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ContactLint MCP server

Which MCP servers are ContactLint'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 2026-10-28

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Whose server it is
  • Registry namecom.contactlint/contactlintverified in the MCP registry

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

When we asked itchecked 2026-10-28
  • Stateanswerschecked 2026-10-28
  • Tools3
  • Server calls itselfcontactlint
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 38 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: flag mistyped email domains during signup; check contacts before an agent saves them to a CRM; clean a CSV contact list before sending.
  • Checked on 6 of the 7 days it takes to judge reliability.

Once connected

  • For "flag mistyped email domains during signup", the likely first call is validate_email.
  • For "clean a CSV contact list before sending", the likely first call is validate_emails.
  • Parameters are untyped or undescribed in 3 of 3 tools: check arguments before calling.

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: 6, the first on 2026-10-28
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
  • What an agent can do with it3 of 3 use cases
  • Answeredmeasuring6 of the 7 daily checks it takes to print a share
  • Median first answer84 ms
  • Space in an agent's context≈ 300 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsC · 67 of 100
  • Typed results0 of 3 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 3 of 3
  • Not saying whether it only reads or can destroy: 3 of 3

What an agent can do with it

  • can do · flag mistyped email domains during signup
  • can do · check contacts before an agent saves them to a CRM
  • can do · clean a CSV contact list before sending

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 offers3 tools · read 2026-10-28
  • validate_email

    Check an email address: syntax, MX/A records via DNS-over-HTTPS, disposable domain, role address, free provider, typo suggestion for major providers. No SMTP probing. Uses 1 check.

  • validate_emails

    Check a list of up to 50 email addresses in one call, with the same checks as validate_email. Returns one result per address in the same order plus a summary of verdicts. Uses 1 check per address; addresses whose DNS lookup fails come…

  • validate_phone

    Parse and validate a phone number: valid, possible, type, region, E.164 and national formats. Uses 1 check.

How to connect

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

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

Add it

Claude Code, in a terminal

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

Add to CursorAdd to VS Code

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

OpenAPI spec

8 paths, read 2026-10-28. Open the spec ↗

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.