# Install dependencies
cd mcp-server
pip install -r requirements.txt

# Test the server runs (Ctrl+C to stop)
PYTHONPATH=src python -m mcp_server.server

mcp-server/
├── src/mcp_server/
│   ├── server.py          # Main FastMCP server
│   ├── config.py          # Environment-based configuration
│   └── tools/
│       ├── __init__.py    # Tool registry
│       ├── echo_tool.py   # Example: basic echo tools
│       ├── datetime_tool.py  # Example: date/time utilities
│       └── file_tool.py   # Example: file operations
├── configs/               # Client configuration templates
└── requirements.txt

{
  "mcpServers": {
    "my-mcp-server": {
      "command": "python",
      "args": ["-m", "mcp_server.server"],
      "cwd": "/full/path/to/mcp-server",
      "env": {
        "PYTHONPATH": "/full/path/to/mcp-server/src",
        "MCP_ALLOWED_PATHS": "/Users/you/Documents"
      }
    }
  }
}

{
  "mcpServers": {
    "my-mcp-server": {
      "command": "python",
      "args": ["-m", "mcp_server.server"],
      "cwd": "${workspaceFolder}/mcp-server",
      "env": {
        "PYTHONPATH": "${workspaceFolder}/mcp-server/src",
        "MCP_ALLOWED_PATHS": "${workspaceFolder}"
      }
    }
  }
}

# src/mcp_server/tools/my_tool.py
from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from mcp.server.fastmcp import FastMCP
    from ..config import ServerConfig


def register(mcp: "FastMCP", config: "ServerConfig") -> None:
    """Register my tools with the server."""

    @mcp.tool()
    def my_function(param: str, count: int = 1) -> str:
        """
        Description shown to Claude.

        Args:
            param: What this parameter does
            count: Optional count with default

        Returns:
            What the tool returns
        """
        return f"Result: {param} x {count}"

def register_all_tools(mcp: "FastMCP", config: "ServerConfig") -> None:
    from . import echo_tool, datetime_tool, file_tool, my_tool  # Add import

    echo_tool.register(mcp, config)
    datetime_tool.register(mcp, config)
    file_tool.register(mcp, config)
    my_tool.register(mcp, config)  # Add registration