fix(genai): rollback model updates for function calling

Author: msampathkumar

genai/tools/tools_func_def_with_txt.py

@@ -34,7 +34,7 @@ def get_current_weather(location: str) -> str:
         return weather_map.get(location, "unknown")
 
     client = genai.Client(http_options=HttpOptions(api_version="v1"))
-    model_id = "gemini-2.5-flash-preview-05-20"
+    model_id = "gemini-2.0-flash-001"
 
     response = client.models.generate_content(
         model=model_id,

genai/tools/tools_func_desc_with_txt.py

@@ -24,7 +24,7 @@ def generate_content() -> str:
     )
 
     client = genai.Client(http_options=HttpOptions(api_version="v1"))
-    model_id = "gemini-2.5-flash-preview-05-20"
+    model_id = "gemini-2.0-flash-001"
 
     get_album_sales = FunctionDeclaration(
         name="get_album_sales",
@@ -73,7 +73,7 @@ def generate_content() -> str:
         ),
     )
 
-    print(response.function_calls[0])
+    print(response.function_calls)
     # Example response:
     # [FunctionCall(
     #     id=None,

genai/tools/tools_vais_with_txt.py

@@ -30,7 +30,7 @@ def generate_content(datastore: str) -> str:
     # datastore = "projects/111111111111/locations/global/collections/default_collection/dataStores/data-store-id"
 
     response = client.models.generate_content(
-        model="gemini-2.5-flash-preview-05-20",
+        model="gemini-2.0-flash-001",
         contents="How do I make an appointment to renew my driver's license?",
         config=GenerateContentConfig(
             tools=[