up(1) looks really cool, I think I'll add it to my toolbox.
It looks like up(1) and memo(1) have similar use cases (or goals). I'll give it a try to see if I can appreciate its ergonomics. I suspect memo(1) will remain my mainstay:
1. After executing a pipeline, I like to press the up arrow (heh) and edit. Surprisingly often I need to edit something that's *not* the last part, but somewhere in the middle. I find this cumbersome in default line editing mode, so I will often drop into my editor (^X^E) to edit the command.
2. Up seems to create a shell command after completion. Avoiding the creation of extra files was one of my goals for memo(1). I'm sure some smart zsh/bash integration could be made that just returns the completed command after completing.
If you pipe curl's output to it, you'll get a live playground where you can finesse the rest of your pipeline.