fix: interrupt message output before tool result

backend/tests/test_brains.py

@@ -1541,8 +1541,8 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
             ):
                 events.append("message_completed")
 
-        async def interrupt_output():
-            events.append("interrupted")
+        async def wait_for_output_stopped():
+            events.append("output_stopped")
 
         class OrderedCallEnd(FakeCallEnd):
             def __init__(self):
@@ -1580,7 +1580,7 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
             call_end=call_end,
             client_tools=client_tools,
             set_input_enabled=input_states.append,
-            interrupt_output=interrupt_output,
+            wait_for_output_stopped=wait_for_output_stopped,
         )
         brain._message_stages.set_client_tools(client_tools)
 
@@ -1598,6 +1598,7 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
         self.assertEqual(input_states, [False])
         self.assertEqual(client_tools.function_name, "show_message")
         self.assertEqual(client_tools.options["response_wait_mode"], "session")
+        self.assertTrue(client_tools.options["interrupt_on_result"])
 
         user_confirmed.set()
         result = await message_task
@@ -1605,7 +1606,7 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
         self.assertEqual(result.action, "confirmed")
         self.assertFalse(call_end.playback_completion.done())
         self.assertEqual(input_states, [False, True])
-        self.assertEqual(events[-2:], ["interrupted", "message_completed"])
+        self.assertEqual(events[-2:], ["output_stopped", "message_completed"])
 
     async def test_speech_only_message_waits_for_transport_playback(self):
         brain = WorkflowBrain(