Don't run piston if it's been run within last X minute

#1

1) Give a description of the problem
First time poster here, apologize if I’m doing anything wrong. I’ve written quite a few pistons and have a general understanding of it, but can’t seem to be able to figure out a way to do this. I have a piston that gets run exclusively via external URL (HTTP request from Tasker), that contains no conditions, just actions. I’d like to add a condition so that those actions don’t get run IF the piston was executed within the last 5 minutes, regardless of how often Tasker calls the URL - i.e. If (piston didn’t run within last 5 minutes) then {do action}. Is that doable?

2) What is the expected behaviour?
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3) What is happening/not happening?
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#2

First thing that comes to mind is have one of the actions set a variable, say alreadyRan to true and then use that as one of the conditions. Another task is a 5 minute timer with Task Cancellation Policy set to Never so it will not get shut down when the piston gets executed again. When the 5 minute timer expires, another task sets your alreadyRan variable to false.

#3

Thanks so much! Task Cancellation Policy is new to me too so definitely learning something new!