Definition
Plain language
A lookup tool that tells you who registered a given website domain and when.
As stated in the literature
A protocol and tool for querying domain registration records; used as an example of a verifiable tool whose recorded outputs ground synthetic agent training tasks.
Why it matters: Because its answers come from real registration records, it provides ground-truth facts that can be used to check or build trustworthy agent tasks.
For example, you can run this lookup on a suspicious website to see what date its domain was registered and who registered it.
Heard on the show
“There's a whois lookup tool — you give it a domain name, it gives you back the registration record.”Episode 059 — Firefly's Inversion: Building Verified Tool-Call Training Data by Working Backward