I want better diplomatic AI, so that I can have game long friends, like everybody else here wants.
But I also want more information. I hate it when a leader asks me for a declaration of friendship, but I have no idea what the repercussions will be. I need to know who that leader is enemies with, and how big their military is. There should be an adviser pop-up that shows their economy, military, and diplomatic status. I can't research this every turn on my own just in case they come to me asking for something.
I also want my foreign adviser to keep track of everything that the AIs do, and make her own in game Excel sheet telling me their military, backstabbing, tile improvement, navy, etc. habits, just like the one we all use anyway.