diff --git a/src/agents/transcript-policy.ts b/src/agents/transcript-policy.ts
index 3b1d6aa1db4..baa12eda96a 100644
--- a/src/agents/transcript-policy.ts
+++ b/src/agents/transcript-policy.ts
@@ -108,7 +108,10 @@ export function resolveTranscriptPolicy(params: {
     : sanitizeToolCallIds
       ? "strict"
       : undefined;
-  const repairToolUseResultPairing = isGoogle || isAnthropic;
+  // All providers need orphaned tool_result repair after history truncation.
+  // OpenAI rejects function_call_output items whose call_id has no matching
+  // function_call in the conversation, so the repair must run universally.
+  const repairToolUseResultPairing = true;
   const sanitizeThoughtSignatures =
     isOpenRouterGemini || isGoogle ? { allowBase64Only: true, includeCamelCase: true } : undefined;
 
@@ -116,7 +119,7 @@ export function resolveTranscriptPolicy(params: {
     sanitizeMode: isOpenAi ? "images-only" : needsNonImageSanitize ? "full" : "images-only",
     sanitizeToolCallIds: !isOpenAi && sanitizeToolCallIds,
     toolCallIdMode,
-    repairToolUseResultPairing: !isOpenAi && repairToolUseResultPairing,
+    repairToolUseResultPairing,
     preserveSignatures: false,
     sanitizeThoughtSignatures: isOpenAi ? undefined : sanitizeThoughtSignatures,
     sanitizeThinkingSignatures: false,