The `sc_auth` trick was posted about a year ago, since macOS 26 Tahoe added the SSH related functions into the keychain.dylib.

> https://news.ycombinator.com/item?id=46025721

One of the problems I constantly face is that the SSH configuration is not portable when I use these esoteric things. Even with Secretive (which plugs a simple SSH socket), remote agent forwarding sometimes fail. (ie. Due to the old version on the server or configuration issue, or something else setting SSH_AUTH_SOCK...)

Moreover, it is not possible to drop these files into a file-sharing folder, like OneDrive or iCloudDrive or SMB share, and share them with many hosts at the same time. (Especially when different operating systems are involved...)

I found the hacker way simplest and easiest; put a basic Makefile with bunch of rules, have a "central" host/machine to distribute the keys and configuration from that point on...