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The MCP server exposes the full GroupDocs.Signature engine: every format the .NET library can sign, verify, and search — 30+ document, spreadsheet, presentation, image, and archive formats — is available to your AI agent. The canonical matrix lives in the library documentation: supported document formats.
What agents are asked for most:
- PDF — the full range: text, QR, barcode, image, and digital signatures, plus verification.
- DOCX / XLSX / PPTX — Office documents support digital signatures as well as visual marks, so a signed contract stays a Word file if that is what your process expects.
- Images (PNG, JPG, TIFF) — visual marks and code search work on scans; digital signing does not apply.
Not every type works on every format. Digital certificate signatures are supported on PDF and Office documents; visual marks (text, qrcode, barcode) work far more widely. If a signing call fails with an unsupported-format message, that mismatch is usually why — get_document_info tells you what you are actually holding.
Not sure what is already in a file? Ask — “what signatures does this document have?” — and the agent runs the search tools and reports back.
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