Need to specify a high lime content historic type stucco on brick masonry - are the joints in the bricks to be struck flush?
I’m not sure if there are any code requirements, but usually you want a rough surface for the stucco to bond to the wall, so I would say that a struck flush joint may be a little rougher than a tooled joint (assuming concave).
I speculate that tooled joints, being thicker, could change the curing of the plaster and telegraph to the surface. It may be helpful to test the suction of the surfaces to assure uniform water/cement content of plaster.