>, your bot doesn't need to always play perfectly to not be detected

I'm pretty sure that current detection methods use a closeness metric (you can't use a "perfect GTO" metric because that would mean your observation horizon would have to be infinitely long)

> What tools would a poker TO employ?

Well, the simplest tool to start with would be preflop charts. And then solver charts for the usual betting sizes. At least that's where I would start if I were to implement such a system.