Fortunately, it does work with 1Password for SSH.

    Good "git" signature for [REDACTED] with ED25519 key SHA256:VqH020xxJ+XyDLBh99HuBjkdXye4xakUqE05dyDnZC8
    fac93bd4295e 2022-06-08 | Some further updates (HEAD -> main) [Austin Ziegler]

I can't make it work as it complains about the format of the signing key. Can you please share your setup? Thanks!

Sorry, I had missed this.

The format is

    [gpg]
      format = ssh

    [user]
      signingKey = key::SSH-PUBKEY

In my case, since I have an ssh-ed25519 key, it is

    [user]
      signingKey = key::ssh-ed25519 AAAAC…

You can pretty much copy the `.pub` key and paste it after `key::` (instructions like the ones at https://calebhearth.com/sign-git-with-ssh will show this without the `key::` prefix; according to the latest git documentation, the non-prefixed SSH key format is not preferred, as the `signingKey` value can be either a raw SSH public key, a GPG key ID, or a path to the signing key).

One thing of note that I haven’t checked to see if it matters. I have the matching `.pub` key in `~/.ssh`, but I don’t think that is making a difference.

I do remember having some struggles getting it sorted out at the very beginning, but I didn’t take very good notes of what different things I tried.

Thank you!

Afaik 1Password simply provides an ssh-agent. So I don‘t see why this should not work. If you set gits user.signingKey to your public key and have SSH_AUTH_SOCk point to 1password agent this should work. Do you have any details on why not?