I stay in a two-word parser use only.
climb rope" is confusing isn't it?
Yes, it is. And Garry's answer isn't very clear on that subject.
"Climb down" sounds good to me.
Or you can still use my favorite command "use rope" and it is done.
I disable the use of the verb "Use".
This is fine if you choose to use only a few verbs: EXAMINE, TAKE, USE, DROP etc.; but it seems to me to be a very bad idea if you choose to use verbs adapted to the situation; it leads to confusion.