Engineering surprise
Magic is competence you did not ask for, made visible at the right moment. OFFER is the message type that carries it, and the rules that keep it from becoming noise.
Surprise is productive when it is grounded, traceable and controllable, and corrosive when it is random or silent. The council has exactly one mechanism for it.
Surprises come from cross-reading
The emergent behaviour worth having is this: Sound reading the script and noticing it ends on a silence; Camera reading the beats and proposing one unbroken take for the turn; Look & Cast noticing that a minor figure’s costume could carry the theme. Each department’s generator is asked one extra question on every wake: reading the other departments’ work, is there something worth offering that nobody asked for? Most wakes answer null. The ones that do not are the ones you remember.
Surprises live in proposals, never in locks
A department may OFFER anything. It may not change anything it does not own, and it may not change its own artifact in ways nobody asked for without saying so. The film never changes under you; it is offered to you, on the call sheet, next to the questions.
Every offer is grounded and previewed
An OFFER must cite what it read (noticed while: reading script v2), carry a text preview, and say what changes if accepted. Text is free; the preview is the offer’s cost ceiling until you tap try it. When you do, the owning department is woken with the offer as its instruction, incorporates it, and every stale critic re-reads. When you pass, it is recorded as offered and not taken, and the dailies list it.
A budget
One offer per department per wake. Enough that the dailies always contain something you did not ask for; few enough that the call sheet stays readable and the token cost stays flat.
The roads not taken
The other surprise is what the system chose not to do. At ideation the Director drafts three visibly different treatments and you choose; the two you did not choose are kept in the vision as roads not taken, with one line each on why they were different. Nothing builds trust faster than seeing the alternatives a system considered.
The right question is a surprise too
The best moment in a working session is the Producer asking something you had not thought of and instantly recognise as the real question. Whose clothes are these? is worth more than any generated frame. It comes from departments declaring their needs honestly at the gate, not from a clever prompt.
Anti-magic
For the avoidance of doubt: a silent rewrite, an untraceable change, a surprise that spends render budget without permission, or a delightful thing you cannot find again because nobody recorded where it came from.