There isn't an open source project linked in your post, so I'm confused as to whether you created one, or if it's just the mass-smssend.sh script. If you created one, then you should use the "development" tag and link it in the body of your post. As for the "task-development" tag; this is meant for project owners/maintainers looking for people who can solve a task (e.g. implementing a feature) for their open source project.

I would suggest you read this guide that was written by Utopian's current CTO. It describes how we review development contributions and what we like to see in them - it should provide some useful information!