Basically, it starts a SOCKS5 proxy in the background that will automatically handle connecting with holesail/hyperdht connections, you wont have to connect to a key every time in terminal, the proxy will automatically do it on the go for any app for browser.

For example, doing <my key>.hyper in the browser will load a holesail connection from <my-key> .

It is pretty sick,  nostr:npub1ye5ptcxfyyxl5vjvdjar2ua3f0hynkjzpx552mu5snj3qmx5pzjscpknpr I see it is MIT, I might add it to holesail someday