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# Not recommend
# clear key
ssh-add -K -d ~/.ssh/<key>
# add key
ssh-add -K ~/.ssh/<key>
# add script to automaticcally add key when login
curl -o ~/Library/LaunchAgents/ssh.add.a.plist https://raw.githubusercontent.com/jirsbek/SSH-keys-in-macOS-Sierra-keychain/master/ssh.add.a.plist

# Use this config instead
Host * (asterisk for all hosts or add specific host)
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile <key> (e.g. ~/.ssh/userKey)