chore: Always skip executing partial function calls

Related: https://github.com/google/adk-python/issues/4159

Co-authored-by: Xuan Yang <xygoogle@google.com>
PiperOrigin-RevId: 859184844

src/google/adk/flows/llm_flows/base_llm_flow.py

@@ -38,8 +38,6 @@ from ...agents.readonly_context import ReadonlyContext
 from ...agents.run_config import StreamingMode
 from ...agents.transcription_entry import TranscriptionEntry
 from ...events.event import Event
-from ...features import FeatureName
-from ...features import is_feature_enabled
 from ...models.base_llm_connection import BaseLlmConnection
 from ...models.llm_request import LlmRequest
 from ...models.llm_response import LlmResponse
@@ -551,14 +549,11 @@ class BaseLlmFlow(ABC):
     # Handles function calls.
     if model_response_event.get_function_calls():
 
-      if is_feature_enabled(FeatureName.PROGRESSIVE_SSE_STREAMING):
-        # In progressive SSE streaming mode stage 1, we skip partial FC events
-        # Only execute FCs in the final aggregated event (partial=False)
-        if (
-            invocation_context.run_config.streaming_mode == StreamingMode.SSE
-            and model_response_event.partial
-        ):
-          return
+      # Skip partial function call events - they should not trigger execution
+      # since partial events are not saved to session (see runners.py).
+      # Only execute function calls in the non-partial events.
+      if model_response_event.partial:
+        return
 
       async with Aclosing(
           self._postprocess_handle_function_calls_async(