feat(tool): add web search capability.

Integrate Tavily web search functionality

README.md

@@ -15,10 +15,21 @@ short_description: Agent for the final hands-on assignment of the Agents course
 
 ## Requirements
 
-To run this project, you need to have an OpenAI API key. Set your `OPENAI_API_KEY` as an environment variable:
+### Prerequisites
+- Python 3.x
+- Virtual environment (recommended)
 
+### API Keys
+This project requires the following API keys:
+- OpenAI API key
+- Tavily API key
+
+Set them as environment variables:
 ```bash
 export OPENAI_API_KEY='your-api-key'
+export TAVILY_API_KEY='your-api-key'
 ```
 
-You can get your OpenAI API key from [here](https://platform.openai.com/account/api-keys).
+You can get the required API keys here:
+- OpenAI API key: [OpenAI Platform](https://platform.openai.com/account/api-keys)
+- Tavily API key: [Tavily](https://tavily.com)

ShrewdAgent.py

@@ -4,6 +4,7 @@ from typing import TypedDict, Annotated, Optional, Any, Callable, Sequence, Unio
 from langchain_core.messages import AnyMessage, SystemMessage, HumanMessage
 from langchain_core.tools import BaseTool
 from langchain_openai import ChatOpenAI
+from langchain_tavily import TavilySearch
 from langgraph.constants import START
 from langgraph.errors import GraphRecursionError
 from langgraph.graph import add_messages, StateGraph
@@ -32,7 +33,7 @@ class ShrewdAgent:
                         Important: Your final output must be only a number or a short phrase, with no additional text or explanation."""
 
     def __init__(self):
-        self.tools = []
+        self.tools = [TavilySearch()]
         self.llm = ChatOpenAI(
             model="gpt-4o-mini",
             temperature=0,