jayjex-pdfcheck-mcp": {
"args": [
"-y",
"@jayjex/pdfcheck-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
pdfcheck-mcp
MCP server that validates PDF page-tree structure. Two tools, stdio transport, zero native dependencies.
Why
Most PDF checks stop at "does a stream object exist". That misses the real failure mode: a PDF can have 24 stream objects and still be unreadable because the page tree never points at them. We shipped 13 broken product PDFs this way. Every page dictionary was orphaned, /Contents pointed at font objects, and the stream-count QA passed anyway.
This server walks the object graph instead:
- every
/Kidsentry resolves to a/Type /Pageobject - every page
/Contentspoints to a stream object - no orphan
/Type /Pageobjects unreachable from/Kids - reachable page count matches the
/Countclaim - blank-page check: inflated content streams contain at least one
Tj/TJtext op
It handles classic (uncompressed) xref tables, which covers output from typical PDF generators. Compressed xref streams are rejected with a clear error rather than a false pass.
Install
npm install -g @jayjex/pdfcheck-mcp
Or run from GitHub without npm:
npx -y github:jayjex/pdfcheck-mcp
Claude Desktop config
{
"mcpServers": {
"pdfcheck": {
"command": "npx",
"args": ["-y", "@jayjex/pdfcheck-mcp"]
}
}
}
Tools
pdf_qa(path)
Full report for one PDF:
{
"file": "/tmp/report.pdf",
"ok": false,
"problems": [
"contents-not-stream=3 [{\"page\":7,\"reason\":\"obj 5 not stream (type Font)\"}]",
"orphan-pages=1 [13]",
"count-mismatch claimed=4 reachable=3"
],
"report": {
"size_claim": 4, "kids": 4, "kids_ok": 3,
"contents_ok": 0, "contents_bad": 3,
"zero_tj": [], "orphans": [13], "xref_entries": 14, "size_field": 14
}
}
pdf_batch(dir)
Flat scan of a directory, one pdf_qa per *.pdf (max 200 files, 50 MB each). Returns totals, a per-file kids/contents/orphans summary, and the full problem list for every broken file.
Local development
git clone https://github.com/jayjex/pdfcheck-mcp
cd pdfcheck-mcp && npm install
node test/smoke.mjs
test/fixtures/ holds two healthy PDFs and one deliberately broken (broken-wiring.pdf, a page-tree pointer-shift bug). The smoke test asserts 2 pass, 1 fails with the exact graph problems.
License
MIT
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