Human-In-the-Loop MCP Server is a powerful MCP server that enables AI assistants like Claude to interact with humans through intuitive GUI dialogs. It bridges automated AI processes and human decision-making by providing real-time user input tools, options, confirmations, and feedback mechanisms. The server supports non-blocking operation by running dialogs in separate threads to prevent blocking, and it enforces a configurable 5-minute timeout to avoid hangs. Available tools include get_user_input, get_user_choice, get_multiline_input, show_confirmation_dialog, show_info_message, and health_check. The GUI is cross-platform via tkinter, with a modern Windows-style interface, native macOS experience, and Ubuntu-friendly Linux styling. Platform detection, keyboard navigation, and comprehensive error handling contribute to a responsive and robust user experience. The MCP server is designed for workflows requiring human validation, user preferences, or detailed input before proceeding, and it can be integrated with Claude Desktop using claude_desktop_config.json. This server emphasizes real-time human feedback, clear status messages, and graceful recovery across Windows, macOS, and Linux environments.