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Precleared MCP server

Which MCP servers are Precleared'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 2026-10-27

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Whose server it is
  • Registry namedev.precleared/contact-checkverified in the MCP registry

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

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools2
  • Server calls itselfprecleared
  • Server version1.3.0
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 640 ms.

Should an agent connect itNot proven either way yet
  • Its tools do check a cold email recipient's address before sending, but not get the footer requirements for a marketing email.
  • Checked on 6 of the 7 days it takes to judge reliability.

Once connected

  • For "check a cold email recipient's address before sending", the likely first call is contact_check.

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 2026-10-27
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
  • What an agent can do with it1 of 2 use cases
  • Answeredmeasuring6 of the 7 daily checks it takes to print a share
  • Median first answer1890 ms
  • Space in an agent's context≈ 1,284 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results2 of 3 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · check a cold email recipient's address before sending
  • cannot · get the footer requirements for a marketing email
  • not sure · keep a signed record of each compliance check

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 offers2 tools · read 2026-10-27
  • contact_check

    Is it legal to send a cold or marketing email to this person? Check before the first email to any new lead, prospect or contact who is not already a customer, one call per address: a compliance check for B2B sales outreach, prospecting…

  • verify_receipt

    Fetch a Precleared receipt by its id (cc_rcpt_...) to show what was checked, when, and the verdict, with the hashes, Ed25519 signature and public key needed to verify it. Use it when a person or an audit asks for proof of a check.

How to connect

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

{
  "mcpServers": {
    "contact-check": {
      "type": "http",
      "url": "https://precleared.dev/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http precleared https://precleared.dev/mcp

Add to CursorAdd to VS Code

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

OpenAPI spec

6 paths, read 2026-10-27. 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.