Either a conformation or having to type /clear inventory. At that point, if you type the command or confirm it, that’s on you.

 

I'd also suggest removing /clear, because it's similar to /fill clear. I've accidentally used /clear instead of /fill clear before, and I know other people have too.
/clearinventory would be very difficult to do accidentally, it's obvious what it does and I think it should be the only command to clear your inventory. If people really want to clear their entire inventory for some reason, they can take the extra half a second to type out /clearinventory instead of /ci or /clear. It would save people who might have accidentally used it a lot of trouble.

 

I will never remove clear inventory.
I will however try to add a confirmation to the command and all its aliases.

Added to our development to do list.

 

The /clearinventory command and all its aliases such as /clear now has a confirmation.
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