Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer
Just Domain.
Overview
Description from the maker (original English)
Check a domain name, both prices and whether it can transfer in. You register it on justdomain.ai.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi2 of 3 passedChecked from public information; code not scanned yet
- UsageiVery new★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 2 of 3 passed Fail
- Runs on the maker’s server: what you ask it goes through their server.
- Can do 3 things (tools) search_domains, check_domain_transfer, check_trademark
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://mcp.justdomain.ai/Run this in your terminal
claude mcp add --transport http just-domain https://mcp.justdomain.ai/Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"just-domain": {
"url": "https://mcp.justdomain.ai/"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"just-domain": {
"type": "http",
"url": "https://mcp.justdomain.ai/"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://mcp.justdomain.ai/Menu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.
search_domainsUse this when the user asks whether a domain name is available or what it costs to register: call it directly with the names, with no account and no confirmation needed. That includes a name for a site the user built, or is building, with ChatGPT Sites. Read-only availability and
check_domain_transferRead-only transfer precheck for ONE domain the user already owns at another registrar: could it move to Just Domain, what is stopping it, what would it cost, and does its DNS survive the move. Nothing is ordered, charged, unlocked, or changed. The answer is built from two public
check_trademarkLooks like an instruction to the AIRead-only trademark check for ONE proposed name, answered by Open Trademarks (opentrademarks.org) from the US, EU and Israeli trademark registers. Nothing is filed, reserved, watched or paid for. Optional `goods` (free text, mapped to Nice classes), `classes` (Nice classes 1 to 4
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain justdomain.ai (the registry checks domain ownership)
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- ✓ Pass
Endpoint responds
Responded in 1145 ms (HTTP 200)
- – Not applicable
Sign-in with OAuth
No sign-in needed
- ✕ Fail
No hidden instructions in tool descriptions
1 tool descriptions contain text that looks like instructions to the AI. Read them below before installing
Compared with others in Otheri
- More stars than 0% of the other 18603 servers in this category
- Published to the registry more recently than 83% of the other 18603 servers in this category
- Basic checks equal to or better than 36% of the other 18603 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Just Domain. safe?
It passed 2 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.8.4) reached the registry 8 days ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Hominoport
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud✓ desktopcommander.app
Hominoport
A human nominee and body in the physical world for autonomous agents. Signed public offer.
Runs in the cloud✓ hominoport.org
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
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
| 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. |
check_trademark | Check ONE proposed name against the trademark registers Open Trademarks covers (US, EU and Israel), answered by Open Trademarks. A register with no read date in the answer was not checked. Returns a verdict (exact_live_mark, similar_live_marks, no_live_match, or not_checked, which is no verdict), the conflicting marks, and each register's read date. Optional goods, classes (Nice 1 to 45) and registers narrow it. A register search is not legal advice, and no answer clears a name. |
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.comUnauthenticated, 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_transferreports whether a domain is eligible and what one full term costs, and hands back atransfer_urlthat 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-domainManual 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.