I see what you meant by national/state/local level agencies.
Well, it's somewhat fun for everything to think about what an "ideal" utopia would be - and it's interesting to see all the little differences in how different people would organize the world if everyone was themselves. It's enjoyable, but it's not particularly useful; given that we're all different individuals, with different values, and different ideas about even basic things, it's not really practical for anything in real life.
My question was more aimed at the idea that, given people are how they are, what's the best way to arrange things so that we achieve the best outcomes. Of course a lot of the issues are that we all have different ideas of what the "best outcomes" are in the first place.
i was thinking at the national level and bear in mind this is in a utopia, preferably a global one, and not necessarily my views on what is best for the here and now. police, justice, law making, and basic necessary services like fire and infrastructure would be handled at the local level. welfare for the severely disabled probably should remain with a national government but i would lump it in with healthcare but welfare for the poor would be left to local government jurisdiction. social security and unemployment would be handed over to the private sector or local jurisdiction. the military would be abolished and movement of people and goods unrestricted. borders would be drawn by election.
the general idea is to ensure all the people an equal start and finish to life. there are certainly obvious pitfalls for society in such an arrangement but if society were a bunch of mes running around, this would be the preferred way to organize it.