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The MCP server exposes the full GroupDocs.Annotation engine: every format the .NET library can annotate — 50+ document, spreadsheet, presentation, image, CAD, email, and web formats — is available to your AI agent through the annotation tools. The canonical matrix lives in the library documentation: supported document formats.

What agents are asked for most:

• PDF — the default review format: highlights, comments, strikeouts, and threads that any PDF reader will show.
• DOCX / DOC — mark up a draft without converting it first.
• XLSX — annotate figures in place, on the sheet where they live.
• PPTX — comment on slides during a deck review.
• Images (PNG, JPG, TIFF) — area, point, and arrow annotations work on scans and screenshots too.

Annotation types are the same across formats: textfield, area, point, arrow, highlight, underline, strikeout. Text-anchored types (highlight, underline, strikeout) need a text layer — on a scanned image, use area or arrow instead.

Not sure what you are holding, or how big its pages are? Ask — “what format is this and how many pages?” — and the agent answers via get_document_info.