The UrlAgent Scheduler Task Module is similar to the Sitecore built-in UrlAgent in web.config except that there is ability to define the Urls in Sitecore and ask Scheduler Task to execute them.
This is very helpful tool and it prevents Developers to do a web.config deployment just because they wanted to add a Url.
The Module is smart enough to understand Absolute vs Relative URLs and it works with Multi-Site Solution;-);
The Scheduler Task pointing to the Url Agent Setting.
You could create another Scheduler Task in a Multisite Solution and you could also create a new Url Agent Setting and point the new Scheduler Task to your new Url Agent Setting
Link to Sitecore Market Place
GitHub for Sitecore UrlAgent Scheduler Task Module