INDIVIDUAL MCP TOOL

check_domain

Use this when someone asks whether a domain's email authentication is set up correctly, why mail from a domain fails DMARC, SPF or DKIM, or which DNS records to publish for it.

domaincanary.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://domaincanary.com/mcp

No auth detected

Connect to this endpoint to inspect the live schema for check_domain and invoke it with your own arguments.

Indexed input schema

{}

Risk classification

Potential side effects detected · medium confidence · heuristic, not a guarantee.

A tool name or description contains a write-action term.
A tool name or description suggests sending messages.

Parent server

domaincanary.com

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.domaincanary]
url = "https://domaincanary.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "domaincanary": {
      "type": "http",
      "url": "https://domaincanary.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: domaincanary
Remote MCP URL: https://domaincanary.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "domaincanary": {
      "url": "https://domaincanary.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "domaincanary": {
      "type": "http",
      "url": "https://domaincanary.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "domaincanary",
  "transport": "streamable-http",
  "url": "https://domaincanary.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

Related tools

build_spf — Use this when someone lists the services that send their email and wants the SPF record to publish, or wants a sender added to the SPF record they already have.
explain_bounce — Use this when someone pastes a bounce message, an SMTP reply such as 550 5.
analyze_report — Use this when someone has a DMARC aggregate report and wants to know which senders passed and which failed.