A 'call-with-temp-files' procedure might be useful. This would ensure
those files are deleted when no longer needed:

   (call-with-temp-files
     (lambda (file1 file2 file3)
       (generate file1)
       (transform file1 file2)
       (transform file2 file3)
       (parse file3))
     "file1"
     "file2"
     "file3") ; => result of (parse file3)

So "file1" and "file2" and "file3" would be fed into whatever template
the implementation is using to generate unique names.

I didn't check whether some implementation has this already. I'll start
the comprehensive survey soon based on the links collected in the other
thread.