Your composer.lock checked against the Packagist advisories, with the vulnerable packages and the ones that have fallen behind, and an alert when something appears.
php artisan monitor:dependencies
A hole in a dependency does not show in your code. It is published on a Tuesday, it concerns a package you never chose but one of your dependencies pulls, and nothing in your application will behave differently to tell you.
One command sends the list of installed packages and their versions. No source is read and no file is uploaded.
Version constraints are compared with composer/semver, so a fixed version stops being reported without you closing anything.
The latest stable releases are compared with yours. A dev-main or RC install is never flagged: that is a choice, not an oversight.