skill

domain-check-skill

An AI agent skill for batch-checking domain availability via whois.com, with Playwright automation, CAPTCHA/anti-bot assist, and optional DNS (nslookup) corroboration.

simp-lee/domain-check-skillcommunitylistedunreviewed

Use skill

Set up

Skills are installed by placing their folder where your agent loads skills.

Download ZIP from GitHub Open the repository

The download comes from github.com/simp-lee/domain-check-skill itself, not from our server, so what you get is exactly what its author published.

Install instructions come from the README

Skills do not use an MCP config. Follow the steps in the README below.

README

synced Oct 22, 2026

Domain Check

Batch domain availability checker via whois.com with automatic CAPTCHA handling.

Also works as a Claude Code Skill for AI-assisted domain checking.

Features

Batch check - Check multiple domains from command line or file
Auto CAPTCHA - Automatically clicks reCAPTCHA checkbox and submit button
Persistent profile - Reduces repeated CAPTCHA challenges across runs
JSON output - Export results for further processing
nslookup corroboration - Optional DNS verification for available domains

Installation

git clone https://github.com/simp-lee/domain-check-skill.git
cd domain-check-skill
npm run setup

This installs dependencies and downloads Chromium for Playwright.

Usage

Check domains from command line

node run.js scripts/domain-check.js --domains "example.com,myapp.ai,startup.io"

Check domains from file

node run.js scripts/domain-check.js --file domains.txt --out results.json

File format (one domain per line, # for comments):

# My domain candidates
example.com
myapp.ai
startup.io

With persistent browser profile (recommended)

node run.js scripts/domain-check.js --domains "example.com" --user-data-dir ./profile

Using a persistent profile reduces repeated CAPTCHA challenges.

Options

Option	Description	Default
`--domains`	Comma-separated list of domains	-
`--file`	Path to file with domain list	-
`--out`	Output JSON file path	(temp file)
`--nslookup`	Run nslookup for available domains	`false`
`--headless`	Run browser in headless mode	`false`
`--delay`	Delay between checks (ms)	`900`
`--timeout`	Page load timeout (ms)	`45000`
`--user-data-dir`	Persistent browser profile path	-
`--challenge-wait`	Max wait for CAPTCHA solve (ms)	`120000`
`--challenge-poll`	CAPTCHA polling interval (ms)	`1500`

Output

Terminal output:

example.com     available
myapp.ai        registered
startup.io      available

JSON output:

[
  { "domain": "example.com", "status": "available", "nslookup": null },
  { "domain": "myapp.ai", "status": "registered", "nslookup": null },
  { "domain": "startup.io", "status": "available", "nslookup": null }
]

Status values

Status	Description
`available`	Domain appears to be unregistered
`registered`	Domain is already registered
`unknown`	Could not determine status
`error`	Error occurred during check

How it works

Opens each domain's whois.com page
If CAPTCHA appears, auto-clicks checkbox and submit button
Parses page content to determine availability
Outputs results to terminal and optional JSON file

Use as Claude Code Skill

Add the domain-check-skill/ folder to Claude Code, then simply ask:

"Check if these domains are available: example.ai, myapp.io"

Claude will automatically use this skill to check domain availability.

Notes

Runs checks sequentially to reduce anti-bot triggers
Visible browser mode (headless=false) is default for CAPTCHA handling
If auto-click fails (e.g., image CAPTCHA), you can solve manually and press Enter

License

MIT