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DomainCanary MCP server

Which MCP servers are DomainCanary's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-21

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Whose server it is
  • Registry namecom.domaincanary/mcpverified in the MCP registry

The registry name sits under domaincanary.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-21
  • Stateanswerschecked 2026-10-21
  • Tools4
  • Server calls itselfdomaincanary
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-21 the server answered initialize and tools/list without a sign-in. First answer in 116 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: Approve each DMARC policy step before it is published; Roll back a policy step that blocks your own mail.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 8, the first on 2026-10-21
  • INITE MCP score72 of 100answers 100 · does the job 0 · definitions 100 · context 100 · connects 100
  • What an agent can do with it0 of 2 use cases
  • Answered100% of days8 of 8 daily checks
  • Median first answer131 ms
  • Space in an agent's context≈ 1,174 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results4 of 4 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • not sure · Find senders that send mail as your domain
  • cannot · Approve each DMARC policy step before it is published
  • cannot · Roll back a policy step that blocks your own mail

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-21
  • 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. Reads the domain's live DMARC, SPF and DKIM records and…

  • 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. Takes provider names such as Google Workspace or Mailchimp, include terms…

  • explain_bounce

    Use this when someone pastes a bounce message, an SMTP reply such as 550 5.7.26, or an Authentication-Results header and asks what it means or how to fix it. Returns what the receiving server refused, what to change, when it clears, and…

  • analyze_report

    Use this when someone has a DMARC aggregate report and wants to know which senders passed and which failed. The report is the XML, .gz or .zip file that receivers such as Google and Yahoo email to the address in a domain's rua tag. In…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Add it

Claude Code, in a terminal

claude mcp add --transport http domaincanary https://domaincanary.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://domaincanary.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.