This is a great idea in theory but much harder to do properly in practice. The idea is only really worthwhile as long as you can really extend it to a lot of things(no one cares about adding an Nth tool that can do GitHub and jira and one more thing).. and that's where this is going to go wrong.
There are reasons the interfaces to many tools that we use are as complicated as they are - it's needed to use the tool to its full effect. In order to achieve the same effect in this tool, you are doomed to constantly reimplement literally the entire interfaces of all the interesting services, just as CLI interfaces.. and that's just not gonna scale.
I'm not into all this YC stuff, but does the YC20 in the title means that someone has funded this idea?