[Bugfix][Responses] Set completed status for Harmony function calls (#46945)

Signed-off-by: amanambak <aman.paswan@ambak.com>
Co-authored-by: amanambak <aman.paswan@ambak.com>
Co-authored-by: Chauncey <chaunceyjiang@gmail.com>

tests/entrypoints/openai/responses/test_harmony_utils.py

@@ -142,6 +142,7 @@ class TestHarmonyToResponseOutput:
         )
         assert output_items[0].call_id.startswith("call_")
         assert output_items[0].id.startswith("fc_")
+        assert output_items[0].status == "completed"
 
     def test_commentary_with_python_recipient_creates_reasoning(self):
         """Test that commentary with recipient='python' creates reasoning items."""

vllm/entrypoints/openai/responses/harmony.py

@@ -318,6 +318,7 @@ def _parse_function_call(message: Message, recipient: str) -> list[ResponseOutpu
             type="function_call",
             name=function_name,
             id=f"fc_{random_id}",
+            status="completed",
         )
         output_items.append(response_item)
     return output_items