function sshtmp --description "Connect to an SSH host using a temporary, one-time key"
    if test (count $argv) -eq 0
        echo "Usage: sshtmp [user@]hostname"
        echo "Example: sshtmp sshtron.zachlatta.com"
        return 1
    end

    set -l destination $argv[1]

    set -l tmp_dir (mktemp -d)
    set -l key_path "$tmp_dir/id_ed25519"

    try
        ssh-keygen -t ed25519 -f "$key_path" -N "" -C "sshtmp temporary key for $destination" >/dev/null
        command ssh -i "$key_path" \
            -o IdentitiesOnly=yes \
            -o StrictHostKeyChecking=no \
            -o UserKnownHostsFile=/dev/null \
            $destination
    finally
        rm -rf "$tmp_dir"
    end
end