feat(realtime): include tool arguments in RealtimeToolEnd events, fixes consistency request from PR #2028

Author: ruskaruma

src/agents/realtime/events.py

@@ -90,6 +90,9 @@ class RealtimeToolEnd:
     tool: Tool
     """The tool that was called."""
 
+    arguments: str
+    """The arguments passed to the tool as a JSON string."""
+
     output: Any
     """The output of the tool call."""
 

src/agents/realtime/session.py

@@ -437,6 +437,7 @@ async def _handle_tool_call(
                     tool=func_tool,
                     output=result,
                     agent=agent,
+                    arguments=event.arguments,
                 )
             )
         elif event.name in handoff_map:

tests/realtime/test_session.py

@@ -994,6 +994,7 @@ async def test_function_tool_execution_success(
         assert tool_end_event.tool == mock_function_tool
         assert tool_end_event.output == "function_result"
         assert tool_end_event.agent == mock_agent
+        assert tool_end_event.arguments == '{"param": "value"}'
 
     @pytest.mark.asyncio
     async def test_function_tool_with_multiple_tools_available(self, mock_model, mock_agent):
@@ -1144,6 +1145,11 @@ async def test_tool_call_with_complex_arguments(
         assert isinstance(tool_start_event, RealtimeToolStart)
         assert tool_start_event.arguments == complex_args
 
+        # Verify tool_end event includes arguments
+        tool_end_event = await session._event_queue.get()
+        assert isinstance(tool_end_event, RealtimeToolEnd)
+        assert tool_end_event.arguments == complex_args
+
     @pytest.mark.asyncio
     async def test_tool_call_with_custom_call_id(self, mock_model, mock_agent, mock_function_tool):
         """Test that tool context receives correct call_id"""