Start with the slice.
A cake has more than one job. It should feel right for the occasion, be practical to serve and give people the flavour they hoped for. Sponge, filling and finish belong in the same conversation as colour and lettering.
An honest kitchen brief explains what is being made, including the actual ingredients, the intended portions and any handling guidance. The design preview gives those questions a place; it does not supply a verified recipe or a dietary promise.