Courtesan is a free Chrome extension developed by bricoi1.infoq. It falls under the category of Browsers and is a subcategory of Add-ons & Tools. This powerful tool is specifically designed for tracing and debugging applications created with the Kingly state machine library.

With Courtesan, developers can easily monitor the outputs and internals of their Kingly state machines. The extension offers a sleek and intuitive user interface that provides valuable insights into the behavior of the state machine. It allows users to track the events that pass through the machine and observe the computed outputs. Additionally, Courtesan displays the key steps of the machine computation, such as transition taking and guards evaluation. Users can also view the evolution of the state of the state machine, gaining a comprehensive understanding of its functioning.

Overall, Courtesan is an invaluable tool for developers working with Kingly state machines. Its user-friendly interface and comprehensive tracing capabilities make it a must-have for debugging and monitoring the behavior of state machines.