Remove SDK default ASR vendor fallback

Stop injecting asr.vendor=ares when no STT vendor is configured and rely on the API to apply its own default fallback instead.

Author: seymourtang

src/agora_agent/agentkit/agent.py

@@ -1077,8 +1077,6 @@ def _resolve_llm_config(self) -> typing.Dict[str, typing.Any]:
 
     def _resolve_asr_config(self, turn_detection_config: TurnDetectionInput) -> typing.Dict[str, typing.Any]:
         asr_config = dict(self._stt or {})
-        if not asr_config:
-            asr_config["vendor"] = "ares"
         asr_config["language"] = self._field_value(turn_detection_config, "language")
         return asr_config
 

tests/custom/test_request_body.py

@@ -327,6 +327,34 @@ def test_byok_pipeline_full_properties_shape() -> None:
     assert tts["params"]["voice_id"] == "voice123"
 
 
+def test_session_start_properties_without_stt_does_not_inject_default_asr_vendor() -> None:
+    agent = (
+        Agent(test_client(), turn_detection={"language": "zh-CN"})
+        .with_llm(
+            OpenAI(
+                api_key="openai-key",
+                base_url="https://api.openai.com/v1/chat/completions",
+                model="gpt-4o-mini",
+            )
+        )
+        .with_tts(
+            ElevenLabsTTS(
+                key="el-key",
+                model_id="eleven_flash_v2_5",
+                voice_id="voice123",
+                base_url="wss://api.elevenlabs.io/v1",
+            )
+        )
+    )
+
+    props = build_properties(agent, allow_missing={"asr"})
+
+    assert props["asr"] == {
+        "language": "zh-CN",
+    }
+    assert props["turn_detection"] == {"language": "zh-CN"}
+
+
 def test_session_start_properties_preserves_turn_detection_asr_language() -> None:
     """session.start() must keep asr.language from turn_detection (matches agora-agents-ts)."""
     from agora_agent.agentkit.vendors.cn import TencentSTT

tests/custom/test_stt_language.py

@@ -81,7 +81,7 @@ def test_invalid_turn_detection_language_is_rejected() -> None:
 def test_default_turn_detection_language_is_sent_without_stt() -> None:
     props = properties(base_agent())
 
-    assert props["asr"] == {"vendor": "ares", "language": "en-US"}
+    assert props["asr"] == {"language": "en-US"}
     assert props["turn_detection"] == {"language": "en-US"}