[galaxy-user] temp files for workflows

Hi All, I'm fairly new to galaxy and trying to understand it from both a user and tool developer perspective. Does galaxy have a way to mark tool outputs within a workflow as temporary (ie they should be deleted after the workflow finishes running)? If not is there some way to facilitate this as a tool developer? It's pretty frequent for us to have workflows where the intermediate tool output is not important and we would rather have the disk space. Thank you Keith