I build one, an inhouse one for myself. I think it's a worth doing and see if it works for you. Especially for someone who works independently most of the time. I get it to follow and support my working style, workflow and idiosyncrasies. I started out because I wanted something that queues my work serially for each project so I can work on main and I can type what I want to do in it instead of writing to an ever-growing TODO list.

I then make it show icons and indicators for blockers, ready sessions that need attention, TODO lists that include notifications and actions (because it's so easy to miss things while working on/with many sessions). Shows costs (loop coordinator and non-LC costs, by day, etc) so I can optimize costs.

It's fun, a learning experience and it's more productive. With excellent SOTA and coding agents now, we should be building tools to improve our work even more than before. Try it.