5104952239
* This fixes #188 * In App.tsx - import LoggingLevel from sdk - add [logLevel, setLogLevel] useState with value of type LoggingLevel initialized to "debug" - add useEffect that stores the new logLevel in localStorage as "logLevel" - added sendLogLevelRequest function that takes a level argument of type LoggingLevel and sends the appropriate request. It calls setLogLevel when done, to update the local UI - pass logLevel and sendLogLevelRequest to Sidebar component as props * In Sidebar.tsx - Import LoggingLevel and LoggingLevelSchema from sdk - add props and prop types for logLevel and sendLogLevelRequest and loggingSupported - add Select component populated with the enum values of LoggingLevelSchema, shown only if loggingSupported is true and connectionStatus is "connected" *
MCP Inspector
The MCP inspector is a developer tool for testing and debugging MCP servers.
Running the Inspector
From an MCP server repository
To inspect an MCP server implementation, there's no need to clone this repo. Instead, use npx. For example, if your server is built at build/index.js:
npx @modelcontextprotocol/inspector node build/index.js
You can pass both arguments and environment variables to your MCP server. Arguments are passed directly to your server, while environment variables can be set using the -e flag:
# Pass arguments only
npx @modelcontextprotocol/inspector build/index.js arg1 arg2
# Pass environment variables only
npx @modelcontextprotocol/inspector -e KEY=value -e KEY2=$VALUE2 node build/index.js
# Pass both environment variables and arguments
npx @modelcontextprotocol/inspector -e KEY=value -e KEY2=$VALUE2 node build/index.js arg1 arg2
# Use -- to separate inspector flags from server arguments
npx @modelcontextprotocol/inspector -e KEY=$VALUE -- node build/index.js -e server-flag
The inspector runs both a client UI (default port 5173) and an MCP proxy server (default port 3000). Open the client UI in your browser to use the inspector. You can customize the ports if needed:
CLIENT_PORT=8080 SERVER_PORT=9000 npx @modelcontextprotocol/inspector node build/index.js
For more details on ways to use the inspector, see the Inspector section of the MCP docs site. For help with debugging, see the Debugging guide.
Authentication
The inspector supports bearer token authentication for SSE connections. Enter your token in the UI when connecting to an MCP server, and it will be sent in the Authorization header.
From this repository
If you're working on the inspector itself:
Development mode:
npm run dev
Note for Windows users:
On Windows, use the following command instead:npm run dev:windows
Production mode:
npm run build
npm start
License
This project is licensed under the MIT License—see the LICENSE file for details.