[mmalone]

Recent macOS versions don't have `ssh-askpass`, and it's weirdly hard to add one. Since agent confirmation depends on askpass, I don't think there's an easy way to get this work on macOS.

Aside from the missing context you mentioned, the other bigger problem with this approach is that agent confirmation is all-or-nothing: it turns on confirmation for local SSH connections in addition to forwarded connections. If you're using SSH a lot, having to confirm every connection is very annoying.