lol, I wish there was a better "gossip" sector to diplomacy. It would mitigate this problem a little bit. Instead of spies allowing you sometimes read an AI's mind it could just tell you what troops are doing at a given moment. Any civ that witnesses it could do it also voluntarily.
aka: they can't read your mind but India sees a ton of embarked troops of yours sailing past. He reports this to his friends and tells them the direction you're travelling instead of just ignoring it and his friends being surprised. Your AI friends would do the same. Telling you if they spotted enemy troops sailing an army past and where. Obviously there would have to be some controls. Aka: India wouldn't say this about 1 scout caravel but only if he saw 5 boats at once or some embarked army units with them (obviously an army).
You would hear your friends say gossip bits that would tie into the current denouncement/insult system but they'd say it about other civs and not just to you if they have beef with you, Examples:
1. India rings you up: "Greeting friend Darius, I thought you'd like to know I spotted Zulu troops moving past my borders. He looked to be headed in your direction." or "Friend Darius! That warmonger Zulu is amassing troops on my border and I fear he will soon attack. Would you mind sending some troops over to keep the peace?" or "would you care to make a defensive pact to discourage him?"
2. Babylon calls you up: "I'm tired of that fool Hiawatha invading peaceful civs' lands. Surely you will support me if it comes to war?"
3. Polynesia rings: "I spotted an Aztec embarked army with naval escorts sailing your way past my territory. I thought you might want to know what that fool was up too."
The AI and you already see these things and they would add nuance to diplomacy by allowing you to share your observations with other civs. They should have little effect diplomatically unless your warning proves true in which case you might get a: You warned them! modifier. I'd love it if you could lie about a few arbitrary statements too. Right now the only duplicitous thing in diplomacy is your promises and the way you use your denouncements. You can totally sell a bunch of AI to hate someone they just met if they knew and liked you first.
