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The gemini:generate_content URL hook rewrites any Antigravity endpoint to /v1internal:generateContent, but only the same-format passthrough and the two OpenAI decision paths ever built the matching envelope. A Claude Messages or Gemini client therefore reached the standard family planner, picked up the rewritten URL, and posted a bare Gemini body that upstream rejects with "Invalid JSON payload received. Unknown name \"contents\"" -- four retries across every account, then a 503 that names none of this. Route the standard family through the shared v1internal builder the same way gemini_cli already is, so the URL and the body come from one decision. The OpenAI-image-to-Gemini path cannot carry an envelope at all, so it now skips Antigravity candidates instead of sending a request upstream can only reject. Also stop treating a configured proxy as locally unsupported. The execution plan carries the proxy itself, and the generic and Vertex gates moved to transport_proxy_is_locally_supported long ago; Antigravity kept rejecting on proxy.is_some(), which no longer matches how the local runtime executes. A proxy that resolves to no route still disqualifies the request, and transport profiles stay unsupported because the v1internal payload never carries one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>