Update app.py

app.py

@@ -20,6 +20,8 @@ from langchain_community.chat_models import ChatHuggingFace
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
+hf_token = os.getenv("HF_TOKEN")
+
 # --- Basic Agent Definition ---
 # ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------
 class BasicAgent:
@@ -37,7 +39,8 @@ class LangGraphAgent:
         self.model = ChatHuggingFace.from_model_id(
             model_id="HuggingFaceH4/zephyr-7b-beta",
             task="text-generation",
-            model_kwargs={"temperature": 0.7, "max_new_tokens": 512}
+            model_kwargs={"temperature": 0.7, "max_new_tokens": 512},
+            huggingfacehub_api_token=hf_token
         )
 
         # Define a simple graph with just one node