[Ironhawk]

The agreements that I use in a game are

Trade: This isnt a formal treaty, but I find trading with another nation helps to establish relations.

NAP, duration based: My standard treaty. Used to secure borders.

NAP, unlimited: I will switch to a more permanent treaty if I think it unlikely that I will ever attack someone

War Pact: No war b/w the treaty members until the target of the war pact is defeated

Alliance: Unbreakable peace with another nation. Information and resources traded freely. Very rare for me as it means I will not attack the other nation even if its in my best interest.