Ever wondered why all the big companies are building their own AI agents now? Like whats so special about AI agents that normal LLMs cant do? Well, I had the same question and I decided to build one myself to understand it better.

In this blog, I am going to walk you through how I built a complete Google Search AI Agent using Python, LangChain and Groq (which gives us free LLM APIs). And trust me, its way more simpler than you think.

First Things First - What Even is an AI Agent?

Before we jump into the code, lets understand the basics.

We all use LLMs right? ChatGPT, Gemini, Claude, all of these are Large Language Models. And what do they do? You give them a question in text, they generate an answer in text. Simple.

But heres the problem. LLMs can ONLY generate text. Thats it. They cant do anything else beyond that.

Can they go to Google and search something for you? Nope.

Can they book a movie ticket for you? Nope. They can tell you HOW to book a ticket, but they cant actually book it for you.

Why? Because LLMs dont have permission to access any website, any URL or even the internet. They can only answer based on whatever data they were trained on. And thats a huge limitation.

The solution is we connect TOOLS to our LLMs. And this is where things get interesting.

Tools are basically nothing but normal functions from your programming language. Thats it. If you are using Python, then Python functions become your tools. If you are using JavaScript, then JavaScript functions become tools.

So what we do is, we connect multiple tools to our LLM. Like a Google Search tool, a Database tool, a Weather tool, whatever you need.

Now when a user asks a question, the LLM first checks - can I answer this from my own knowledge? If yes, great, it answers directly. But if the LLM feels like it doesnt have the answer in its internal knowledge, then it looks at the tools connected to it. It finds the right tool, calls it, gets the response, and then generates a final answer for the user.

This whole process - user asks a question, LLM decides which tool to call, tool gives back data, LLM generates the final answer - this entire system is what we call an AI Agent.

We are building a Google Search AI Agent. Meaning an agent that can either answer from its own knowledge or go search on Google and give us real time answers.

 as our framework (amazing framework for building AI apps)

Alright lets start coding. First create a project folder and open it in your code editor.

langchain
langchain-groq
python-dotenv
langchain-community

. Create an account if you dont have one. Go to the API section and create a new API key. Make sure you copy it before clicking Done because once you click Done, you wont be able to see it again. You will have to delete it and create a new one.

 Sign up for a free account. Go to API Keys section and copy your key.

 file in your project root and add both keys:

GROQ_API_KEY=your_groq_api_key_here
SERPER_API_KEY=your_serperapi_key_here

So what is LangChain? In simple words, LangChain is a Python framework that helps us build GenAI applications easily. With LangChain we can:

Connect to many different LLM models very easily (OpenAI, Groq, Google, Anthropic, etc)

Build AI agents in the simplest way with very few lines of code

LangChain supports Python and JavaScript both. We are going with Python today.

And why Groq? Because Groq provides us many LLM models for free. Like Llama 3.3 70B, GPT alternatives and many others. They have a very generous free tier which is perfect for learning and building projects.

Before building the agent, lets first see how a normal LLM works and what its limitations are.

from dotenv import load_dotenv
load_dotenv()

from langchain_groq import ChatGroq

llm = ChatGroq(model="llama-3.3-70b-versatile")

query = "Who is PM of India?"
result = llm.invoke(query)
print(result.content)

Run this and you will get something like: "The current Prime Minister of India is Narendra Modi..."

query = "What is the temperature in Indore?"
result = llm.invoke(query)
print(result.content)

And you will get something like: "I am unable to provide real time information."

See the problem? The LLM cant give you real time data because it has no access to the internet. It can only answer from whatever it was trained on.

from dotenv import load_dotenv
load_dotenv()

from langchain_groq import ChatGroq
from langchain_community.utilities import GoogleSerperAPIWrapper
from langchain.agents import create_agent

# Setup search tool
search = GoogleSerperAPIWrapper()

# Setup LLM
llm = ChatGroq(model="llama-3.3-70b-versatile")

# Define tools (list because agent can have multiple tools)
tools = [search.run]

# System prompt tells the agent how to behave
system_prompt = "You are a assistant and can search on google for user queries."

# Create the agent
agent = create_agent(
    model=llm,
    tools=tools,
    system_prompt=system_prompt
)

# Chat loop
while True:
    query = input("User: ")
    if query == "quit":
        break

    response = agent.invoke({"messages": [
        {"role": "user", "content": query}
    ]})

    answer = response["messages"][-1].content
    print("AI:", answer)

Thats it. Seriously, thats the whole thing.

from dotenv import load_dotenv
load_dotenv()

This loads our API keys from the .env file so our code can use them.

This creates an object that can search Google using the SerPerAPI. The 

 method on this object is what actually performs the search.

llm = ChatGroq(model="llama-3.3-70b-versatile")

We are using Llama 3.3 70B model through Groq. You can use any other model available on Groq too.

We put our tools in a list because an agent can connect to multiple tools at once. Right now we only have one (Google Search), but you can add more like a database tool, weather tool, whatever you need.

system_prompt = "You are a assistant and can search on google for user queries."

This tells the agent what its role is and how it should behave. You can customize this however you want. Like "You are a 7 year Python developer" or "You are a comedian" and the responses will change accordingly.

agent = create_agent(
    model=llm,
    tools=tools,
    system_prompt=system_prompt
)

This is where the magic happens. We pass three things - the LLM model, the tools, and the system prompt. And LangChain creates our agent.

response = agent.invoke({"messages": [
    {"role": "user", "content": query}
]})

Notice that when we call a normal LLM, we just pass the query directly. But when we call an agent, we need to pass it in a structured format. A dictionary with "messages" key containing a list of message dictionaries. Each message has a "role" (who is sending it) and "content" (the actual message).

answer = response["messages"][-1].content

The response contains a list of messages. The last message in the list is our final answer. We grab its content and print it.

How I Built a Google Search AI Agent Using Python, LangChain and Free LLMs

we build a complete Google Search AI Agent from scratch using Python, LangChain framework, and Groq's free LLM APIs. First, we understand the difference between normal LLMs and AI Agents — why LLMs alone can't access the internet, databases, or perform real-world tasks, and how connecting tools to LLMs turns them into powerful AI Agents.

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        <div class="mb-n5px">
          <span class="content-temp-title">
            Installation and Setup For React JS and Next JS
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">2 Days</span></div>
      </div>
    </div>

<style>
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        <div class="mb-n5px">
          <span class="content-temp-title">
            Mastering React.js: Building Dynamic User Interfaces
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">1.5 Months</span></div>
      </div>
    </div>

<style>
        /* Title Style  */
        .content-temp-title-side-text {
            margin-right: 10px;
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            justify-content: center;
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        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
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        .content-temp-title {
            color: #006d77;
            font-weight: 900;
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    <div class="d-flex align-items-center">
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            Next.js - Taking Web Development to the Next Level
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">1 Month</span></div>
      </div>
    </div>

<style>
        /* Title Style  */
        .content-temp-title-side-text {
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            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
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        .content-temp-title {
            color: #006d77;
            font-weight: 900;
            line-height: normal;
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    <div class="d-flex align-items-center">
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        <img
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          src="https://seeklogo.com/images/N/nodejs-logo-FBE122E377-seeklogo.com.png"
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        <div class="mb-n5px">
          <span class="content-temp-title">
            Bringing it All Together: Full Stack Development
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">1 Month</span></div>
      </div>
    </div>

<style>
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        .content-temp-title-side-text {
            margin-right: 10px;
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            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 16px;
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        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
        }

        .content-temp-title {
            color: #006d77;
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            line-height: normal;
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    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
        
        <img
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          <span class="content-temp-title">
            Real-World Project Ideas to Ignite Your Creativity!
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">1 Month</span></div>
      </div>
    </div>

 <div class="mb-20px">  </div>

 <span class = "mt-10"><strong>Learn the MERN Stack,</strong> and build dynamic web applications using MongoDB, Express.Js, React.Js, Next.Js, and Node.Js. </span>

Integrate third-party APIs like Payment Gateway, Email, OAuth, and more.

Learn about deploying MERN applications on different cloud providers like AWS, DigitalOcean and others

Get an Internship Certificate.

Get One Year Membership with TechSim+

Full Stack Development Course In Jabalpur | TechSimPlus

Best MERN Stack Training Institute | TechSimPlus

MERN Stack Development Course | TechSimPlus

Full Stack Development with NodeJS & React JS | TechSimPlus

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MERN Stack Development Course in Indore | TechSimPlus

MERN Stack Development Course in Bhopal | TechSimPlus

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Full Stack Development with Node, React, Express and MongoDB

Master Full Stack Development: NodeJS, ReactJS, ExpressJS & MongoDB Course

UI Engineer

ReactJS Developer

<span class="color-green-900 text-heading-6">Unleash the Power of Full Stack Development with NodeJS, ReactJS, ExpressJS & MongoDB at TechSim+!</span>
<br/></br/>
Experience the power of full-stack development with the highly popular <strong class = "small-text-1"> MERN stack </strong>.
<br/>
 MERN, an acronym for <strong class = "small-text-1"> MongoDB, Express.js, React.js, and Node.js </strong>, enables you to create exceptional web applications. <br/>This course goes beyond the basics, covering advanced topics such as <strong class = "small-text-1"> file upload, authentication, authorization, and diverse deployment methods</strong>.

Full Stack Development with Node, React, Express & MongoDB ; MERN

Join TechSim+ and Build Full Stack Application from Scratch with MongoDB, Express, React and NodeJS

MERN Stack Bootcamp: Learn Full-Stack Web Development with MongoDB, Express.js, React.js, Node.js

Master MERN Stack development and build modern, scalable web applications with TechSim+. Learn MongoDB, Express.js, React.js, and Node.js to create SEO-friendly websites that deliver exceptional user experiences. Boost your career prospects with our comprehensive course. Enroll now!

Mongoose

MongoDB

NodeJS

Express JS

NextJS

JavaScript

Mobile Application Development with React Native is a comprehensive course designed to provide students with a solid foundation in building mobile applications using the React Native framework. React Native is a popular JavaScript framework that enables developers to create <strong> cross-platform </strong> mobile applications using a single codebase.

FS-RN-001

FS-RN-002

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            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
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    <div class="d-flex align-items-center">
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          class="content-temp-title-image"
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            HTML, CSS and JS: Building the Foundation
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        <div><span class="color-gray-400 fs-12px">1.5 Week</span></div>
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<style>
        /* Title Style*/
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            margin-right: 10px;
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        .content-temp-title-image {
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        <div class="mb-n5px">
          <span class="content-temp-title">
            Installation and Setup For React JS
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">0.5 Week</span></div>
      </div>
    </div>

<style>
        /* Title Style */
        .content-temp-title-side-text {
            margin-right: 10px;
            background-color: #dbece5;
            color: white;
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            height: 30px;
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            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
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        .content-temp-title {
            color: #006d77;
            font-weight: 900;
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    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
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        <div class="mb-n5px">
          <span class="content-temp-title">
            React.js - Work on Core React JS
          </span>
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        <div><span class="color-gray-400 fs-12px">2.5 Weeks</span></div>
      </div>
    </div>

<style>
        /* Title Style  */
        .content-temp-title-side-text {
            margin-right: 10px;
            background-color: #dbece5;
            color: white;
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            height: 30px;
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            justify-content: center;
            align-items: center;
            font-size: 16px;
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        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
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        .content-temp-title {
            color: #006d77;
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    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
        
        <img
          class="content-temp-title-image"
          src="https://seeklogo.com/images/N/nodejs-logo-FBE122E377-seeklogo.com.png"
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        <div class="mb-n5px">
          <span class="content-temp-title">
            Installation of React Native & First "Hello TechSimPlus" app.
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">0.5 Weeks</span></div>
      </div>
    </div>

<style>
        /* Title Style */
        .content-temp-title-side-text {
            margin-right: 10px;
            background-color: #dbece5;
            color: white;
            width: 30px;
            height: 30px;
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            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
        }

        .content-temp-title {
            color: #006d77;
            font-weight: 900;
            line-height: normal;
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    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
        <img
          class="content-temp-title-image"
          src="https://seeklogo.com/images/N/nodejs-logo-FBE122E377-seeklogo.com.png"
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      </div>
      <div class="d-flex flex-direction-column">
        
        <div class="mb-n5px">
          <span class="content-temp-title">
            React Native - Fundamental Concepts
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">2 Weeks</span></div>
      </div>
    </div>

<style>
        /* Title Style  */
        .content-temp-title-side-text {
            margin-right: 10px;
            background-color: #dbece5;
            color: white;
            width: 30px;
            height: 30px;
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            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
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        .content-temp-title {
            color: #006d77;
            font-weight: 900;
            line-height: normal;
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    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
        
        <img
          class="content-temp-title-image"
          src="https://seeklogo.com/images/N/nodejs-logo-FBE122E377-seeklogo.com.png"
        />
      </div>
      <div class="d-flex flex-direction-column">
        
        <div class="mb-n5px">
          <span class="content-temp-title">
            React Native - Advanced Concepts
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">2 Weeks</span></div>
      </div>
    </div>

<style>
        /* Title Style  */
        .content-temp-title-side-text {
            margin-right: 10px;
            background-color: #dbece5;
            color: white;
            width: 30px;
            height: 30px;
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            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
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        .content-temp-title {
            color: #006d77;
            font-weight: 900;
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    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
        
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          src="https://seeklogo.com/images/N/nodejs-logo-FBE122E377-seeklogo.com.png"
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          <span class="content-temp-title">
            Coding Made Exciting: Inspiring Projects
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">2 Weeks</span></div>
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<style>
        /* Title Style  */
        .content-temp-title-side-text {
            margin-right: 10px;
            background-color: #dbece5;
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 16px;
            padding: 5px;
        }

        .content-temp-title-image {
            width: 25px !important;
            height: 25px !important;
        }

        .content-temp-title {
            color: #006d77;
            font-weight: 900;
            line-height: normal;
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    </style>
    <div class="d-flex align-items-center">
      <div class="content-temp-title-side-text">
        
        <img
          class="content-temp-title-image"
          src="https://seeklogo.com/images/N/nodejs-logo-FBE122E377-seeklogo.com.png"
        />
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        <div class="mb-n5px">
          <span class="content-temp-title">
            Publishing Your React Native App on Play Store and App Store
          </span>
        </div>
        <div><span class="color-gray-400 fs-12px">0.5 Weeks</span></div>
      </div>
    </div>

Build Android & iOS Apps: Master Hooks, Redux, Navigation, Authentication, Payment & App Stores. Learn how to use ReactJS to build <strong> React native </strong> mobile apps for iOS and Android. Create Applications with <strong> Payment Gateway Integrations. </strong>

Explore React Native basics and advanced concepts.

Learn about deploying React Native applications to app stores.

Best React Native Training Institute In Jabalpur | TechSimPlus

Android & iOS Development with React Native | TechSimPlus

Best React Native Training Institute In Bhopal | TechSimPlus

Best React Native Training Institute | TechSimPlus

Best React Native Training Institute In Indore | TechSimPlus

Best React Native Course in India | TechSimPlus

React Native Training Online | TechSimPlus

Master React Native Mobile App Development: Beginner to Advanced Course | TechSim+

Mobile Developer

Android Developer

iOS Developer

React Native Developer

Ignite Your Future: Become a Master of Mobile Application Development with React Native!

<strong class = "small-text-1 color-green-900">Unlock the World of Mobile Application Development with React Native!</strong>
<br/><br/>
No matter your level of experience, our comprehensive course is designed to empower you with the skills and knowledge required to build powerful mobile applications using <strong class = "small-text-1"> React Native</strong>.
<br/><br/>
Immerse yourself in the foundations of React Native as we explore its core principles, compare <strong class = "small-text-1"> React Native CLI and Expo </strong>, and guide you through the setup of your local development environment.
<br/><br/>
Dive into the essentials of React and React Native, where you'll gain a deep understanding of <strong class = "small-text-1"> components, stylesheets, props, event handling </strong>, and the creation of essential UI elements like <strong class = "small-text-1"> buttons, text inputs, and icons</strong>. You'll also take a deep dive into React Hooks, mastering concepts such as <strong class = "small-text-1"> useState, useEffect, useRef, useContext </strong>, and even creating custom hooks.
<br/><br/>
We'll also explore advanced topics such as <strong class = "small-text-1"> debugging, data management with Redux, User authentication </strong>, building APIs with <strong class = "small-text-1"> NodeJS and Express </strong>, integrating payment systems using <strong class = "small-text-1"> PayUMoney</strong>, and deploying your applications to app stores.
<br/><br/>

Mobile (Android & iOS) Application Development with React Native

Unlock your potential in mobile app development with TechSim+'s comprehensive React Native course. From beginner to advanced, gain the skills and knowledge needed to build robust, cross-platform apps. Enroll now and embark on a transformative journey in mobile app development