php The CLI tool in this tutorial helps automate the process of generating expense reports for an application. It uses Symfony's CLI feature to scaffold and build the report generator, as well as send emails with attachments using Twilio SendGrid. The report generator can be customized to include specific expenses based on their status, and it can also be configured to send emails to specific recipients. Additionally, the tool can be automated using a cron job to run the report generation process daily at a specified time.