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When you access an encrypted ssh private key in Mac OS X 10.11 “El Capitan” and earlier, Mac OS X prompts you to save its passphrase (encrypted) in the Apple keychain. From then on your private key will be automatically decrypted and available on request. When this is working, "ssh-add -l" should show at least one key available on your Mac or Linux system. After you "ssh -A" to another host with agent forwarding, "ssh-add -l" should show the same key(s) available as on your local desktop.
This is not default behavior in Mac OS 10.12 “Sierra”. To use the keychain in Sierra add “AddKeysToAgent yes” and “UseKeychain yes” to your config file (~/.ssh/config). Here is an example config file:
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