Just Domain.

Just Domain - MCP Server

Check a domain name, both prices and whether it can transfer in, and check the name against trademark registers. You register it on justdomain.ai.

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. Ask it whether a name is already a trademark and it checks the registers Open Trademarks (https://opentrademarks.org) has read, naming each register and its read date. Every tool is read-only: nothing is bought, filed, 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. Every tool is read-only and unauthenticated.

Connecting

{

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

Then ask your assistant to check a domain.

Tools

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

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, no filing and no order is created by any tool. A registration is completed by a person in a browser on justdomain.ai.
• Moving a domain in is self-service in a browser: the owner checks it and pays at https://justdomain.ai/transfer, pasting the authorization code there. check_domain_transfer reports whether a domain is eligible and what one full term costs, and hands back a transfer_url that opens that page for the domain.
• No trademark tool clears a name. Never tell a user a name is clear unless it was checked in the same conversation and every register in the answer was read today or yesterday.
• 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](https://learn.chatgpt.com/docs/build-skills)-format Agent Skill for Just Domain: a small package that teaches an agent *when* and *how* to use the three 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:

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 or whether a name is already a trademark, 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.