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Gemini may return a turn's thoughtSignature in a later SSE chunk as a part with empty text content, per the streaming docs. The current parsing loop reads the signature but drops it — the part has no text and no functionCall, so nothing is emitted. Tool-use turns then replay without a signature and the follow-up request fails with INVALID_ARGUMENT. Track the first tool call of the turn; when a closure signature part arrives, re-emit a tool-call delta with the same ID so the consumer can merge the signature by ID. Turns that had no tool call fall back to a thinking block so the signature still round-trips. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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