ssh-agent(1) on macOS
The text b12590b63075, as macOS 13.5, macOS 13.4, macOS 13.3, macOS 13.2, macOS 13.1, macOS 13.0 shipped it.
OpenSSH authentication agent
Flags it lists
-
-D -
-E -
-P -
-a -
-c -
-d -
-k -
-s -
-t