I want to sync ServiceDesk Plus request with JIRA ticket. I thought i can use custom triggers to achieve that and i used it to keep the incident type in sync. 

How do i set criteria when the description is changed?

How do trigger some script when a note has been added?

Is it possible to have a custom trigger without criteria or a trigger based on some flag field (Yes/No) ? So that my custom script is always triggered when this static field is Yes.

Please help.