It’s great that you’ve introduced Projects, but I don’t find them of great use if they the agents cannot have sub-subagents like in the agents we can spawn. I hope that you will add an additional subagents layer for them.
You’re right that today the agents a Project spawns can’t spawn subagents of their own, only the top-level Project agent can delegate. Letting those agents fan work out another level is something the team is actively working on, so keep an eye on upcoming releases!