This tool checks the availability of tools by Yours Truly; that is, it checks if the web service for these tools is running. If it is not (tool is "down"), please notify me through the usual channels; I will restart the relevant web service(s) ASAP, tough I may not see your message for some time. The underlying cause of this is the failure of Wikimedia Labs to properly restart the web service automatically. You may want to let them know that this should be solved.