domaincheck

Before you build on a name, check the name. domaincheck wraps the public Just Domain MCP service in a local stdio server and a small CLI, with three read-only lookups:

• search_domains — is the domain available, and what does one full registration term cost (plus the renewal price and, for available names, a checkout URL)?

• check_domain_transfer — for a domain you already own elsewhere: what would block a transfer in, would DNS survive the move, and what is the full-term transfer price?

• check_trademark — one proposed name against the US, EU and Israeli trademark registers read by Open Trademarks.

Prices are term totals, never per-year rates — on .ai the term is two years, so a quoted .ai figure covers two years. Nothing here places an order, files anything, or takes a payment: registration and transfer happen only in a browser on justdomain.ai, and a trademark register search is not legal advice and never clears a name.

How it works

Each call is forwarded as a JSON-RPC tools/call POST to https://mcp.justdomain.ai/ (no authentication), and the upstream's answer — SSE-framed, first data: line — is returned unchanged. Set JUSTDOMAIN_MCP_URL to use a different endpoint.

Related MCP server: namestack-domains-mcp

CLI

npx @reneturcios/domaincheck search acme.com acme.io
npx @reneturcios/domaincheck transfer acme.com
npx @reneturcios/domaincheck trademark "Acme Roasters"
npx @reneturcios/domaincheck --version

Output is the upstream's result as JSON. Exit codes: 0 on success, 1 on a runtime error (including an upstream failure), 2 on a usage error.

MCP server

npx -y @reneturcios/domaincheck mcp

MCP client config:

{
  "mcpServers": {
    "domaincheck": {
      "command": "npx",
      "args": ["-y", "@reneturcios/domaincheck", "mcp"]
    }
  }
}

Tools

• search_domains — availability and pricing lookup.

  • domains (array of strings, preferred) — 1-200 fully-qualified names, each including its TLD

  • query (string, fallback) — free text; names without a TLD expand to com/io/ai/co/net. Ignored when domains is supplied. One of the two must be given; the server errors honestly when both are absent.

• check_domain_transfer — transfer precheck for one domain.

  • domain (string, required) — one fully-qualified domain owned at another registrar

• check_trademark — one name against the trademark registers.

  • name (string, required) — the proposed name, 2-120 characters

  • goods (string, optional) — what the name is for

  • classes (array of integers, optional) — Nice classes, each 1-45

  • registers (array of us/eu/il, optional) — all three when left out

Docker

docker run -i ghcr.io/cloudcorprecords/domaincheck
docker run --rm ghcr.io/cloudcorprecords/domaincheck search acme.com

Development

npm install
npm run build   # tsc -> dist/
npm test        # tsx --test test/*.test.ts (fake fetch, no network)
npm run dev     # run the CLI from source

License

MIT — Copyright (c) 2026 Rene Turcios