However, if I try to use any git commands, it does not attempt any keys from ssh-agent. I changed ~cmder\vendor\git-for-windows\etc\gitconfig so that sshCommand = ssh -v -A, to see verbose output.

At present, users can now use a password, personal access token (PAT), or an SSH key to access Git -- but the company intends to remove support for passwords later this year.

Here's a quick example of how to perform a GitHub SSH clone operation. In just five minutes, learn how to create SSH keys, configure them in GitHub and perform the GitHub clone with SSH keys in Git.