Capability classification for submit behavior.
OptionaldefaultOptional default value derived from callback payload.
Stable internal field key.
UI-oriented field kind.
OptionalmessageOptional callback message value.
OptionaloptionsOption collection for choice/confirmation callbacks.
Prompt text provided by the native callback payload.
Original native callback payload.
Typed callback reference for this field.
Indicates whether this callback is marked as required by callback payload.
Normalized callback field shape used by headless callback helpers.