FDT works on an assumption that other actors use a similar utility function as itself
FDT is not about interaction with other actors, it’s about accounting for influence of the agent through all of its instances (including predictions-of) in all possible worlds.
Coordination with other agents is itself an action, that a decision theory could consider. This action involves creation of a new coordinating agent that decides a coordinating policy that all members of a coalition carry out, and this coordinating agent also needs a decision theory. The coordinating agent acts through all agents of the coalition, so it’s sensible for it to be some flavor of FDT, though a custom decision theory specifically for such situations seems appropriate, especially since it’s doing bargaining.
The decision theory that chooses whether to coordinate by running a coordinating agent or not has no direct reason to be FDT, could just be trivial. And preparing the coordinating agent is not obviously a question of decision theory, it even seems to fit deontology a bit better.
FDT is not about interaction with other actors, it’s about accounting for influence of the agent through all of its instances (including predictions-of) in all possible worlds.
Coordination with other agents is itself an action, that a decision theory could consider. This action involves creation of a new coordinating agent that decides a coordinating policy that all members of a coalition carry out, and this coordinating agent also needs a decision theory. The coordinating agent acts through all agents of the coalition, so it’s sensible for it to be some flavor of FDT, though a custom decision theory specifically for such situations seems appropriate, especially since it’s doing bargaining.
The decision theory that chooses whether to coordinate by running a coordinating agent or not has no direct reason to be FDT, could just be trivial. And preparing the coordinating agent is not obviously a question of decision theory, it even seems to fit deontology a bit better.