Just Domain - MCP Server

Check whether a domain is available and what it costs, and whether a domain you already own somewhere else could move here. Straight from chat.

Ask your AI assistant whether a name is free and what it costs, and it hands back a link to register it on justdomain.ai without leaving the conversation. Ask it about a domain you already own at another registrar and it reports what would block a transfer, whether your DNS survives the move, and the full-term transfer price. Both tools are read-only: nothing is bought, charged or changed in the chat.

Website: https://justdomain.ai
MCP endpoint: https://mcp.justdomain.ai/
Registry name: ai.justdomain/just-domain
Transport: Streamable HTTP (remote, nothing to install)
Auth: none. Both tools are read-only and unauthenticated.

Connecting

config.json

{
  "mcpServers": {
    "just-domain": {
      "type": "streamable-http",
      "url": "https://mcp.justdomain.ai/"
    }
  }
}

Then ask your assistant to check a domain.

Tools

Tool	What it does
`search_domains`	Check one or more domain names: returns availability, the registration price, the renewal price, and for available names a URL to open and register on justdomain.ai. Both prices are totals for one full registration term of that ending, not per-year rates: one year on most endings, two years on `.ai`, whose registry mandates a two-year term. Read-only; no order or payment in chat.
`check_domain_transfer`	Precheck ONE domain you already own at another registrar: what would block a transfer, who sponsors it today, whether its DNS keeps working through the move, and the full-term transfer price. Answered from the registry's own public RDAP record plus our registrar's price list, so it reads no account and no database. An empty `blockers` list is the only thing that means ready.

The same transfer facts are published over plain HTTP for agents with no MCP client:

Code

GET https://mcp.justdomain.ai/api/transfer/precheck?domain=example.com

Unauthenticated, read-only, no key. It is served by the MCP host above, not by the justdomain.ai website.

What these tools will not do

No purchase, no payment and no order is created by either tool. A registration is completed by a person in a browser on justdomain.ai.
Moving a domain in is not a self-service function yet. check_domain_transfer reports whether a domain is eligible and what it would cost; the move itself is arranged by a person, and the route is support@just-done.ai.
No authorization (EPP) code is ever returned, accepted or hinted at, and there is no agent path to unlocking a domain or to having a code issued. Moving a domain out is self-service, and self-service there means a human owner signed in on justdomain.ai in a browser: they switch the transfer lock off and get the code from their own account. An auth code is a bearer credential for the domain, and a chat transcript is not a place to put one.
Premium names are reported but cannot be registered or transferred through Just Domain yet.

Agent Skill (ChatGPT / Codex / any SKILL.md runtime)

This repo also ships a SKILL.md-format Agent Skill for Just Domain: a small package that teaches an agent when and how to use the two tools, and where to stop. It lives at skills/just-domain/.

Install (Codex / any GitHub-tree installer): point the skill installer at the GitHub tree URL:

Code

https://github.com/just-done/just-domain-mcp/tree/main/skills/just-domain

Manual install: copy the skills/just-domain/ folder into your runtime's skills directory: $CODEX_HOME/skills/ (or ~/.codex/skills/) for Codex, ~/.claude/skills/ for Claude.

The same package is served for discovery on the MCP host, for other runtimes and /.well-known scanners:

Index: https://mcp.justdomain.ai/.well-known/agent-skills/index.json
Skill: https://mcp.justdomain.ai/.well-known/agent-skills/just-domain/SKILL.md

The skill still needs the MCP server connected (see Connecting above). It declares that dependency in agents/openai.yaml.

Who it's for

Anyone naming a project, business or idea in a chat, anyone wondering whether the domain they already own could move somewhere better, and AI agents that need a real availability lookup with a clean handoff to registration.

About this repository

Public metadata and registry listing for the Just Domain MCP server: server.json, .mcp.json, icons, the skills/just-domain/ Agent Skill package, and this README. The server runs at https://mcp.justdomain.ai/; its source is not part of this repo.

License

MIT, see LICENSE.