b88adc4c50
PDF, docx, xlsx, pptx etc. are returned as EmbeddedResource with BlobResourceContents (base64 + mimeType). claude.ai processes these client-side, same as Google Drive/Dropbox MCP connectors. Fallback chain: text → image → embedded resource (binary). MIME type guessed from extension when server returns octet-stream. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>