Wraps the GroupDocs.Signature .NET library so AI agents can sign, verify, and search for signatures across PDF, Word, and other document formats. You get eight tools covering text signatures, QR codes, barcodes, digital certificates, and image stamps. The Sign tool writes a new file with your signature applied. Verify checks validity and returns a report. The Search family extracts decoded text, certificate metadata, or base64 images depending on signature type. Runs via dnx with no install step, as a global dotnet tool, or in Docker. Native Linux and macOS deployments need libgdiplus for glyph rendering, but the Docker image bundles it. Point it at a documents folder and you can automate signature workflows through Claude or Copilot prompts.