Gemina MCP server

What it does

Gemina is an MCP server that tags, extracts data from, and searches documents including invoices, receipts, contracts, and forms. It offers a free tier for tagging (1,500 tags per month) and paid extraction and search features, with authentication via OAuth or API key.

• Tag PDFs and images to automatically extract metadata like vendor name, date, and amount, then rename files based on suggested patterns.
• Extract structured data from invoices, contracts, or custom document templates to pull out specific fields like line items, totals, or custom fields you define.
• Search and aggregate across your indexed documents to find invoices by vendor or date, and calculate sums, averages, and counts grouped by vendor, currency, or time period.

Tools this server exposes

Tool	Does
files_create_upload	Upload a document (PDF or image up to 50 MB) for processing.
tag_file	Tag an uploaded document to extract metadata and generate suggested filenames.
tag_url	Tag a document from a URL to extract metadata and generate suggested filenames.
files_create_extraction_upload	Upload a document for extraction using OCR or predefined models.
extract_document	Extract fields from a document using OCR, invoice models, or a custom template you define.
get_extraction_result	Retrieve the result of a document extraction.
list_extractions	List all extractions for your account.
get_extraction	Get details of a specific extraction.
get_document	Get details of a document.
submit_extraction_feedback	Send corrections to extracted fields to improve future extractions.
query_documents	Search indexed documents by vendor, date, amount, type, or free text.
aggregate_documents	Calculate sums, averages, and counts of indexed documents grouped by vendor, currency, type, or time period.
index_document	Index a document for search and aggregation.

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.