adding duck duck go search

requirements.txt

@@ -6,4 +6,5 @@ sentence-transformers
 langchain-huggingface
 langchain-core
 langchain_openai
+duckduckgo-search
 langgraph

tools.py

@@ -1,11 +1,11 @@
 from langchain.tools import Tool
-from langchain_community.tools.duckduckgo_search import DuckDuckGoSearchTool
+from langchain_community.tools import DuckDuckGoSearchRun
 from langgraph.store.memory import InMemoryStore
 import random
 from huggingface_hub import list_models
 
 # Initialize the DuckDuckGo search tool
-search_tool = DuckDuckGoSearchTool()
+search_tool = DuckDuckGoSearchRun()
 
 # Initialize the memory store
 store = InMemoryStore(index={"embed": "openai:text-embedding-3-small"})