MCP Tools Server

A Model Context Protocol (MCP) server providing 5 essential tools for weather information, calculations, currency conversion, timezone queries, and unit conversions.

Built with Python and FastMCP for AI Engineering applications.

🚀 Features

This MCP server provides the following tools:

1. Weather Tool

Retrieve current weather conditions for any city or location worldwide.

• Supports city names, ZIP codes, and "City,Country" format

• Returns temperature, humidity, wind speed, and weather description

• Uses OpenWeatherMap API

2. Calculator Tool

Perform basic arithmetic operations with proper error handling.

• Operations: addition, subtraction, multiplication, division

• Handles division by zero gracefully

• Returns formatted expressions

3. Currency Converter Tool

Convert amounts between different currencies using live exchange rates.

• Supports 150+ currencies

• Real-time exchange rates

• Uses ExchangeRate-API

4. Time Zone Tool

Get current time and timezone information for major cities.

• Supports 20+ major cities worldwide

• Returns current time, UTC offset, day of week

• Uses WorldTimeAPI (no API key required)

5. Unit Converter Tool

Convert between common units of measurement.

• Length: meters, kilometers, miles, feet, inches, yards, centimeters, millimeters

• Weight: kilograms, grams, pounds, ounces, tons

• Temperature: Celsius, Fahrenheit, Kelvin

Related MCP server: FastMCP Demo Server

📋 Prerequisites

• Python 3.11 or higher

• pip (Python package manager)

• API keys for:

  • OpenWeatherMap (free tier)

  • ExchangeRate-API (free tier)

🛠️ Installation

Step 1: Clone the Repository

git clone https://github.com/yourusername/mcp-tools-server.git
cd mcp-tools-server

Step 2: Create Virtual Environment

# Create virtual environment
python -m venv venv

# Activate virtual environment
# On Windows PowerShell:
.\venv\Scripts\Activate.ps1

# On Windows Command Prompt:
.\venv\Scripts\activate.bat

# On macOS/Linux:
source venv/bin/activate

Step 3: Install Dependencies

pip install -r requirements.txt

Step 4: Configure API Keys

1. Copy the .env.example file to .env:

   cp .env.example .env

2. Edit .env and add your API keys:

   OPENWEATHER_API_KEY=your_actual_api_key_here
   EXCHANGERATE_API_KEY=your_actual_api_key_here

🚀 Usage

Running the Server

python server.py

The server will start and be available for MCP client connections.

Connecting with Claude Desktop

1. Open your Claude Desktop configuration file:

   • Windows: %APPDATA%\Claude\claude_desktop_config.json

   • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

2. Add the server configuration:

   {
     "mcpServers": {
       "tools-server": {
         "command": "python",
         "args": ["C:/path/to/your/mcp-tools-server/server.py"],
         "env": {}
       }
     }
   }

3. Restart Claude Desktop

Using MCP Inspector

# Install MCP Inspector globally
npm install -g @modelcontextprotocol/inspector

# Run inspector with your server
mcp-inspector python server.py

📖 Tool Documentation

Weather Tool

Function: get_weather(location: str)

Description: Retrieves current weather conditions for a specified location.

Parameters:

• location (string): City name, ZIP code, or "City,Country" format

Example Request:

{
  "tool": "get_weather",
  "arguments": {
    "location": "London"
  }
}

Example Response:

{
  "location": "London",
  "country": "GB",
  "temperature": "12°C",
  "feels_like": "10°C",
  "description": "Scattered Clouds",
  "humidity": "76%",
  "wind_speed": "4.5 m/s",
  "status": "success"
}

Calculator Tool

Function: calculate(operation: str, num1: float, num2: float)

Description: Performs basic arithmetic operations.

Parameters:

• operation (string): One of "add", "subtract", "multiply", "divide"

• num1 (float): First number

• num2 (float): Second number

Example Request:

{
  "tool": "calculate",
  "arguments": {
    "operation": "multiply",
    "num1": 15,
    "num2": 4
  }
}

Example Response:

{
  "operation": "multiply",
  "num1": 15,
  "num2": 4,
  "result": 60,
  "expression": "15 multiply 4 = 60",
  "status": "success"
}

Currency Converter Tool

Function: convert_currency(amount: float, from_currency: str, to_currency: str)

Description: Converts an amount from one currency to another using live exchange rates.

Parameters:

• amount (float): Amount to convert

• from_currency (string): Source currency code (e.g., "USD", "EUR")

• to_currency (string): Target currency code

Example Request:

{
  "tool": "convert_currency",
  "arguments": {
    "amount": 100,
    "from_currency": "USD",
    "to_currency": "EUR"
  }
}

Example Response:

{
  "amount": 100,
  "from_currency": "USD",
  "to_currency": "EUR",
  "conversion_rate": 0.92,
  "converted_amount": 92.0,
  "formatted": "100 USD = 92.00 EUR",
  "last_updated": "Wed, 08 Jan 2025 00:00:01 +0000",
  "status": "success"
}

Time Zone Tool

Function: get_timezone_info(city: str)

Description: Gets current time and timezone information for a given city.

Parameters:

• city (string): City name (e.g., "Tokyo", "New York")

Supported Cities: London, Paris, New York, Los Angeles, Tokyo, Sydney, Dubai, Singapore, Mumbai, Toronto, Berlin, Moscow, Beijing, Hong Kong, Chicago, Mexico City, Sao Paulo, Cairo, Lagos, Johannesburg

Example Request:

{
  "tool": "get_timezone_info",
  "arguments": {
    "city": "Tokyo"
  }
}

Example Response:

{
  "city": "Tokyo",
  "timezone": "Asia/Tokyo",
  "current_time": "2026-01-10 15:30:45",
  "utc_offset": "+09:00",
  "day_of_week": "Saturday",
  "day_of_year": 10,
  "week_number": 2,
  "status": "success"
}

Unit Converter Tool

Function: convert_units(value: float, from_unit: str, to_unit: str, category: str)

Description: Converts between common units of measurement.

Parameters:

• value (float): Numeric value to convert

• from_unit (string): Source unit

• to_unit (string): Target unit

• category (string): One of "length", "weight", "temperature"

Example Request (Length):

{
  "tool": "convert_units",
  "arguments": {
    "value": 100,
    "from_unit": "km",
    "to_unit": "miles",
    "category": "length"
  }
}

Example Response:

{
  "value": 100,
  "from_unit": "km",
  "to_unit": "miles",
  "category": "length",
  "result": 62.1371,
  "formatted": "100 km = 62.1371 miles",
  "status": "success"
}

Example Request (Temperature):

{
  "tool": "convert_units",
  "arguments": {
    "value": 32,
    "from_unit": "fahrenheit",
    "to_unit": "celsius",
    "category": "temperature"
  }
}

Example Response:

{
  "value": 32,
  "from_unit": "fahrenheit",
  "to_unit": "celsius",
  "category": "temperature",
  "result": 0.0,
  "formatted": "32 fahrenheit = 0.0 celsius",
  "status": "success"
}

🧪 Testing

Manual Testing with MCP Inspector

1. Install MCP Inspector:

   npm install -g @modelcontextprotocol/inspector

2. Run the inspector:

   mcp-inspector python server.py

3. Test each tool through the inspector interface

Testing with Claude Desktop

1. Configure Claude Desktop (see Usage section)

2. In a conversation, ask Claude to use the tools:

   • "What's the weather in Paris?"

   • "Convert 100 USD to EUR"

   • "What time is it in Tokyo?"

   • "Calculate 25 multiplied by 4"

   • "Convert 100 kilometers to miles"

📁 Project Structure

mcp-tools-server/
│
├── server.py              # Main MCP server implementation
├── requirements.txt       # Python dependencies
├── .env                   # Environment variables (API keys) - not in git
├── .env.example          # Example environment file
├── .gitignore            # Git ignore file
├── README.md             # This file
└── venv/                 # Virtual environment (not in git)

🔒 Security Notes

• Never commit your .env file to Git

• The .gitignore file is configured to exclude sensitive files

• API keys are stored securely in environment variables

• All API requests include timeout protection

🐛 Error Handling

All tools include comprehensive error handling for:

• Invalid inputs

• Missing API keys

• Network failures

• API errors

• Division by zero (calculator)

• Invalid currency codes

• Unknown cities/locations

Errors are returned in a consistent format:

{
  "error": "Descriptive error message",
  "status": "error"
}

📝 Dependencies

• fastmcp - FastMCP framework for building MCP servers

• requests - HTTP library for API calls

• python-dotenv - Environment variable management

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is open source and available under the MIT License.

👤 Author

Your Name - Habeeb Temitope Lawal

🙏 Acknowledgments

• FastMCP framework

• OpenWeatherMap API

• ExchangeRate-API

• WorldTimeAPI