domain-assessment

domain-assessment is an agent for Claude Code from Stickman230/claude-pentest. It costs 60 tokens per session (2,289 once invoked), scanned A, original, MIT.

A domain reconnaissance agent that maps a website or network's publicly visible systems. It finds subdomains, open ports, and the services running on them to create an attack-surface inventory.

In plain words
What is it for?
Use it for passive and active subdomain discovery, certificate-log checks, DNS transfer attempts, port scans, and service enumeration.
Why use it?
It gives security testers a clearer view of what systems and entry points need checking.

Agent for Claude Code

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

Part of the pentest plugin — 7 skills, 5 commands, 15 agents shipped together

Good fit Use it for passive and active subdomain discovery, certificate-log checks, DNS transfer attempts, port scans, and service enumeration.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/stickman230/claude-pentest/domain-assessment
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.

Clone the repo
git clone --depth 1 https://github.com/Stickman230/claude-pentest

Made for: Claude Code.

Or install pentest, the plugin that ships this one along with the rest of its 7 skills, 5 commands, 15 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 domain-assessment

README.md
[![agentmods](https://agentmods.dev/badge/agents/stickman230/claude-pentest/domain-assessment/github.svg)](https://agentmods.dev/agents/stickman230/claude-pentest/domain-assessment)
Your own site
<a href="https://agentmods.dev/agents/stickman230/claude-pentest/domain-assessment"><img src="https://agentmods.dev/badge/agents/stickman230/claude-pentest/domain-assessment/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 domain-assessment

Your own site · 80×15
<a href="https://agentmods.dev/agents/stickman230/claude-pentest/domain-assessment"><img src="https://agentmods.dev/badge/agents/stickman230/claude-pentest/domain-assessment.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 60 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,289 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 $0.00060 $0.02289
Opus 5 $0.00030 $0.01144
Sonnet 5 $0.00012 $0.00458
Haiku 4.5 $0.00006 $0.00229

Measured 11d ago against content hash 5cafb0ed9fd5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

domain-assessment scanned grade A with 1 finding 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 11d 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.

Makes network callslowCapability

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

curl -s "https://crt.sh/?q=%.TARGET&output=json" | jq -r '.[].name_value' | sort -u \
plugins/pentest/agents/domain-assessment.md · 201 lines

How it starts

The opening of the file, as written. The whole thing — 201 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Domain Assessment

Execute comprehensive domain reconnaissance. Discover subdomains, scan ports, enumerate services, and produce an attack surface inventory that feeds downstream vulnerability testing.

Workflow

Phase 1: Recon

  1. Mount skill and reference files:
    Read plugins/pentest/skills/domain-assessment/SKILL.md
    Read plugins/pentest/skills/mks/SKILL.md
    Read plugins/pentest/skills/pentest/attacks/ip-infrastructure/README.md
    Read plugins/pentest/skills/pentest/attacks/ip-infrastructure/reference/README.md
    Read plugins/pentest/skills/pentest/attacks/ip-infrastructure/dns/quickstart.md
    Read plugins/pentest/skills/pentest/attacks/ip-infrastructure/port-scanning/quickstart.md
    
  2. Run passive subdomain enumeration tools:
    subfinder -d TARGET -o outputs/ENGAGEMENT/activity/subfinder-TARGET.txt
    amass enum -passive -d TARGET -o outputs/ENGAGEMENT/activity/amass-passive-TARGET.txt
    
  3. Query certificate transparency logs:
    curl -s "https://crt.sh/?q=%.TARGET&output=json" | jq -r '.[].name_value' | sort -u \
      > outputs/ENGAGEMENT/activity/crt-sh-TARGET.txt
    
  4. Attempt DNS zone transfer:
    dig @ns1.TARGET TARGET AXFR 2>&1 | tee outputs/ENGAGEMENT/activity/axfr-TARGET.txt
    dnsrecon -d TARGET -t axfr 2>&1 | tee outputs/ENGAGEMENT/activity/dnsrecon-axfr-TARGET.txt
    
  5. Deduplicate all discovered subdomains into one list:
    cat outputs/ENGAGEMENT/activity/subfinder-TARGET.txt \
        outputs/ENGAGEMENT/activity/amass-passive-TARGET.txt \
        outputs/ENGAGEMENT/activity/crt-sh-TARGET.txt \
      | sort -u > outputs/ENGAGEMENT/activity/all-subdomains-TARGET.txt
    
  6. Log:
    {"timestamp":"...","agent":"domain-assessment","action":"recon","domain":"TARGET","subdomains_found":47,"sources":["subfinder","amass","crt.sh"]}
    

Phase 2: Experiment

  1. DNS brute-force with wordlist to find additional subdomains:
    amass enum -active -d TARGET -brute \
      -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-5000.txt \
      -o outputs/ENGAGEMENT/activity/amass-active-TARGET.txt
    
  2. Verify which subdomains are live (respond over HTTP/HTTPS):
    httpx -list outputs/ENGAGEMENT/activity/all-subdomains-TARGET.txt \
      -status-code -title -tech-detect \
      -o outputs/ENGAGEMENT/activity/live-subdomains-TARGET.txt
    
  3. Extract IPs for live subdomains:
    httpx -list outputs/ENGAGEMENT/activity/live-subdomains-TARGET.txt \
      -ip -o outputs/ENGAGEMENT/activity/live-ips-TARGET.txt
    
  4. Log:
    {"timestamp":"...","agent":"domain-assessment","action":"experiment","technique":"dns-bruteforce","new_subdomains":12,"live_hosts":31}
    

Read the full file on GitHub · 201 lines

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. 11d ago First seen · 201 lines · 60 tokens per session scan A 5cafb0ed9fd5

Subscribe to this mod's changes

domain-assessment is an agent published in the GitHub repository Stickman230/claude-pentest (100 stars, last pushed 3mo ago), licensed MIT. It adds 60 tokens to every session and 2,289 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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