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fix(ai): complete textSignature round-trip for Google providers

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- Store thoughtSignature on text blocks during streaming (all 3 providers)
- Replay textSignature as thoughtSignature in convertMessages
- Remove redundant conditional since retainThoughtSignature handles undefined

Per Google docs, text part signatures are optional but recommended for
high-quality reasoning in multi-turn conversations.
This commit is contained in:
theBucky 2026-01-12 01:14:14 +08:00 • committed by Mario Zechner
parent 4f757fbe23
commit a315cfe813
4 changed files with 16 additions and 19 deletions
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10
packages/ai/src/providers/google-gemini-cli.ts
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@ -511,12 +511,10 @@ export const streamGoogleGeminiCli: StreamFunction<"google-gemini-cli"> = (
});
} else {
currentBlock.text += part.text;
if (part.thoughtSignature) {
currentBlock.textSignature = retainThoughtSignature(
currentBlock.textSignature,
part.thoughtSignature,
);
}
currentBlock.textSignature = retainThoughtSignature(
currentBlock.textSignature,
part.thoughtSignature,
);
stream.push({
type: "text_delta",
contentIndex: blockIndex(),