The Things3 MCP Server provides a dedicated MCP server that integrates Things3 on macOS with a comprehensive toolkit of 25 MCP tools. It enables AI assistants and other MCP clients to manage TODOs, projects, areas, and tags with full CRUD and workflow capabilities. The server offers complete task management capabilities, including creating, reading, updating, deleting, completing, and uncompleting tasks, along with full project and area lifecycle support and hierarchical tag management. Features include automatic tag creation when referenced in TODO or project operations, bulk operations for moving or updating multiple items, and intelligent error correction to fix common issues such as date conflicts or missing titles. A logbook search supports date-range filtering for reviewing completed work. Performance optimizations include connection pooling and AppleScript enhancements. Configuration relies on Things3 authorization tokens for update operations. The project is modular, with dedicated tool modules for todos, projects, areas, tags, bulk, logbook, and system, plus AppleScript templates and utilities for date handling and error correction, designed for developers integrating Things3 workflows via MCP.