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Hail

io.github.hail-hq/hail-mcp in the official MCP registry. Endpoint https://mcp.hail.so/. Source: github.com/hail-hq/hail.

The registry describes it as: Phone, SMS and email for AI agents. One remote MCP endpoint, OAuth login, zero install.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

claude mcp add --transport http hail-mcp https://mcp.hail.so/

{
  "mcpServers": {
    "hail-mcp": {
      "url": "https://mcp.hail.so/"
    }
  }
}

code --add-mcp '{"name":"hail-mcp","type":"http","url":"https://mcp.hail.so/"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which. The free lazaretto-guard plugin reads a server's tools the moment Claude Code adds it and asks you if one of our rules matches.

Tools it advertises

place_call send_email upload_email_attachment get_call list_calls send_sms get_sms list_sms get_email list_emails get_email_raw get_email_attachment get_email_events get_email_stats get_events list_agents create_agent route_number quote_numbers acquire_number list_numbers list_number_regions get_number release_number get_verification_requirements submit_verification list_verifications get_verification cancel_verification confirm_verification get_agent update_agent delete_agent list_contacts lookup_contact list_email_domains whoami create_contact

Run this server? Show the check in your README

The badge reflects the latest weekly read:

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-hail-hq-hail-mcp/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-hail-hq-hail-mcp)

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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