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Vyfakturuj MCP by usefulapi
io.usefulapi/vyfakturuj in the official MCP registry.
Endpoint https://vyfakturuj.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Read and create Vyfakturuj invoices and contacts: search, number series, payment methods, tags.
We read its 10 tools on 2026-10-21. 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
vyfakturuj_list_invoices vyfakturuj_get_invoice vyfakturuj_create_invoice vyfakturuj_list_contacts vyfakturuj_get_contact vyfakturuj_create_contact vyfakturuj_get_template vyfakturuj_list_payment_methods vyfakturuj_list_number_series vyfakturuj_list_tags
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-usefulapi-vyfakturuj)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.