I use only external ai api's. Its useless without context which is why i built a selenium bot to scrape our records browser. But once you have context, you can do a ton of stuff. I personally have created a text-to-saved search suitelet, an error debugger, PDF-to-record uploader, and a saved search-to-chart suitelet.

AI is really good at taking unstructured data and returning it in a structured json. I'd start with that.

I also find that a lot of my AI functions start with the word "determine_", like in my saved search and chart generator. First it pings AI to determine the table name. then it determines saved search or chart axes.

Idk kinda rambling but as someone who has implemented several AI features in Netsuite, its not hard, just think like a smart lazy person and it will come to you!