Update app.py

app.py

@@ -9,11 +9,13 @@ from smolagents import CodeAgent, DuckDuckGoSearchTool, InferenceClientModel, Py
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 # --- Hugging Face API Key ---
-HF_API_KEY = os.environ["HF_TOKEN"]
+HF_API_KEY = os.environ.get("HF_API_KEY")
+if not HF_API_KEY:
+    raise ValueError("❌ Hugging Face API key not found. Please add it under Settings → Variables and secrets.")
 
 # --- Initialize Hugging Face Model ---
 model = InferenceClientModel(
-    model_id="google/embeddinggemma-300m",  # example HF chat model
+    model_id="HuggingFaceH4/zephyr-7b-beta",  # ✅ chat model
     token=HF_API_KEY
 )
 
@@ -30,15 +32,19 @@ class BasicAgent:
             ],
             model=self.model
         )
-        print("BasicAgent initialized with Hugging Face model.")
+        print("✅ BasicAgent initialized with Hugging Face model.")
 
     def __call__(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
         try:
             answer = self.agent.run(question)
+            if not answer:
+                return "⚠️ Model returned no answer."
+            return answer
         except Exception as e:
-            answer = f"AGENT ERROR: {e}"
-        return answer
+            print(f"❌ Error during agent run: {e}")
+            return f"AGENT ERROR: {str(e)}"
+
 
 # --- Run & Submit Function ---
 def run_and_submit_all(profile: gr.OAuthProfile | None = None):