Fix google-genai function calling (#18933)

Author: logan-markewich

llama-index-integrations/llms/llama-index-llms-google-genai/llama_index/llms/google_genai/base.py

@@ -395,7 +395,7 @@ def _prepare_chat_with_tools(
     ) -> Dict[str, Any]:
         """Predict and call the tool."""
         if tool_choice is None:
-            tool_choice = "any" if tool_required else "none"
+            tool_choice = "any" if tool_required else "auto"
 
         if tool_choice == "auto":
             tool_mode = types.FunctionCallingConfigMode.AUTO

llama-index-integrations/llms/llama-index-llms-google-genai/pyproject.toml

@@ -27,7 +27,7 @@ dev = [
 
 [project]
 name = "llama-index-llms-google-genai"
-version = "0.2.0"
+version = "0.2.1"
 description = "llama-index llms google genai integration"
 authors = [{name = "Your Name", email = "[email protected]"}]
 requires-python = ">=3.9,<4.0"

llama-index-integrations/llms/llama-index-llms-google-genai/tests/test_llms_google_genai.py

@@ -455,7 +455,7 @@ def test_prepare_chat_with_tools_tool_not_required(
 
     assert (
         result["tool_config"].function_calling_config.mode
-        == types.FunctionCallingConfigMode.NONE
+        == types.FunctionCallingConfigMode.AUTO
     )
     assert len(result["tools"]) == 1
     assert result["tools"][0].function_declarations[0].name == "search_tool"
@@ -470,7 +470,7 @@ def test_prepare_chat_with_tools_default_behavior(
 
     assert (
         result["tool_config"].function_calling_config.mode
-        == types.FunctionCallingConfigMode.NONE
+        == types.FunctionCallingConfigMode.AUTO
     )
     assert len(result["tools"]) == 1
     assert result["tools"][0].function_declarations[0].name == "search_tool"