Open-Pomodoro CLI is a command-line Pomodoro technique tracker built with Go and Cobra. It implements the Open Pomodoro Format for data storage, allowing users to start work sessions, take breaks, track completed pomodoros, view history, configure settings, and execute hooks at state transitions. The application features a modular architecture with separate packages for command handling (cmd/), output formatting (format/), and hook execution (hook/). It stores data in ~/.pomodoro/ as text files and supports multiple output formats including human-readable, JSON, and iCal. The tool integrates with tmux for status display and provides a comprehensive set of subcommands for managing the Pomodoro workflow.