The SiYuan tool functions as a Model Context Protocol (MCP) server, bridging your SiYuan Note application with AI assistants like Claude Desktop and Cursor. It empowers these AI tools to perform extensive operations on your notes, including advanced searching by filename, content, or SQL queries, comprehensive document management (create, read, update, move), daily note support, and even snapshot management. By integrating your personal knowledge base with AI, it streamlines workflow and enhances productivity, allowing for natural language interaction with your SiYuan data.