Use Tavily Search instead of DuckDuckGoSearch

app.py

@@ -14,7 +14,7 @@ from pydub import AudioSegment
 import whisper
 import pandas as pd
 
-from duckduckgo_search import DDGS
+# from duckduckgo_search import DDGS
 
 from langgraph.graph import MessagesState, StateGraph, START
 from langgraph.graph.message import add_messages
@@ -23,6 +23,7 @@ from langgraph.prebuilt import ToolNode, tools_condition
 from langchain_openai import ChatOpenAI
 from langchain_core.messages import SystemMessage, HumanMessage, AnyMessage
 from langchain_core.tools import tool
+from langchain_tavily import TavilySearch
 
 
 # --- Constants ---
@@ -130,21 +131,17 @@ class BasicAgent:
 
     @staticmethod
     @tool(
-      description="Search the web using DuckDuckGo and return the best result snippet.",
+      description="Search the web using TavilySearch and return the final snippet.",
     )
-    def search_tool(question: str, max_length: int = 20000) -> str:
+    def search_tool(question: str, max_length: int = 100000) -> str:
         print(f"\nCalling search tool with: {question}, max_lentgh: {max_length}")
-        with DDGS() as ddgs:
-            hits = list(ddgs.text(question, max_results=5))
-            print("\nGot from DDGS:", hits)
-            ans = "\n".join((r.get("body") or r.get("snippet", "") for r in hits))
-
-        if not ans:
-            result = "No instant answer available for that query."
-        else:
-            result = ans[:max_length]
-        
-        print("\nTool result:", result)
+        search_ = TavilySearch(
+            max_results=5,
+            topic="general",
+        )
+        info = search_.invoke({"query": question})
+        result = "\n".join(m["content"] for m in info["results"])
+        print("f\nSearch result: {result}")
         return result[:max_length]
 
     @staticmethod