Earlier quoted context omitted.
Gemini seems to be fairly good at keeping the custom instructions in mind. In mine I've told it to not assume my ideas are good and provide critique where appropriate. And I find it does that fairly well.
Same. This works fine for Claude in my experience. My user prompt is fairly large and encourages certain behaviours I want to see, which involves being critical and considering the strengths and weaknesses of ideas before drawing conclusions. As someone else mentioned, there does seem to be a phenomenon where saying DO NOT DO X causes a sort of attention bias on X which can lead to X occurring despite the clear instr…
It's a thing with people too[1], ie do not think about a white bear.