audio processing (fix)

agent.py

@@ -44,7 +44,7 @@ def visual_qa(image_url: str, question: str) -> str:
 
 
 @tool
-def transcribe_audio(audio_url):
+def transcribe_audio(audio_url: str) -> str:
     """
     Provides functionality to perform audio transcription.
 
@@ -60,6 +60,7 @@ def transcribe_audio(audio_url):
         file=requests.get(audio_url).content,
         response_format="text",
     )
+    return r.text
 
 
 class GAIAAgent: