MCP Server

MCP Server

A Model Context Protocol (MCP) server implementation that provides various tools for AI agents and LLMs, including search capabilities powered by SearXNG and file system operations.

Features

• Web Search: Perform web searches with customizable parameters using SearXNG
• File System Operations: Read, write, and manage files with security controls
• Extensible Architecture: Add custom tools following the MCP protocol
• Docker Support: Easy deployment with Docker and docker-compose
• Command-line Interface: Simple management through CLI
• Resources and Prompts: Full MCP specification support for resources and prompts

Requirements

• Python 3.13 (required)
• MCP SDK ≥ 1.6.0
• UV package manager for dependency management
• Docker (optional, for containerized deployment)

Implementation Approaches

This project demonstrates two approaches to implementing MCP servers:

1. FastMCP Decorator Approach (Recommended)

The simplified approach using FastMCP decorators in mcp_server/server.py:

from mcp.server.fastmcp import FastMCP

# Create server
mcp = FastMCP("MCP Server")

# Add a tool using decorator
@mcp.tool()
def search(query: str, num_results: int = 5) -> dict:
    """Search the web"""
    # Implementation...
    return results

# Add a resource
@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
    """Get a greeting"""
    return f"Hello, {name}!"

# Add a prompt
@mcp.prompt()
def search_prompt(query: str) -> str:
    """Create a search prompt"""
    return f"Please search for: {query}"

2. Original Architecture (Advanced)

The original architecture in mcp_server/core/ provides a more complex implementation with:

• ToolRegistry for managing tool registration
• MCPTool abstract base class for tool implementation
• Singleton MCPServer for server management

This approach offers more flexibility for complex applications but requires more boilerplate code.

Tools

search

Execute web searches through SearXNG with customizable filtering.

Inputs:

• query (string): Search terms
• num_results (number, optional): Number of results to return (default: 5, max: 20)
• language (string, optional): Language code for results (e.g., "en", "fr")
• time_range (string, optional): Time range for results (day, week, month, year)
• search_category (string, optional): Category to search in (general, images, news, videos)

filesystem

Read, write, and manage files with secure access controls.

Operations:

• Read File

  • path (string): Path to the file to read
  • encoding (string, optional): Encoding to use (default: "utf-8")
  • binary (boolean, optional): Whether to read in binary mode (default: false)

• Write File

  • path (string): Path to write the file
  • content (string): Content to write
  • encoding (string, optional): Encoding to use (default: "utf-8")
  • binary (boolean, optional): Whether to write in binary mode (default: false)
  • append (boolean, optional): Whether to append to file (default: false)

• List Files

  • path (string, optional): Directory to list (default: current directory)
  • recursive (boolean, optional): Whether to list recursively (default: false)
  • pattern (string, optional): Pattern to match filenames

Configuration

Environment Variables

Configure your MCP server using environment variables:

# Server settings
MCP_SERVER__HOST=0.0.0.0
MCP_SERVER__PORT=8000

# SearXNG settings
MCP_SEARXNG__INSTANCE_URL=http://localhost:8080
MCP_SEARXNG__TIMEOUT=5

# Logging settings
MCP_LOG__LEVEL=INFO

# Data directory
MCP_DATA_DIR=./data

Usage with Claude Desktop

Option 1: Install Simple Example Server

# Install the simple example server directly
mcp install examples/server.py

# Or test with the MCP Inspector
mcp dev examples/server.py

Option 2: Docker Configuration

Add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "mcp-server": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-p",
        "8000:8000",
        "-e",
        "MCP_SEARXNG__INSTANCE_URL=http://host.docker.internal:8080",
        "mcp-server"
      ]
    }
  }
}

You'll need to run a SearXNG instance separately:

{
  "mcpServers": {
    "searxng": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-p",
        "8080:8080",
        "-e", 
        "BASE_URL=http://localhost:8080/",
        "searxng/searxng"
      ]
    }
  }
}

Installation

Docker (Recommended)

# Build the Docker image
docker build -t mcp-server .

# Run the server and SearXNG
docker-compose up

Direct Installation

# Ensure you have Python 3.13 installed
python --version  # Should show Python 3.13.x

# Install uv if you don't have it
pip install uv

# Create a virtual environment and install dependencies
uv venv --python=python3.13
uv install

# Run the server
python -m mcp_server start

Client Examples

See the examples/ directory for client examples:

• examples/client.py: Modern client using ClientSession API
• examples/simple_client.py: Simple client using direct API calls

Extending with Custom Tools

Using the FastMCP Approach

from mcp_server.server import mcp

@mcp.tool()
def my_custom_tool(param1: str, param2: int = 10) -> dict:
    """My custom tool description"""
    # Implement tool functionality
    return {"result": f"Processed {param1} with {param2}"}

Using the Original Architecture

See the Developer Guide for instructions on adding custom tools with the original architecture.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgements

• Model Context Protocol for the protocol specification
• SearXNG for the search engine functionality

Command to run the project

python -m mcp_server start --config config.env