Update tool.py

tool.py

@@ -4,9 +4,10 @@ from langchain_community.tools.tavily_search import TavilySearchResults
 from langchain_community.document_loaders.wikipedia import WikipediaLoader
 from langchain_community.document_loaders.arxiv import ArxivLoader
 from langchain_community.document_loaders.pubmed import PubMedLoader
+from langchain_community.tools.google_search.tool import GoogleSearchRun
+from langchain_community.tools.duckduckgo_search.tool import DuckDuckGoSearchResults
 from typing import Optional
 
-
 import os
 import tempfile
 import requests
@@ -17,6 +18,7 @@ import pandas as pd
 import uuid
 from youtube_transcript_api import YouTubeTranscriptApi
 
+
 ## Simple algebra tools
 @tool
 def add(a: float, b: float) -> float: 
@@ -91,6 +93,28 @@ def TavilySearchTool(query: str) -> str:
         ])
     return {"web_results": formatted_search_docs}
 
+google = GoogleSearchRun()
+duckduckgo = DuckDuckGoSearchResults()
+tavily = TavilySearchResults(max_results=3)
+
+@tool
+def combined_web_search(query: str) -> dict:
+    """Search Google, DuckDuckGo, and Tavily for a query and return combined results."""
+
+    google_docs = google.invoke(query)[:3]
+    duck_docs = duckduckgo.invoke(query)[:3]
+    tavily_docs = tavily.invoke(query)[:3]
+
+    all_docs = google_docs + duck_docs + tavily_docs
+
+    formatted_results = "\n\n---\n\n".join(
+        f'<Document source="{doc.metadata.get("source", "unknown")}" page="{doc.metadata.get("page", "")}"/>\n{doc.page_content}\n</Document>'
+        for doc in all_docs
+    )
+
+    return {"web_results": formatted_results}
+
+
 @tool
 def WikipediaSearchTool(query: str) -> str:
     """Search Wikipedia for a query and return maximum 2 results.