Because they're the main prompt injection vector, I think you'd want to distinguish tool results from user messages. By the time you go that far, you need color

Because they're the main prompt injection vector, I think you'd want to distinguish tool results from user messages. By the time you go that far, you need colors for those two, plus system messages, plus thinking/responses. I have to think it's been tried and it just cost too much capability but it may be the best opportunity to improve at some point.