silencer_pl, on 6th November 2011, 6:42am, said:
Then what is the point of casefire
It helps put the AI in a peaceable mood, I think (but no guarantees they'll actually make peace!), and keeps your ships from picking fights at un-occupied planets while allowing them at colonies. It's not so good for expanding peacefully since enemy ships over your new colonies will result in a fight, but it can reduce the violence of scouting.
None of the treaties are 'hard', though. The AI can rapidly switch in and out of them, just like any player. Don't assume they'll hold to the treaty indefinitely just because they signed it. Don't let the Hivers gate your worlds just because you're currently at peace!
There's also an issue where the AI winds up on the edge between preferred diplomatic states and flips back and forth, resulting in rapid-fire make/break alliances.