I have Xcode 17.2 and 17.1 and I still cannot find it. It is Sept 27th. What am I missing?

Sounds like you are running up against the anthropic usage limitation. There is no metric data on what the trigger limit actually is, but I find myself clapped up against this about once a month or so (depending on how heavily I've been relying on the code assistant). Anthropic has an "unlimited" tier but it's something like $200 per month, so...

I too love the coding assistant. That is, until I get the "evil beachball of death" when scrolling the assistant panel down. This happens for me with both ChatGPT and Claude.AI, about 10 or 11 times a day. The only recourse I have is to Force Quit Xcode (26.1) and restart. It is particularly annoying when the cars happens in the middle of a fix or modification.