Yn gryno, y bwriad clir yw ceisio cytundeb. Fodd bynnag, lle na bo hynny'n ymarferol, ceir mecanweithiau cryf lle caiff Gweinidogion Cymru fynegi barn.
n summary, the clear intent is on seeking agreement. However, where this is not feasible there are strong mechanisms for Welsh Ministers to exert their views.