Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add just-done/just-domain-mcp --skill just-domaingit clone --depth 1 https://github.com/just-done/just-domain-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/just-done/just-domain-mcp/just-domain)<a href="https://agentmods.dev/skills/just-done/just-domain-mcp/just-domain"><img src="https://agentmods.dev/badge/skills/just-done/just-domain-mcp/just-domain/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/just-done/just-domain-mcp/just-domain"><img src="https://agentmods.dev/badge/skills/just-done/just-domain-mcp/just-domain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00233 | $0.03385 |
| Opus 5.5 | $0.00093 | $0.01354 |
| Sonnet 5.5 | $0.00047 | $0.00677 |
| Haiku 4.5 | $0.00023 | $0.00338 |
Grade A, and why
just-domain scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 251 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Just Domain - check domain availability, pricing and transfers, straight from the chat
Just Domain (https://justdomain.ai) lets you check whether a domain name is available and what it costs, and whether a domain somebody already owns elsewhere could move here, without leaving the conversation. You call one of the read-only tools on the Just Domain MCP server:
search_domains- availability and pricing for names nobody owns yet.check_domain_transfer- the transfer precheck for one domain the user already holds at another registrar.check_trademark- a name against the US, EU and Israeli trademark registers, answered by Open Trademarks.
All of them look up information only: no order is created, no payment is
taken, nothing is filed, and nothing about anybody's domain is changed. When a name is available,
search_domains hands back a link the user opens in a browser to register it
on justdomain.ai.
When to use this skill
The user says things like:
- "is acme.com available?" / "check acme.io and acme.ai"
- "what would acme.com cost?" / "how much is this domain?"
- "find me a domain for <project/business/idea>" (propose specific names, then check them)
- "give me a link to register acme.com"
- "can I move acme.com to Just Domain?" / "why won't my domain transfer?"
- "what would it cost to transfer acme.ai in?" / "will my site and email keep working if I move my domain?"
When NOT to use it
- Buying / paying / completing a purchase in the chat. This skill never
registers a domain and never takes payment. Registration happens only when
the user opens the
checkout_urlin a browser on justdomain.ai and completes checkout there. Do not tell the user you bought or reserved a name. - Actually moving, unlocking, renewing or reconfiguring a domain.
check_domain_transferREPORTS whether a domain could move and what that would cost. It does not move it, and nothing here does. The move itself is self-service for the owner, signed in on justdomain.ai/transfer in a browser, where they paste the authorization code and pay. Unlocking a domain held at Just Domain, and issuing its authorization (EPP) code, ARE self-service - for the owner, signed in on justdomain.ai, in a browser. That is not a capability you have: there is no agent path to either. See "The one refusal" below. - Renewals, DNS edits and nameserver changes on a domain the user owns. Not available through this server at all.
- Auto-expanding TLDs. The tool checks exactly the domains you pass. If the user wants alternatives, YOU propose the names and pass them explicitly.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago Changed · +33 lines · -2 tokens per session 30431eb2d0b3
- 1mo ago Changed · +119 lines · +11 tokens per session 1f98bb9b163e
- 2mo ago First seen · 99 lines · 224 tokens per session scan A c567cfd629a8
just-domain is a skill published in the GitHub repository just-done/just-domain-mcp (0 stars, last pushed 5d ago), licensed MIT. It adds 233 tokens to every session and 3,385 once invoked, about $0.0009 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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