Both Claude and Gemini fell down on the task of creating a custom prompt based on Readwise and my personal blog. Or rather they did create prompts but it looked like they would not result in finding articles that actually interest me.
However, I turned Claude loose on my professional writing and it did pretty well at crafting a Google News query (actually several), which I will adapt for classifiers when I have time.
I will also try out natural language classifiers to see if they can be configured to dislike articles written in Spanish as well as articles about sports and gaming. I do not speak or read Spanish (though really I should learn) and I have no interest in sports or gaming.