Here is the problem.

The AI took a neighboring city and immediately after offered me tribute.

There are several issues with this.

1) He should have been smart enough to offer it (and the implied 10 turn peace) BEFORE he took the city. Now that I know why he offers it, I'll never accept it. If he offered it before, I would have to make a blind decision which is more fun Do I take the safe money, or bet he takes the city and then take it over right away.

2) The offer doesn't show how much I'd be getting. (In this case it was a whopping 0.2 per turn)

3) The offer doesn't show when it expires while it's active. All offers should show in the tooltip how much longer they will be active.