Borrowing it
Nothing to install: this file belongs to kemalabuteliyte/domain-whois-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kemalabuteliyte/domain-whois-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/kemalabuteliyte/domain-whois-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/instructions/kemalabuteliyte/domain-whois-mcp/claude-md)<a href="https://agentmods.dev/instructions/kemalabuteliyte/domain-whois-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/kemalabuteliyte/domain-whois-mcp/claude-md/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/instructions/kemalabuteliyte/domain-whois-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/kemalabuteliyte/domain-whois-mcp/claude-md.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 | $0.00297 | $0.00297 |
| Opus 5 | $0.00148 | $0.00148 |
| Sonnet 5 | $0.00059 | $0.00059 |
| Haiku 4.5 | $0.00030 | $0.00030 |
Grade A, and why
domain-whois-mcp CLAUDE.md 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 10d 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.
What it actually says
domain-whois-mcp
MCP server for domain WHOIS/RDAP lookups. TypeScript, Node.js 18+.
Build & Run
npm install && npm run build # compile TS → dist/
node dist/index.js # start MCP server (stdio)
npm run dev # watch mode
Project Structure
src/index.ts— MCP server entry point, all 8 tool definitionssrc/whois-client.ts— Native WHOIS TCP client with referral followingsrc/whois-parser.ts— Parses WHOIS text into structured data + availability detectionsrc/rdap-client.ts— RDAP HTTP client with IANA bootstrapsrc/iana.ts— IANA TLD registry: WHOIS server discovery, RDAP bootstrap, known servers DBsrc/types.ts— Shared TypeScript interfaces
Key Design Decisions
- Zero external dependencies beyond MCP SDK and Zod (no WHOIS npm packages)
- WHOIS uses raw TCP sockets (
node:net) for full protocol control - RDAP uses built-in
fetch(Node 18+) - IANA RDAP bootstrap cached in-process for 24h
- WHOIS server cache persists for process lifetime
- Referral depth capped at 3 to prevent loops
- Bulk check uses worker-queue pattern with configurable concurrency (1-10)
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.
- 10d ago First seen · 31 lines · 297 tokens per session scan A 8398615e29cb
domain-whois-mcp CLAUDE.md is an instructions file published in the GitHub repository kemalabuteliyte/domain-whois-mcp (0 stars, last pushed 4mo ago), licensed MIT. It adds 297 tokens to every session, about $0.0015 per session on Opus 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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