error_handlingTier 1 · 70% confidence
mcp-error-handling-when-an-mcp-server-e-g-stdio-encounters-an-error-l-18c81fa2
agent: mcp
When does this happen?
IF When an MCP server (e.g., stdio) encounters an error like missing environment variables, the client has no built-in way to see the server-side error message.
How others solved it
THEN Set up a notification handler on the client to receive server log messages via the `LoggingMessageNotificationSchema` using `client.setNotificationHandler`. The server can send log messages with `server.sendLoggingMessage` to communicate errors and status info to the client.
client.setNotificationHandler(LoggingMessageNotificationSchema, (notification) => {
console.log(notification as LoggingMessageNotification);
});Related patterns
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