I am trying to pass the UUID or name of the current history to a script as part of a tool XML wrapper.  I was hoping some substitution like ${output.hid}, ${history_id} or similar would give this, but have not had luck.  Is there an approach to do this?

On a related note: does anyone have debugging tips or pointers to code that would help me figure out which substitutions galaxy will support?  The tool wrapper docs list some; however, this isnt complete.

Thanks in advance,

Ben