How AI assistants search domains

On their own, ChatGPT and Claude can’t check whether a domain is available — they can only guess from training data. Connect the Just Domain MCP server and the assistant calls search_domains to return live availability and a checkout link. The assistant finds the name; you complete registration in the browser.

Why assistants can’t check availability alone

A language model doesn’t have a live view of the domain registry. Ask it “is this domain available?” and, without a tool, the best it can do is guess from stale training data — which is why nearly every guide on finding a domain with AI ends with “now go verify it at a registrar.” The missing piece is a real-time lookup the assistant can call.

Connect the Just Domain MCP

Just Domain publishes a hosted Model Context Protocol server. Point any MCP-compatible assistant at it and the assistant gains one tool, search_domains:

• Endpoint: https://mcp.justdomain.ai/
• Transport: Streamable HTTP
• Authentication: none — search is anonymous, no account or API key

For step-by-step install in Claude, ChatGPT, Cursor, and other clients, see the full MCP server docs and the for-agents page. This page focuses on what the search itself does.

What the assistant gets back

For each candidate name, search_domains returns live availability, the current rate, and a ready-to-use checkout URL. The values below show the shape of a response — the actual availability and price are whatever the live check returns at the moment you ask:

{
  "domain": "example-name.ai",
  "available": true,
  "price_usd": 89.00,
  "currency": "USD",
  "checkout_url": "https://justdomain.ai/checkout?domain=example-name.ai"
}

The boundary: search, not buy

The public MCP tool is search-only, on purpose. An assistant can find available names and hand you a checkout link, but it cannot complete a purchase inside the chat. Payment never enters the conversation — you open the checkout link in your browser and pay through Stripe yourself. There is no agent-callable buy tool, no card in the chat, and no separate agent path: the assistant hands you the same names and the same checkout you’d reach on your own.

Prompts that work

• “Find me a short .ai domain for a notes app, and check which ones are actually available right now.”
• “bluebird.com is taken — check .io, .app, .ai, and .dev for available alternatives and give me a checkout link for the best one.”
• “Is there an available .com for my coffee newsletter? Suggest five and check each live.”

New to the whole idea of a domain agent? See domain-agent.ai for the broader guide to finding, buying, connecting, and managing domains through AI.

Using the Just Domain tool, find me available domains for [describe your project]. Check .com, .ai, and .io live, then give me the best available name with its checkout link. I'll open the link and complete the purchase in my browser.