# 🧠 MCP Server with LangChain and AI Tools

This project demonstrates how to build a **multi-tool AI assistant** using the **Model Context Protocol (MCP)**, LangChain, and Groq’s Qwen model. It includes:

- 📐 A local **Math MCP Server**
- 🌤️ A simulated **Weather MCP Server**
- 🤖 A conversational **AI agent** (MCP client) that talks to both

---

## 🧰 Features

- Uses **LangChain MCP Adapters** to connect tools
- Powered by **Groq's Qwen LLM**
- Handles local and remote tool servers via MCP
- Interactive CLI chat with tool usage detection

---

## 🏁 Prerequisites

- Python >= 3.11
- `uv` for project/environment management (https://github.com/astral-sh/uv)
- Internet connection for loading LLM (Groq)

---

## ⚙️ Setup Instructions

### 1. Create Project

```bash
mkdir mcp_project
cd mcp_project
uv init
```
Set Python version in .python-version and pyproject.toml to >=3.11

### 2. Create Virtual Environment
```bash
uv venv
source .venv/Scripts/activate
```
### 3. Add Dependencies
```
Create a requirements.txt file:
langchain-mcp-adapters
langchain-groq
langgraph
mcp
```
Install them
```bash
uv add -r requirements.txt
```
### Project Structure

mcp_project/
│
├── math_server.py       # MCP server for math tools
├── weather_server.py    # MCP server for weather API simulation
├── client.py            # MCP client with AI agent
├── requirements.txt
├── .python-version
└── .env                 # For storing Groq API key (GROQ_API_KEY)

## How to Run

### 1. Run the Weather Server
```bash
python weather_server.py
```
### 2. Run the Client (Automatically runs math server as sub process)
```bash
python client.py
```

##  Example Conversation
```text
You: What is the output of 2*3/(4-2)
AI: The result is 3.0

You: What is the weather in New York?
AI: The current weather in New York is sunny.

You: thanks
AI: You're welcome! 😊
```
##  Note
#### The weather server is simulated. Replace it with real API logic if needed.
#### You can add more MCP servers for documents, search, DBs, etc.
#### Use .env to store your GROQ_API_KEY.