Update agent.py

agent.py

@@ -26,7 +26,7 @@ from langchain_core.messages import SystemMessage, HumanMessage
 from langchain_core.tools import tool
 from langchain_community.tools.tavily_search import TavilySearchResults
 from langchain_community.utilities.wikipedia import WikipediaAPIWrapper
-from langchain.tools.python.tool import PythonAstREPLTool
+from langchain_experimental.tools.python.tool import PythonAstREPLTool
 
 # ---------------------------------------------------------------------
 # 0) Optionale LangSmith-Tracing  (setze ENV: LANGCHAIN_API_KEY)