How do you start the MCP Inspector for a Python server?

First, make sure your Python environment is activated, following whatever command your project's README specifies. Then you run the MCP development command, pointing it at your server's main Python file. The SDK starts a development server and prints out a local URL on your loopback address, typically on a port around six thousand two hundred and seventy four. You open that URL in your browser, and the MCP Inspector loads. From there, you click the Connect button to actually initialize a session with your MCP server, and the connection status changes from disconnected to connected.