Wraps the GroupDocs.Annotation .NET library so AI agents can add, list, update, and remove annotations on PDFs and Word docs without you writing integration code. You get ten tools: highlight text, drop arrows and comments, manage reply threads, import and export annotations as XML, and render annotated page previews as inline PNGs. Ships as a dotnet global tool or Docker image. Linux and macOS need libgdiplus installed for the native binary since GroupDocs uses System.Drawing for rasterization, though the Docker route bundles everything. Useful when you want Claude or Copilot to mark up contract redlines, triage design feedback across pages, or migrate annotations between document versions through conversational prompts instead of clicking through a GUI.