The server inspector

MCP Server Debugging and Testing

• Purpose: The MCP Inspector (provided via the Python SDK) allows developers to test and debug MCP servers in real-time without needing to integrate them into a full application.
• Setup Process:
• Activate the required Python environment (refer to the readme for specific commands).
• Run the development command: mcp dev [filename] (e. g. , mcp dev mcpserver. py).
• The terminal will display the server's listening port (e. g. , port 6277) and a direct access address.
• MCP Inspector Usage:
• Access the server via the provided address in a web browser.
• The inspector is an active development tool, so the UI may change.
• Workflow:
• Click the "Connect" button to start the MCP server.
• Navigate to the "Tools" section.
• Select a specific tool to view its functionality.
• Use the right-hand panel to manually invoke the tool for testing.
• Testing Tools (Examples):
• Read Doc Contents: Input a Document ID (e. g. , "deposition. md") → Verify success by confirming the returned content matches the document.
• Edit Document: Input the Document ID and the "Old String" → Input the "New String" → Run the tool → Verify the change by running "Read Doc Contents" again.
• Key Takeaway: The MCP Inspector is a crucial tool for live development, enabling easy verification of server functionality during the implementation phase.

Takeaways

• The MCP Inspector (via Python SDK) enables real-time testing and debugging of MCP servers without requiring full application integration.
• Setup is initiated by running the command mcp dev [filename] to display the server's listening port and access address.
• Developers use the web browser interface to connect to the server and manually invoke specific tools from the "Tools" section for testing.
• Tools like "Read Doc Contents" and "Edit Document" allow verification by comparing input and output (e. g. , confirming returned content matches the source document).