I am by no means an expert on the matter but after some digging around (this was useful) it looks like the 'cl' command is the termcap command which only a GNU tput program will accept.
I think it should use the longname (which GNU tput also accepts) to have the widest compatibility.
After login it tries to clear the terminal: https://github.com/yardnsm/tmux-1password/blob/master/scripts/main.sh#L39
I am by no means an expert on the matter but after some digging around (this was useful) it looks like the 'cl' command is the termcap command which only a GNU tput program will accept.
I think it should use the longname (which GNU tput also accepts) to have the widest compatibility.