diachrony.net
April 24th

Domain Search Skill

For better or worse, I’m always looking for the next great domain name. Hours spent feverishly checking availability, weighing obscurity, and cursing premium pricing often preclude the more important work of actually starting a side-project. But domain hunting is fun, so who cares!

I usually want to find domains that riff on abstract concepts, using specific words, TLDs, or internal structure. This is tedious work by hand, so I built a skill that an AI agent (like Codex) can use to make finding available domain names much easier.

-> Check it out here! <-

The instructions in the readme should get you started. Once you get this skill set up, you can then try prompts like:

Find available domain names for a quiet note-taking app. Prefer .com names, but include strong domain hacks if they read as real words.

Your agent will use the skill to source and look up domain names, finding only the options which both fit your request and are available to register. As you might imagine, this skill also works well for multi-turn brainstorming, and you can task your agent with more complex domain-searching tasks as well. For example:

Find all four-letter birds that are available as domain names. Search only two and three letter TLDs.

I used $domain-search in Codex with that prompt, and after ~9 minutes of searching it found coua.app, smew.io, and huia.me, among many others. Those domains are available as of this writing, but it turns out the huia is extinct as of 1926. RIP!

The skill isn’t perfect, e.g. it occasionally reports unavailable domain names as available. Bugs are usually registrar-specific and easy to fix, but I’m not sure if I’ve caught all the edge cases yet. I’ll keep working on it.

PRs are welcome if you want to contribute ideas or bug fixes!

Matt Nichols 2026