Since Sierra, I got prompted for my ssh key password everytime. After digging a bit, it seems Apple just changes it recently.
On macOS, specifies whether the system should search for passphrases in the user’s keychain when attempting to use a particular key. When the passphrase is provided by the user, this option also specifies whether the passphrase should be stored into the keychain once it has been verified to be correct. The argument must be ‘yes’ or ‘no’. The default is ‘no’.
In order to fix this, you just have to enable
UseKeychain for every hosts by adding these lines into your
Host * AddKeysToAgent yes UseKeychain yes IdentityFile ~/.ssh/id_rsa
Alternatively, you can add
ssh-add -A into your