The Svix CLI is a powerful tool for interacting with the Svix API, allowing developers to quickly send webhook messages, list applications, create endpoints, and more. To use the Svix CLI, developers must first authenticate their account by setting an authentication token in their environment variables. Once authenticated, they can create new applications, list existing ones, add endpoints, and send messages using a variety of commands. The Svix CLI is highly customizable, allowing developers to chain commands together with other tools to improve their workflow. With its ease of use and flexibility, the Svix CLI is an essential tool for any developer looking to integrate with the Svix API.