FastAPI MCP Server

A comprehensive FastAPI application with Model Context Protocol (MCP) server functionality, providing 21+ useful tools for mathematical operations, string manipulation, file handling, utilities, and web requests.

🎥 Demo Video

📺 Watch the Demo

Direct Video Link: FastAPI MCP Server Demo Video

Click the link above to watch the demonstration video showing all 21+ tools in action!

🎬 Video Preview

The demo showcases:

• ✅ Mathematical Operations - Addition, subtraction, multiplication, division, power, square root

• ✅ String Manipulation - Uppercase, lowercase, reverse, length operations

• ✅ File Operations - Reading, writing, and directory listing

• ✅ Utility Functions - Time, random numbers, UUID generation, hashing

• ✅ Web Utilities - URL validation and HTTP requests

• ✅ MCP Protocol - WebSocket communication and tool calling

📋 Download Instructions:

1. Click the video link above to view in GitHub

2. Right-click on the video → "Save video as" to download

3. Play locally for the best viewing experience

🔗 Alternative Hosting Options:

• YouTube - Best for public demos with embed preview

• Google Drive - Easy sharing and preview

• GitHub Releases - For downloadable files

• Vimeo - Professional video hosting

Related MCP server: Simple MCP Server

Features

🔢 Mathematical Operations

• add - Add two numbers together

• subtract - Subtract second number from first number

• multiply - Multiply two numbers

• divide - Divide first number by second number (with zero-division protection)

• power - Raise first number to the power of second number

• sqrt - Calculate square root of a number

📝 String Operations

• echo - Echo back the input text

• uppercase - Convert text to uppercase

• lowercase - Convert text to lowercase

• reverse_string - Reverse a string

• string_length - Get the length of a string

📁 File Operations

• read_file - Read contents of a file

• write_file - Write content to a file

• list_directory - List files and directories in a path

🛠️ Utility Functions

• get_time - Get current server time

• random_number - Generate a random number between min and max

• generate_uuid - Generate a random UUID

• hash_md5 - Generate MD5 hash of input text

• hash_sha256 - Generate SHA256 hash of input text

🌐 Web Utilities

• validate_url - Validate if a string is a valid URL

• make_request - Make an HTTP request to a URL

Installation

1. Clone the repository:

git clone https://github.com/moawizbinyamin/Fastapi-mcp-server-.git
cd Fastapi-mcp-server-

2. Create a virtual environment:

python -m venv venv

3. Activate the virtual environment:

# Windows
venv\Scripts\activate

# Linux/Mac
source venv/bin/activate

4. Install dependencies:

pip install -r requirements.txt

Usage

Running the Server

python main.py

The server will start on http://localhost:8000

Available Endpoints

• GET / - Root endpoint with server info

• GET /health - Health check endpoint

• GET /tools - List all available tools

• POST /tools/call - Call tools via HTTP

• WebSocket /mcp - MCP protocol endpoint

• GET /docs - FastAPI automatic documentation

Testing Tools via HTTP

List all tools:

curl http://localhost:8000/tools

Call a tool:

curl -X POST http://localhost:8000/tools/call \
  -H "Content-Type: application/json" \
  -d '{"name": "add", "arguments": {"a": 5, "b": 3}}'

Example: Mathematical operations on 2 and 4:

# Addition: 2 + 4 = 6
curl -X POST http://localhost:8000/tools/call \
  -H "Content-Type: application/json" \
  -d '{"name": "add", "arguments": {"a": 2, "b": 4}}'

# Subtraction: 2 - 4 = -2
curl -X POST http://localhost:8000/tools/call \
  -H "Content-Type: application/json" \
  -d '{"name": "subtract", "arguments": {"a": 2, "b": 4}}'

# Multiplication: 2 × 4 = 8
curl -X POST http://localhost:8000/tools/call \
  -H "Content-Type: application/json" \
  -d '{"name": "multiply", "arguments": {"a": 2, "b": 4}}'

# Division: 2 ÷ 4 = 0.5
curl -X POST http://localhost:8000/tools/call \
  -H "Content-Type: application/json" \
  -d '{"name": "divide", "arguments": {"a": 2, "b": 4}}'

# Power: 2^4 = 16
curl -X POST http://localhost:8000/tools/call \
  -H "Content-Type: application/json" \
  -d '{"name": "power", "arguments": {"base": 2, "exponent": 4}}'

MCP Protocol Support

This server implements the Model Context Protocol (MCP) specification, allowing it to be used with MCP-compatible clients. The WebSocket endpoint /mcp handles MCP protocol communication.

MCP Configuration

For use with MCP clients, configure your MCP client with:

{
  "mcpServers": {
    "fastapi-mcp-server": {
      "command": "python",
      "args": ["main.py"],
      "cwd": "/path/to/Fastapi-mcp-server-",
      "env": {
        "PYTHONPATH": "/path/to/Fastapi-mcp-server-"
      }
    }
  }
}

Dependencies

• FastAPI - Modern, fast web framework for building APIs

• Uvicorn - ASGI server implementation

• Pydantic - Data validation using Python type annotations

• httpx - HTTP client for making web requests

• websockets - WebSocket implementation

Error Handling

All tools include comprehensive error handling:

• Division by zero protection

• File not found handling

• Invalid input validation

• Network request error handling

Development

Project Structure

Fastapi-mcp-server-/
├── main.py              # Main FastAPI application
├── requirements.txt     # Python dependencies
├── README.md           # This file
├── .gitignore          # Git ignore rules
├── start_server.bat    # Windows startup script
└── start_server.sh     # Linux/Mac startup script

Adding New Tools

To add a new tool:

1. Add the tool definition to the tools dictionary in the MCPServer.__init__() method

2. Add the tool implementation to the call_tool() method

3. Test the tool via the HTTP endpoint

License

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

Contributing

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

Support

For support, please open an issue on the GitHub repository.