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bexio MCP by usefulapi
io.usefulapi/bexio in the official MCP registry.
Endpoint https://bexio.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Read bexio contacts, invoices, quotes, bills, projects and journal; log time, draft invoices.
We read its 28 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
bexio_get_company_profile bexio_get_current_user bexio_list_users bexio_list_contacts bexio_get_contact bexio_list_invoices bexio_get_invoice bexio_list_invoice_payments bexio_list_quotes bexio_get_quote bexio_list_orders bexio_get_order bexio_list_articles bexio_list_projects bexio_get_project bexio_list_timesheets bexio_list_business_activities bexio_list_accounts bexio_list_journal bexio_list_taxes bexio_list_bank_accounts bexio_list_currencies bexio_list_business_years bexio_list_bills bexio_create_contact bexio_create_note bexio_create_timesheet bexio_create_draft_invoice
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[](https://lazaretto.dev/mcp-registry/io-usefulapi-bexio)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.