[launchd-dev] Obtaining the value of SSH_AUTH_SOCK in an entry?

Hi, I'm trying to set up an entry for launchd that will fire off ssh on-demand to create a tunnel. I would like for the ssh to get authentication information from ssh-agent, but I'm not sure if launchd children inherit SSH_AUTH_SOCK in the environment, or if I somehow have to designate that it gets it. In the pre-leopard days when I used SSHKeyChain.app, the SSH_AUTH_SOCK value was constant, and I could just set SSH_AUTH_SOCK in an <EnvironmentVariables> declaration in the entry. Thanks, -cj