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SendGrid MCP by usefulapi
io.usefulapi/sendgrid in the official MCP registry.
Endpoint https://sendgrid.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.
The registry describes it as: Send email and read templates, marketing contacts, lists, stats, bounces and unsubscribes.
We read its 11 tools on 2026-10-25. 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
sendgrid_ping sendgrid_list_templates sendgrid_get_template sendgrid_list_marketing_lists sendgrid_get_contact_count sendgrid_search_contacts_by_email sendgrid_get_stats sendgrid_list_bounces sendgrid_list_global_unsubscribes sendgrid_send_mail sendgrid_add_or_update_contacts
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-usefulapi-sendgrid)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.
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