Gemini Interactions API: migrate off the old schema by May 26 or lose new features
AnalysisGoogle's Gemini Interactions API (v1beta) forces a breaking schema change this week. Starting May 26, the API defaults to a new steps array that replaces the existing outputs array; on June 8, the legacy schema disappears entirely. The change also removes response_mime_type in favor of a polymorphic response_format object. Developers who have not migrated are already behind: any Gemini feature released after May 7 only appears in the new steps format. A temporary escape hatch, the Api-Revision: 2026-05-07 header, works until June 8. After that, unmigrated code breaks completely with no fallback.