TL;DR works because I can see the length at a glance
And you cannot tell all AI. Only mainstream crap like ChatGPT and Gemini which is full of cached tropes and boilerplate formats so it all sounds the same.
My custom invoicing software automates notes based on years of my previous notes and tasks I did - looks nothing like AI.
Use a real library and local model, mess with settings, there is a lot more to this than the mainstream consumer apps.