MCP Server for Things3

A robust MCP (Model Context Protocol) server providing comprehensive integration with Things3, allowing you to create, manage, and search tasks and projects through the MCP protocol. Features improved error handling, secure URL encoding, and enhanced AppleScript integration.

Features

• ✅ Create Projects: Create new projects in Things3 with full metadata support

• ✅ Create Todos: Create new to-dos with detailed properties including checklists, tags, and dates

• ✅ View Tasks: List tasks from inbox, today's list, or all projects

• ✅ Complete Tasks: Mark todos as completed by searching for their title

• ✅ Search Functionality: Search through all todos by title or content

• ✅ Robust Error Handling: Comprehensive validation and error recovery

• ✅ Secure URL Encoding: Proper handling of special characters and unicode

• ✅ AppleScript Integration: Safe, non-JSON string concatenation approach

Related MCP server: Coding Todo Server

Installation

Prerequisites

• macOS with Things3 installed

• Python 3.8+

• Things3 running (for real-time operations)

Install the Server

1. Clone this repository:

   git clone <repository-url> cd mcp-things3

2. Install using pip:

   pip install -e .

3. The server will be available as mcp-server-things3

Tools Available

View Operations

view-inbox

View all todos in the Things3 inbox.

• Parameters: None

• Returns: List of inbox todos with due dates and scheduling info

view-projects

View all projects in Things3.

• Parameters: None

• Returns: List of all projects with their titles

view-todos

View all todos in today's list.

• Parameters: None

• Returns: List of today's todos with metadata

Creation Operations

create-things3-project

Creates a new project in Things3.

• Required: title (string)

• Optional:

  • notes (string)

  • area (string)

  • when (string) - Date/time to start

  • deadline (string) - Due date

  • tags (array of strings)

Example:

create-things3-todo

Creates a new to-do in Things3.

• Required: title (string)

• Optional:

  • notes (string)

  • when (string) - Date/time to start

  • deadline (string) - Due date

  • checklist (array of strings)

  • tags (array of strings)

  • list (string) - Project or area to assign to

  • heading (string) - Group under this heading

Example:

Management Operations

complete-things3-todo

Mark a todo as completed by searching for its title.

• Required: title (string) - Title or partial title to search for

• Returns: Success/failure message

Example:

search-things3-todos

Search for todos by title or content.

• Required: query (string) - Search term

• Returns: List of matching todos with status and metadata

Example:

Integration with Claude

This MCP server is designed to work seamlessly with Claude AI. Once configured, you can use natural language to manage your Things3 tasks:

• "Create a project called 'Q1 Planning' with a deadline of March 31st"

• "Add a todo to review the budget with a checklist of tasks"

• "Show me all my tasks for today"

• "Mark the 'Call client' task as completed"

• "Search for all todos related to the website project"

Configuration

MCP Client Configuration

Add to your MCP client configuration (e.g., Claude Desktop config):

Things3 Setup

1. Ensure Things3 is installed and running

2. Grant necessary permissions when prompted for AppleScript access

3. The server will validate Things3 availability before operations

Architecture

Components

• server.py: Main MCP server implementation with tool definitions and handlers

• applescript_handler.py: Robust AppleScript integration with safe data parsing

• URL Encoding: Proper x-callback-url parameter encoding for special characters

• Error Handling: Comprehensive validation and graceful error recovery

Security Features

• Input Sanitization: All user inputs are properly escaped for AppleScript

• URL Encoding: Special characters and unicode properly handled in URLs

• Validation: Things3 availability checked before operations

• Error Recovery: Graceful handling of AppleScript and system errors

Development

Running Tests

Debugging

The server includes comprehensive logging. Set log level for debugging:

Contributing

1. Fork the repository

2. Create a feature branch

3. Add tests for new functionality

4. Ensure all tests pass

5. Submit a pull request

Troubleshooting

Common Issues

"Things3 is not available"

• Ensure Things3 is installed and running

• Grant AppleScript permissions when prompted

• Check Things3 is not in a permission-restricted mode

"Failed to execute AppleScript"

• Verify macOS security settings allow AppleScript

• Ensure Things3 has necessary accessibility permissions

• Try restarting Things3

URL encoding issues with special characters

• The server now properly handles unicode and special characters

• If issues persist, check the logs for specific URL construction errors

Performance Notes

• AppleScript operations may have slight delays

• Large todo lists (1000+ items) may take longer to search

• Consider using specific searches rather than broad queries for better performance

License

MIT License - see LICENSE file for details.

Changelog

v0.1.0

• Initial release with basic CRUD operations

• Comprehensive error handling and validation

• Secure URL encoding and AppleScript integration

• Search and completion functionality

• Robust data parsing without JSON string concatenation