From 9176571ec11cf37ce97b407f106dfebaeddc1729 Mon Sep 17 00:00:00 2001
From: echoVic <echoVic@users.noreply.github.com>
Date: Sun, 22 Feb 2026 18:11:22 +0800
Subject: [PATCH] fix(gemini): sanitize thoughtSignatures for native Google
 provider

Native Google Gemini provider was accumulating 2K-8K tokens of Base64
thoughtSignature blobs per turn, causing premature context overflow.

The sanitizer was only enabled for OpenRouter Gemini, not native Google.

Fixes #23392
---
 src/agents/transcript-policy.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/agents/transcript-policy.ts b/src/agents/transcript-policy.ts
index 20c58a1f8..0458c3d1a 100644
--- a/src/agents/transcript-policy.ts
+++ b/src/agents/transcript-policy.ts
@@ -110,9 +110,8 @@ export function resolveTranscriptPolicy(params: {
       ? "strict"
       : undefined;
   const repairToolUseResultPairing = isGoogle || isAnthropic;
-  const sanitizeThoughtSignatures = isOpenRouterGemini
-    ? { allowBase64Only: true, includeCamelCase: true }
-    : undefined;
+  const sanitizeThoughtSignatures =
+    isOpenRouterGemini || isGoogle ? { allowBase64Only: true, includeCamelCase: true } : undefined;
   const sanitizeThinkingSignatures = isAntigravityClaudeModel;
 
   return {