Tailscale on a phone, on a server, and then whatever you and your agent come up with. I had a web app I built to talk to it. One day I wanted to share files and I just told it to implement that feature.

I don't use much off the shelf anymore. It's too easy to make my own hyper customized versions.

what app do you use on your phone to communicate with yoir server? just a terminal emulator?