I keep this bookmarked and check it frequently

https://chatgpt.com/codex/cloud/settings/analytics

The API endpoints on this page accept an OAuth token from ~/.codex/auth.json. You can simply ask Codex to create a report skill with some curl examples.

Orrrr... He could just as well click the link he has bookmarked already, and see it with his own eyes, without the token use to report on his token use.