fix(llm): adapt async tool results for compatible APIs

backend/tests/test_service_factory.py

@@ -4,13 +4,61 @@ import unittest
 from unittest.mock import patch
 
 from models import AssistantConfig
+from pipecat.processors.aggregators.llm_context import LLMContext
 from services.pipecat.service_factory import (
     HTTP_TTS_STOP_FRAME_TIMEOUT_S,
     WEBSOCKET_TTS_STOP_FRAME_TIMEOUT_S,
+    create_llm,
     create_tts,
 )
 
 
+class LLMServiceFactoryTest(unittest.TestCase):
+    def test_openai_compatible_llm_converts_async_tool_developer_result(self):
+        service = create_llm(
+            AssistantConfig(
+                llm_interface_type="openai-llm",
+                model="deepseek-chat",
+                llm_api_key="test-key",
+                llm_base_url="https://llm.example.test/v1",
+            )
+        )
+        context = LLMContext(
+            messages=[
+                {"role": "system", "content": "你是助手"},
+                {
+                    "role": "developer",
+                    "content": '{"type":"async_tool","status":"finished"}',
+                },
+                {"role": "user", "content": "ok"},
+            ]
+        )
+
+        params = service.get_llm_adapter().get_llm_invocation_params(
+            context,
+            convert_developer_to_user=not service.supports_developer_role,
+        )
+
+        self.assertEqual(
+            [message["role"] for message in params["messages"]],
+            ["system", "user", "user"],
+        )
+        self.assertNotIn("developer", str(params["messages"]))
+
+    def test_provider_can_explicitly_enable_developer_role(self):
+        service = create_llm(
+            AssistantConfig(
+                llm_interface_type="openai-llm",
+                model="gpt-compatible",
+                llm_api_key="test-key",
+                llm_base_url="https://llm.example.test/v1",
+                llm_values={"supportsDeveloperRole": True},
+            )
+        )
+
+        self.assertTrue(service.supports_developer_role)
+
+
 class TTSServiceFactoryTest(unittest.TestCase):
     def test_http_tts_keeps_wider_audio_chunk_timeout(self):
         config = AssistantConfig(