video_hosted and video_vast canonicals. SSAI/CSAI mode, app environment, ad-pod position, measurement availability, and inventory guarantees belong on the product or placement.
video_vast and a required vast_tag slot. A multi-output creative agent may advertise separate SSAI and VAST capability IDs; buyers select them with target_capability_ids[] and receive portable canonical manifests.
Preview on the seller/publisher endpoint when device chrome, companion placement, ad-pod context, or remote-control interaction matters. The impression-time CTV renderer remains the seller runtime behind sync_creatives.
See Video, Multi-agent orchestration, and Creative delivery.