Google의 Gemini API가 응답과 함께 돌려주는 암호화된 thoughtSignature 필드를 둘러싼 기묘하고 우스운 관찰.
2025년 11월 18일
“API에서 돌려받은 이상한 것들”이라는 범주에 최근 추가된 항목은 Google의 Gemini API에 있는 thoughtSignature 필드다. 이것은 당신의 요청에 응답하면서 수행된 “생각”의 기록인데, 암호화되어 있다.
그래서 Gemini 3에게 기본적인 일을 시키면, 기본적인 답변이 돌아온다 … 그리고 믿을 수 없을 만큼 거대한 불투명 데이터 덩어리도 함께 돌아온다!
코미디 효과를 위해, 여기 그 전체를 그대로 제시한다:
{ "candidates": [ { "content": { "parts": [ { "text": "<대략 500자의 JSON>", "thoughtSignature": "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" } ], "role": "model" }, "finishReason": "STOP", "index": 0 } ], "usageMetadata": { "promptTokenCount": 1148, "candidatesTokenCount": 560, "totalTokenCount": 4499, "promptTokensDetails": [ { "modality": "IMAGE", "tokenCount": 1102 }, { "modality": "TEXT", "tokenCount": 46 } ], "thoughtsTokenCount": 2791 }, "modelVersion": "gemini-3-pro-preview", "responseId": "JaMcae6qPJyGz7IPnsDWkAQ" }
나는 로봇이 또렷하고 유용한 답변을 정중하게 내놓고는 … 잠시 멈추고 … 갑자기 불편해 보이는 표정을 짓다가 … 다시 입을 벌려 암호화된 생각의 꿀렁거리는 혼돈을 뿜어내는 모습을 상상한다. 일종의 계산적 트림이다.
멀티턴 상호작용의 경우, API는 다음 요청에서 이 데이터를 다시 넘겨주기를 기대한다. 하지만 우리 중 많은 사람은 상호작용을 단호하게 싱글턴으로 처리하므로, 우리에게 이것은 그저 수수께끼 같은 덩어리일 뿐이다.
이건 이상한 루프다, 거의 해킹에 가깝다. Google은 모든 요청에 대해 이 상태를 저장하고 싶어 하지 않는다. 그중 많은 요청은 결코 이어지지 않을 것이기 때문이다. 하지만 동시에 Google은 당신이 그것을 저장하는 것도, 아니 사실 읽는 것조차도 신뢰하지 않는다. 암호화 키가 어떻게 생성되는지 궁금하다 … 아마 API 키마다 하나씩 있을까?