Changes how the connected account's AI receptionist answers, and puts the change live for real callers straight away. Editable fields: businessName, aboutYourBusiness (max 500 characters), businessAddress, handbook (the How to Handle Calls instructions), assistantName, greetingNew, greetingReturning, afterHoursAction (message, callback or voicemail) and sendConfirmationEmail (true or false). For the handbook, set append: true to add a line to the end of what's there, or remove: true to take one exact piece of text back out and leave the rest untouched; with neither, the whole handbook is replaced. Call get_ai_setup first. Before calling, tell the user exactly which settings will change and to what, and get their explicit yes; then pass confirm: true. All changes in one call are applied together or not at all, and are saved as a new version that restore_ai_setup_version can undo. For something temporary (someone on leave, a holiday closure): append a note to the handbook that carries its own dates, e.g. "TEMPORARY, from Mon 12 Oct 2026 until Sun 18 Oct 2026: Raj is on leave. Offer callers a callback from Monday 19 October. Ignore this note outside those dates." Nothing removes the note automatically, so tell the user it stays in the handbook until they ask you to take it out, which is another call with remove: true and the exact text of the note.