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Billomat MCP by usefulapi
io.usefulapi/billomat in the official MCP registry.
Endpoint https://billomat.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Read Billomat clients, invoices, offers, credit notes, reminders; create clients and draft invoices.
We read its 34 tools on 2026-10-22. 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
billomat_get_current_user billomat_get_company billomat_list_clients billomat_get_client billomat_list_articles billomat_get_article billomat_list_suppliers billomat_get_supplier billomat_list_invoices billomat_invoice_totals billomat_get_invoice billomat_list_invoice_items billomat_list_invoice_payments billomat_list_recurring_invoices billomat_list_offers billomat_get_offer billomat_list_confirmations billomat_get_confirmation billomat_list_delivery_notes billomat_get_delivery_note billomat_list_credit_notes billomat_get_credit_note billomat_list_reminders billomat_get_reminder billomat_list_incoming_invoices billomat_get_incoming_invoice billomat_list_taxes billomat_list_units billomat_create_client billomat_update_client billomat_create_article billomat_create_draft_invoice billomat_add_invoice_item billomat_create_draft_offer
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[](https://lazaretto.dev/mcp-registry/io-usefulapi-billomat)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.