mcp-notification-validat-mcp-server-sends-a-notification-with-an-unrecogniz-25bd0f23

THEN Ensure the server only emits notification methods defined in the MCP specification (e.g., 'notifications/message', 'notifications/cancelled', 'notifications/progress', etc.). If custom logging is needed, use the standard 'notifications/message' method with appropriate severity levels. Alternatively, extend the client SDK's ServerNotification model to accept additional methods.

// Instead of sending: { "method": "notifications/stderr", "params": { "content": "..." } }
// Send standard logging notification:
{ "method": "notifications/message", "params": { "level": "error", "data": "Error-level message" } }