Feature request: add fill/sign submission operations to the MCP server

[gryphon2411]

Hi DocuSeal team,

Thanks for adding MCP support. I tested it on a self-hosted instance and the current tools are already useful for template/search/send workflows.

I ran into one gap: the MCP server currently seems limited to template/document management (create_template, search_templates, send_documents, search_documents), but not the actual submission fill/sign flow.

It would be very helpful if MCP could also support operations such as:

• create a submission without sending email
• prefill field values for a submitter
• return/open the signing URL
• complete/sign a submitter programmatically when appropriate
• download the completed document

This would make MCP much more useful for agent-driven workflows where the template is already prepared and the goal is to help a user fill and sign a document end-to-end.

Thanks again for the work on DocuSeal.