domain-checker SKILL.md skillA
domain-checker from davidondrej/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add davidondrej/skills/domain-checker@git:20260926.7dce66cPins git:20260926.7dce66c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- davidondrej/skills
- Path
skills/research-and-web/domain-checker/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260926.7dce66c, committed Sep 26, 2026
- First version recorded
- Sep 25, 2026
- Size
- 2,349 bytes
- Repository stars
- 4,161
- License
- MIT
Check domain registration in batches using public RDAP APIs, without keys or login. Use only when the user explicitly invokes /domain-checker.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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.
```sh
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.
…Read the whole file at its exact version.
How to install
mdr add davidondrej/skills/domain-checker@sha256:ca23a3747f7dc910The line at the top of this page pins the label git:20260926.7dce66c, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_qwqnx3dixm6jbnq4)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Sep 25, 2026 and Sep 26, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260926.7dce66c latest | 2026-09-26 | 7dce66c | 2,349 B | A | view · diff |
| git:20260925.cb72780 | 2026-09-25 | cb72780 | 2,710 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2349 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
davidondrej/skills · 4,161 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qwqnx3dixm6jbnq4 GET https://markdownregistry.com/api/v1/resolve?ref=davidondrej/skills/domain-checker GET https://markdownregistry.com/api/v1/blob/ca23a3747f7dc9106bcf534ba32a25bcececa3d29e0a5b8743c92d91fb3a2c29
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.