menambahkan MessagePlaceholder pd app

app.py

@@ -193,7 +193,9 @@ agent_prompt = ChatPromptTemplate.from_messages(
         ),
         MessagesPlaceholder(variable_name="chat_history"),
         ("human", "{input}"),
+        MessagesPlaceholder(variable_name="tools"), 
         MessagesPlaceholder(variable_name="agent_scratchpad"),
+        MessagesPlaceholder(variable_name="tool_names"),
     ]
 )