The Gemini CLI tool is atrocious. It might work sometimes for analyzing code, but for modifying files, never. The inevitable conclusion of every session I've ever tried has been an infinite loop. Sometimes it's an infinite loop of self-deprecation, sometimes just repeating itself to failure, usually repeating the same tool failure until it catches it as an infinite loop. Tool usage frequently (we're talking 90% of the time) fails. It's also, frankly, just a bummer to talk to. The "personality" is depressed, self-deprecating, and just overall really weird.
That's been my experience, anyway. Maybe it hates me? I sure hate it.