Use TouchID to Authenticate Sudo on macOS
Not exactly connected but the same crowd interested in this topic may also be interested in this tool to store SSH private keys in the Secure Enclave, kind of like what can be done with a YubiKey:https://github.com/maxgoedjen/secretiveI've been looking for something like this for 3-4 years but only found it six months ago (in an HN thread).  I use separate keys for every use case, and now know every time a key is used for any purpose, whether it's connecting to source control or my text editor is connecting to a remote VM.Only thing I haven't figured out is how to do git signatures with these sorts of keys, but I haven't debugged it at all.