Your comment about the mysterious `-l` option got me interested and I did some investigation. It looks like a custom option added by Apple to indicate it was s

Your comment about the mysterious `-l` option got me interested and I did some investigation. It looks like a custom option added by Apple to indicate it was started by `launchd`. Here's a link to the relevant patch on their opensource site: http://www.opensource.apple.com/source/OpenSSH/OpenSSH-95.1.5/patches/DVG-4748610+4897588_ssh-agent_via_launchd.patch http://www.opensource.apple.com/source/OpenSSH/OpenSSH-95.1....