Use this skill when the user's intent is to execute a system or plugin function. Applicable scenarios include: 1) The user sends a slash command starting with / (e.g. /cookiecloud, /sites, /subscribes, etc.); 2) The user describes an action in natural language that can be fulfilled by a system or plugin command (e.g. "sync sites", "show subscriptions", "refresh subscriptions", "check downloads", etc.). This skill helps you identify the user's intent, find the matching command, extract necessary parameters, and execute the corresponding command.