diff --git a/packages/core/src/core/geminiChat.ts b/packages/core/src/core/geminiChat.ts
index 5e0a62c0..d1a7bdec 100644
--- a/packages/core/src/core/geminiChat.ts
+++ b/packages/core/src/core/geminiChat.ts
@@ -26,6 +26,10 @@ import {
   logApiResponse,
   logApiError,
 } from '../telemetry/loggers.js';
+import {
+  getStructuredResponse,
+  getStructuredResponseFromParts,
+} from '../utils/generateContentResponseUtilities.js';
 import {
   ApiErrorEvent,
   ApiRequestEvent,
@@ -138,7 +142,11 @@ export class GeminiChat {
   }
 
   private _getRequestTextFromContents(contents: Content[]): string {
-    return JSON.stringify(contents);
+    return contents
+      .flatMap((content) => content.parts ?? [])
+      .map((part) => part.text)
+      .filter(Boolean)
+      .join('');
   }
 
   private async _logApiRequest(
@@ -310,7 +318,7 @@ export class GeminiChat {
         durationMs,
         prompt_id,
         response.usageMetadata,
-        JSON.stringify(response),
+        getStructuredResponse(response),
       );
 
       this.sendPromise = (async () => {
@@ -546,12 +554,12 @@ export class GeminiChat {
           allParts.push(...content.parts);
         }
       }
-
+      const fullText = getStructuredResponseFromParts(allParts);
       await this._logApiResponse(
         durationMs,
         prompt_id,
         this.getFinalUsageMetadata(chunks),
-        JSON.stringify(chunks),
+        fullText,
       );
     }
     this.recordHistory(inputContent, outputContent);