Does anyone have a simple listener script that updates the summary of a ticket?

[Chris P_]

I've tried 20 different ways to find a script example that can update the summary of an issue in any way and none seem to work?

Anyone got any examples of this?

Please no post-function examples, I need something more responsive, see below.

Some background:

I'm building a listener/behaviour tag team for handling auto-tagging (based on custom field selections) of issue summaries that will make managing issues off a flat list much easier. Think "[Crash] Blah Blah Blah" or "[Initiative Prefix] Epic Summary", the latter making it easier to search for related epics when creating tickets.

The idea is simply that a behaviour initializers will strip the tags off the summary during form create/edit and once done the listener will add them back if they don't exist.

JIRA Server 7.13.5

[Chris P_]

My guess is it has something to do with getting the listener authenticated to make the change, any ideas?