I'm building something similar. See my comment the OP above:

https://threadwise.app

If you want to get ahead of the curve, look into the Agent-to-Agent protocol Google just introduced. I'm currently using my own custom AI agent assistant to perform life tasks. If I could integrate a better tooling/agents into my own assistant system like your's that'd be awesome.

It's kind of like sure, I could manage my own emails, or I could offset this to someone who does it better. If you do it better and it's affordable, I'm in.

We are on that starship to the future right now and I love it.