Display an interactive PDF upload widget directly in the chat.
Use this when the user wants to upload a local PDF file from their device.
This is the standard upload method for MCP clients (e.g. Claude) where
file attachments with download URLs are not available.
Do NOT call upload_pdf when using this tool — the widget handles the upload automatically.
The widget renders inline and the PDF viewer appears after the user selects a file.
Do NOT call view_pdf after this tool; the widget manages the UI.
Never tell the user the file is still uploading; the widget handles the spinner.
After the user uploads via the widget and notifies you, call
check_upload_status(session_id=<session_id>) to discover the uploaded file
and its job_id before proceeding with any operation.
Connector