What does HackerNews think of yubikey-agent?
yubikey-agent is a seamless ssh-agent for YubiKeys.
Thanks for those pointers!
It's not OpenSSH's weird FIDO mode, but I don't like the FIDO mode anyway because it requires storing a file on the computer.
That's exactly the use case I set out to replace for myself. I'll put together a guide at some point. The part I don't use and so can't really own is the mobile app, I would love a community solution there.
I am also planning to integrate https://github.com/FiloSottile/yubikey-agent which makes the SSH authentication part very easy, so that you only type your PIN once and it stays cached.
Getting minisign to sign using a key in a ubikey is not supported out of the box, but should be possible in the same way yubikey-agent works (after all, that's what it does when you authenticate an ssh session using a yubikey).
You can ask Filippo Valsorda.