I'm using the jenkins-cli.jar file from my jenkins server, and on every run it prompts me for my ssh key passphrase. I'd like it to use my ssh keychain so I don't have to enter it on every invocation.
If it matters, I'm on OSX using the default keychain setup, I don't have a manual ssh-agent configured right now.
Jenkins CLI client does not support SSH agents for now.
As a workaround, you can generate dedicated key without passphrase, associate it with your Jenkins account and instruct client to use that key on every invocation.