fix: populate function name in FunctionResponse parts

Ensures function name is included when converting interaction steps and deltas into FunctionResponse parts. Unit tests have been updated to verify that the name field is correctly populated.

PiperOrigin-RevId: 952413239

src/google/adk/models/interactions_utils.py

@@ -630,6 +630,7 @@ def _convert_interaction_step_to_parts(step: Step) -> list[types.Part]:
         types.Part(
             function_response=types.FunctionResponse(
                 id=step.call_id or '',
+                name=step.name,
                 response=_function_result_to_response(step.result),
             )
         )
@@ -1003,6 +1004,7 @@ def _handle_function_result(
   part = types.Part(
       function_response=types.FunctionResponse(
           id=delta.call_id or '',
+          name=delta.name,
           response=_function_result_to_response(delta.result),
       )
   )

tests/unittests/models/test_interactions_utils.py

@@ -824,11 +824,13 @@ class TestConvertInteractionOutputToParts:
     output = FunctionResultStep(
         type='function_result',
         call_id='call_123',
+        name='get_weather',
         result={'weather': 'Sunny'},
     )
     result_list = interactions_utils._convert_interaction_step_to_parts(output)
     result = result_list[0] if result_list else None
     assert result.function_response.id == 'call_123'
+    assert result.function_response.name == 'get_weather'
     assert result.function_response.response == {'weather': 'Sunny'}
 
   def test_function_result_output_preserves_none_values(self):
@@ -1468,6 +1470,7 @@ class TestConvertInteractionEventToLlmResponse:
         delta={
             'type': 'function_result',
             'call_id': 'call_9',
+            'name': 'get_temperature',
             'result': {'temp': 72},
         },
     )
@@ -1478,6 +1481,7 @@ class TestConvertInteractionEventToLlmResponse:
     assert result is not None
     part = result.content.parts[0]
     assert part.function_response.id == 'call_9'
+    assert part.function_response.name == 'get_temperature'
     assert part.function_response.response == {'temp': 72}
     assert len(state.parts) == 1