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
Then ask your assistant to check a domain.
Tools
The same transfer facts are published over plain HTTP for agents with no MCP client:
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-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:
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.