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domain-checker

Check registration records for several domains using public RDAP APIs, which provide domain registration data. Get distinct statuses for registered names, missing records, restrictions, and uncertain results without API keys, login, or a browser.

OriginalShow the original description

Check domain registration in batches using public RDAP APIs, without keys or login. Use only when the user explicitly invokes /domain-checker.

See how to install

Good for

  • Checking registration records for several domain candidates
  • Comparing a name across different domain endings
  • Reviewing restrictions and reasons for uncertain results

Files included (3)

  • SKILL.md2.3 KB
  • agents/openai.yaml43 B
  • scripts/check_domains.py3.5 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Domain checker

Run the bundled Python 3 checker without packages, credentials or a browser. Resolve scripts/check_domains.py relative to this SKILL.md, regardless of the working directory.

python3 <skill-dir>/scripts/check_domains.py example.com example.dev example.ai --json

Use complete domains, not bare brand names or URLs; expand each name/TLD combination. Only domains directly under a TLD are supported (e.g. .com, .dev, .ai, .cloud), not multi-label suffixes such as .co.uk.

The script discovers endpoints through IANA and queries public registries, not registrar shopping carts. Use small batches; concurrency is capped at 4 requests.

Read the results

JSON output is an array of {domain, status, detail} objects. Without --json, output is a short list and elapsed time.

  • REGISTERED: matching registration record found.
  • NOT_FOUND: registry reports no record. Not confirmed available: reservations, registration rules or premium pricing may prevent purchase.
  • UNAVAILABLE: registry explicitly reports a reservation or registration restriction.
  • UNKNOWN: unsupported registry, malformed response, timeout or HTTP error. Never treat as available.
  • INVALID: malformed name or input outside the helper’s scope.

Report briefly as a live snapshot, preserving exact domains and statuses. Explain UNKNOWN reasons. On rate limits, wait before retrying; do not increase concurrency. Bootstrap failure exits nonzero: no checks completed.

Read registry error bodies: a 404 may report a reservation, while Verisign may return an empty RDAP 404. The helper handles both but detects only some reservation wording. Neither DNS absence nor RDAP redirect-service errors prove availability.

Use a registrar for final purchase availability or premium quotes. Registration checks do not establish whether another company uses the name or provide trademark clearance.

Sources: IANA registry discovery, RDAP HTTP semantics, RDAP.org status and rate-limit distinctions.

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