Hah, I was speed reading through the repo readme, and saw the "examples created 0shot with gpt5", then jumped to "codex-cli" and I thought "wow, that's a good flex, for them to re-do a codex-like implementation in 0shot, nice flex". Alas, it was not.
The examples seem like everything you'd expect, tho. THey do say it is a cherrypicked bunch, so take that as you may. At a glance nothing jumps out as wow.