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Benchmark Email MCP by usefulapi
io.usefulapi/benchmark-email in the official MCP registry.
Endpoint https://benchmark-email.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Manage Benchmark Email lists and contacts, and read campaign reports: opens, clicks, bounces.
We read its 25 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
benchmark_get_account benchmark_get_plan benchmark_get_settings benchmark_list_lists benchmark_get_list benchmark_get_list_fields benchmark_create_list benchmark_list_segments benchmark_list_contacts benchmark_get_contact benchmark_search_contacts benchmark_add_contact benchmark_update_contact benchmark_unsubscribe_contact benchmark_list_emails benchmark_get_email benchmark_list_email_reports benchmark_get_email_report benchmark_get_email_opens benchmark_get_email_clicks benchmark_get_email_bounces benchmark_get_email_unsubscribes benchmark_list_signup_forms benchmark_get_signup_form benchmark_get_signup_form_link
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-usefulapi-benchmark-email)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.