ssh-add(1) on macOS
The text e2a773429c85, as macOS 11.5, macOS 11.4, macOS 11.3, macOS 11.2, macOS 11.1, macOS 11.0.1, macOS 10.15.6, macOS 10.15.5, macOS 10.15.4 shipped it.
adds private key identities to the authentication agent
Flags it lists
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-A -
-D -
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-X -
-c -
-d -
-e -
-k -
-l -
-q -
-s -
-t -
-v -
-x