You build the archive:

ouch compress * archive.tar.gz

If you go there and run it again:

ouch compress * archive.tar.gz

It will ask "do you wish to overwrite archive.tar.gz?

If you press Y, it will delete the file, open a new file for archive.tar.gz, but note that the same file was also passed as an input for this compression! (with * wildcard)

The same file is the input and output.

ouch will read the output file to add as input to the... same output file.

Also:

ouch compress LICENSE a.zip

Then

ouch compress a.zip a.zip a.zip a.zip

Maybe just adding a FinalError for when the output file was passed as input too would solve it.