Write the Free Start Frame End Frame AI endpoint contract

Split the query into two claims: a start-and-end-frame control exists, and a usable entitlement costs nothing in the relevant account context. Evidence for one claim cannot establish the other. Inventory source rights for both images and mark any identity, product, text, or location detail that cannot change. Endpoint control is meaningful only when the transition has a defined editorial job and the two supplied states are compatible enough to review. Before revision, preserve the handoff draft, and ask the model evaluator to record evidence freshness before the workflow transfer.

Inspect the path, not only the two supplied images

Verify the exact model and control in official documentation, then inspect the current product surface for limits, credits, watermarks, export conditions, and commercial-use terms without assuming permanence. Review intermediate frames at a consistent cadence for geometry, identity, contact, lighting, camera axis, and causal order. A model can reproduce the beginning and ending while inventing an unusable bridge, so acceptance belongs to the whole shot rather than two thumbnails. Before revision, preserve the delivery checklist, and ask the continuity editor to record destination fit before the acceptance review.

• Opening-state fidelity At handoff, preserve the review copy, and ask the creative lead to record control availability before the delivery pass.
• Causal intermediate motion At handoff, preserve the test fixture, and ask the policy reviewer to record evidence freshness before the delivery pass.
• Closing-state and edit usability At handoff, preserve the source ledger, and ask the rights reviewer to record temporal order before the delivery pass.

Separate capability, availability, and entitlement

Treat missing, login-gated, regional, trial-only, or stale entitlement details as unresolved; do not translate a free signup or promotional credit into ongoing production entitlement. Verify the exact vendor, model version, region, account surface, input constraints, and check date before relying on the feature. The documented Veo example proves a named control in that context; it does not prove current SEELE access or any free, downloadable, permanent, or open-ended use. At handoff, preserve the decision history, and ask the identity reviewer to record format readiness before the delivery pass.

Keep the Free Start Frame End Frame AI evidence ledger narrow

Google DeepMind first-party documentation verifies a current first-and-last-frame control for Veo 3.1. Record the source owner, product or model name, verification date, surface or region, exact claim, and unresolved gap beside the test. Taxonomy eligibility and search demand explain why the page exists, but neither can be reused as proof that SEELE or another provider exposes the entire query as a current capability. Before approval, preserve the claim inventory, and ask the continuity editor to record reversal cost before the source comparison.

• Google DeepMind lists first and last frame among the documented creative controls for Veo 3.1. Before approval, preserve the authorization record, and ask the delivery owner to record human approval before the source comparison.