Array of errors explaining why creative generation failed. For a canonical multi-output request, an output-scoped failure MUST set error.field to target_capability_ids[N] and SHOULD include the rejected value in error.details.capability_id. Whole-batch failures may omit output attribution. Deprecated target_format_ids requests retain legacy attribution during the 3.x compatibility window.
OptionalcontextOptionalext
Error response — creative generation failed. Multi-capability requests (
target_capability_ids[]) are atomic: a single output failing means the entire batch returns an error response. Deprecated target_format_ids requests retain equivalent compatibility behavior.