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 ofershap/mcp-server-dns --skill dns-lookupgit clone --depth 1 https://github.com/ofershap/mcp-server-dnsWrote 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/ofershap/mcp-server-dns/dns-lookup)<a href="https://agentmods.dev/skills/ofershap/mcp-server-dns/dns-lookup"><img src="https://agentmods.dev/badge/skills/ofershap/mcp-server-dns/dns-lookup/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/ofershap/mcp-server-dns/dns-lookup"><img src="https://agentmods.dev/badge/skills/ofershap/mcp-server-dns/dns-lookup.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 | $0.00031 | $0.00364 |
| Opus 5 | $0.00015 | $0.00182 |
| Sonnet 5 | $0.00006 | $0.00073 |
| Haiku 4.5 | $0.00003 | $0.00036 |
Grade A, and why
dns-lookup 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 8d 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
DNS Lookup via MCP
Use this skill when you need to look up DNS records, perform reverse DNS, check WHOIS data, or verify nameservers. Zero auth required.
Available Tools
| Tool | What it does |
|---|---|
dns_lookup |
Look up A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, or PTR records |
reverse_dns |
Reverse DNS (PTR) lookup on an IP address |
resolve_all |
Resolve A, AAAA, MX, TXT, NS, CNAME in one call |
check_nameservers |
Get nameserver (NS) records for a domain |
whois |
Query WHOIS data (follows IANA referrals to registrar) |
Workflow
- For general domain investigation: start with
resolve_allto see everything at once - For specific record types: use
dns_lookupwith thetypeparameter - For IP investigation: use
reverse_dnsto find the hostname - For domain ownership: use
whois
Key Patterns
dns_lookupwithtype: "MX"is the go-to for email delivery debuggingresolve_allreturns all common record types in one call — most efficient for initial investigationwhoisfollows IANA referrals automatically, so it works for any TLD- No API keys or auth needed — uses Node.js built-in DNS and public WHOIS servers
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.
- 8d ago First seen · 33 lines · 31 tokens per session scan A 087466a10ff9
dns-lookup is a skill published in the GitHub repository ofershap/mcp-server-dns (3 stars, last pushed 6mo ago), licensed MIT. It adds 31 tokens to every session and 364 once invoked, about $0.0002 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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