Update app.py

app.py

@@ -52,7 +52,7 @@ class BasicAgent:
             gemini_key = os.environ.get("GEMINI_API_KEY")
             
             # If we have at least one API key, use a model-based approach
-            if hf_token or openai_key or xai_key:
+            if hf_token or openai_key or gemini_key:
                 # Default model parameters - read directly from environment
                 model_type = os.environ.get("AGENT_MODEL_TYPE", "OpenAIServerModel")
                 model_id = os.environ.get("AGENT_MODEL_ID", "gpt-4o")