diff --git a/homeassistant/components/google_generative_ai_conversation/entity.py b/homeassistant/components/google_generative_ai_conversation/entity.py
index cfbe08a8fe77..08f60d0cb8fd 100644
--- a/homeassistant/components/google_generative_ai_conversation/entity.py
+++ b/homeassistant/components/google_generative_ai_conversation/entity.py
@@ -271,7 +271,12 @@ def _create_google_tool_response_parts(
     return [
         Part.from_function_response(
             name=tool_result.tool_name,
-            response=_validate_tool_results(tool_result.tool_result),
+            response=_validate_tool_results(
+                {
+                    "data": tool_result.result.data,
+                    "error": tool_result.result.error,
+                }
+            ),
         )
         for tool_result in parts
     ]
diff --git a/tests/components/google_generative_ai_conversation/snapshots/test_conversation.ambr b/tests/components/google_generative_ai_conversation/snapshots/test_conversation.ambr
index 9996cbab1d23..36544e6b152e 100644
--- a/tests/components/google_generative_ai_conversation/snapshots/test_conversation.ambr
+++ b/tests/components/google_generative_ai_conversation/snapshots/test_conversation.ambr
@@ -27,16 +27,12 @@
           name='HassGetCurrentTime',
           response={
             'data': {
-              'failed': [],
-              'success': []
+              'data': {<... 2 items at Max depth ...>},
+              'response_type': 'action_done',
+              'speech': {<... 1 item at Max depth ...>},
+              'speech_slots': {<... 1 item at Max depth ...>}
             },
-            'response_type': 'action_done',
-            'speech': {
-              'plain': {<... 2 items at Max depth ...>}
-            },
-            'speech_slots': {
-              'time': '16:24:17.813343'
-            }
+            'error': False
           }
         )
       ),
@@ -92,7 +88,10 @@
         function_response=FunctionResponse(
           name='test_tool',
           response={
-            'result': 'Test response'
+            'data': {
+              'result': 'Test response'
+            },
+            'error': False
           }
         )
       ),
diff --git a/tests/components/google_generative_ai_conversation/test_conversation.py b/tests/components/google_generative_ai_conversation/test_conversation.py
index a1ba7bde51d7..cea19de23b2e 100644
--- a/tests/components/google_generative_ai_conversation/test_conversation.py
+++ b/tests/components/google_generative_ai_conversation/test_conversation.py
@@ -269,7 +269,8 @@ async def test_function_call(
             "name": "test_tool",
             "parts": None,
             "response": {
-                "result": "Test response",
+                "data": {"result": "Test response"},
+                "error": False,
             },
             "scheduling": None,
             "will_continue": None,