updateFunction

app.py

@@ -5,7 +5,7 @@ from typing import Literal, Dict, Any
 from typing_extensions import TypedDict, Annotated
 
 import gradio as gr
-from langchain.tools import tool
+from langchain_core.tools import tool   # (recommended import)
 from langchain_huggingface import HuggingFacePipeline
 from langchain_core.messages import HumanMessage, AIMessage, ToolMessage, BaseMessage
 from langgraph.graph import StateGraph, START, END
@@ -25,14 +25,17 @@ llm = HuggingFacePipeline.from_model_id(
 # 2) Tools
 @tool
 def multiply(a: int, b: int) -> int:
+    """Multiply a and b."""
     return a * b
 
 @tool
 def add(a: int, b: int) -> int:
+    """Add a and b."""
     return a + b
 
 @tool
 def divide(a: int, b: int) -> float:
+    """Divide a by b."""
     return a / b
 
 tools = [add, multiply, divide]