dns-tools

dns-tools is a skill for Claude Code from rloisell/rl-agents-n-skills. It costs 94 tokens per session (2,440 once invoked), scanned B, original, no licence file.

A set of command-line tools for looking up and diagnosing Domain Name System (DNS) records, which connect website names to servers and services.

In plain words
What is it for?
Use it to inspect records such as web, mail, and name-server entries; trace delegation; check DNSSEC; test zone transfers; analyze cache times; and diagnose reverse lookups or split DNS.
Why use it?
It helps find why a domain name does not resolve correctly, or why different networks receive different answers.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the rl-agents-n-skills plugin — 41 skills, 24 agents shipped together

Good fit Use it to inspect records such as web, mail, and name-server entries; trace delegation; check DNSSEC; test zone transfers; analyze cache times; and diagnose reverse lookups or split DNS.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/rloisell/rl-agents-n-skills/dns-tools
Install

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.

Any agent
npx skills add rloisell/rl-agents-n-skills --skill dns-tools
Clone the repo
git clone --depth 1 https://github.com/rloisell/rl-agents-n-skills

Made for: Claude Code.

Or install rl-agents-n-skills, the plugin that ships this one along with the rest of its 41 skills, 24 agents.

Wrote 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.

agentmods badge for dns-tools

README.md
[![agentmods](https://agentmods.dev/badge/skills/rloisell/rl-agents-n-skills/dns-tools/github.svg)](https://agentmods.dev/skills/rloisell/rl-agents-n-skills/dns-tools)
Your own site
<a href="https://agentmods.dev/skills/rloisell/rl-agents-n-skills/dns-tools"><img src="https://agentmods.dev/badge/skills/rloisell/rl-agents-n-skills/dns-tools/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.

agentmods 80×15 button for dns-tools

Your own site · 80×15
<a href="https://agentmods.dev/skills/rloisell/rl-agents-n-skills/dns-tools"><img src="https://agentmods.dev/badge/skills/rloisell/rl-agents-n-skills/dns-tools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,440 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00094 $0.02440
Opus 5 $0.00047 $0.01220
Sonnet 5 $0.00019 $0.00488
Haiku 4.5 $0.00009 $0.00244

Measured 12d ago against content hash 03a0876c94cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade B, and why

dns-tools scanned grade B with 2 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 12d 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo dscacheutil -flushcache && sudo killall -HUP mDNSResponder

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl https://mta-sts.example.com/.well-known/mta-sts.txt
dns-tools/SKILL.md · 310 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 12d ago First seen · 310 lines · 94 tokens per session scan B 03a0876c94cf

Subscribe to this mod's changes

dns-tools is a skill published in the GitHub repository rloisell/rl-agents-n-skills (8 stars, last pushed 3mo ago), with no licence file. It adds 94 tokens to every session and 2,440 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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