Ah, probably shouldn't have abbreviated there. "OS automation" meaning "operating system automation", as in scripted deployment and configuration of software, similar to Ansible, Puppet, Saltstack etc..

I've mostly been frustrated with how relatively little assistance these tools give you. Your IDE obviously won't tell you what values can be put into a given configuration slot, nor will it auto-complete the right values, if everything is written in goshdarn YAML.
And so, this has mostly been an exercise in creating such a framework in a strongly-typed language, with lots of compile-checks, and which allows you to quickly define own task (in the same language, you use to configure tasks).