MacOS: Installed openssh via brew, how do I add keys to keychain?

I installed openssh via brew install openssh. I added the following to my .profile: export SSH_AUTH_SOCK="~/.ssh/agent.$HOST.sock" ssh-add -l 2>/dev/null >/dev/null if [ $? -ge 2 ]; then ssh-agent -a "$SSH_AUTH_SOCK" >/dev/null fi And then I have to do the following: ssh-add ~/.ssh/id_ecdsa_sk Enter passphrase for /Users/myuser/.ssh/id_ecdsa_sk: Identity added: /Users/myuser/.ssh/id_ecdsa_sk even though I have the following in my ~/.ssh/config: Host * IgnoreUnknown UseKeychain UseKeychain yes AddKeysToAgent yes IdentityFile ~/.ssh/id_ecdsa_sk (I had to add the IgnoreUnknown bit b/c the install from brew installs a version that breaks the UseKeychain bit.) But now: how do I wire it up so it adds the key to my keychain? Help appreciated!