The ARIA Validate tool functions as a Model Context Protocol (MCP) server dedicated to ensuring the proper implementation of Accessible Rich Internet Applications (ARIA). It leverages the `aria-query` library to validate ARIA attributes and role properties, helping developers and content creators build more accessible web experiences. By integrating with an MCP client, users can ask natural language questions to check the validity of ARIA usage, inquire about valid attribute values, and list ARIA landmarks.