corretto bug: non corretta inizializzazione del modello e assegnazione dei tools

agent.py

@@ -38,7 +38,7 @@ wikipedia_tool = get_wikipedia_tool()
 tools = [search_tool, wikipedia_tool]
 
 # Bind tools to the model
-model = chat.bind_tools(tools)
+chat_with_tools = chat.bind_tools(tools)
 
 tools_by_name = {tool.name: tool for tool in tools}
 
@@ -72,7 +72,7 @@ def call_tool(state: AgentState):
 
 def call_model( state: AgentState, config: RunnableConfig):
     # Invoke the model with the system prompt and the messages
-    response = model.invoke(state["messages"], config)
+    response = chat_with_tools.invoke(state["messages"], config)
     # We return a list, because this will get added to the existing messages state using the add_messages reducer
     return {"messages": [response]}