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Paperform MCP by usefulapi
io.usefulapi/paperform in the official MCP registry.
Endpoint https://paperform.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Read Paperform forms, submissions, products and coupons, Papersign documents, and manage coupons.
We read its 23 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
paperform_list_forms paperform_get_form paperform_list_form_fields paperform_list_submissions paperform_get_submission paperform_list_partial_submissions paperform_get_partial_submission paperform_list_products paperform_get_product paperform_list_coupons paperform_get_coupon paperform_list_webhooks paperform_list_spaces paperform_list_space_forms paperform_list_papersign_documents paperform_get_papersign_document paperform_get_signed_document_url paperform_list_papersign_folders paperform_list_papersign_spaces paperform_create_coupon paperform_update_coupon paperform_set_product_quantity paperform_set_product_sold
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-usefulapi-paperform)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.