Should you include tone of voice in the guidelines?
Yes, in a few lines: how you greet, how you name the dish or the treatment, and what you do not promise. You do not need a personality chapter if the floor cannot use those lines on a Saturday. Copy three real WhatsApp messages and three captions. Underline what sounds like the venue and strike what sounds like an ad. The sheet asks for a warm tone and the automatic reply is corporate. The patient hears it in the first sentence. Half a page on the usage sheet: two model lines and two banned ones, next to the mark. Whoever covers the chat has them, not an essay.