It's possible that there is a character that is in your paramater that is causing the issue. I haven't used this script. Can you give an example of what your passing as paramater 4 and 5 as well as indicating where the script is cutting off?

You could also test for a length limit by passing a long stream of numbers.12345678901234567890...01234567890 (etc.)

Probably should have caught this on my own, but I went back and fine-tooth-combed it. The character limit seems to be in the JSS. I hadn't hard-coded the message into the script, I was using the parameter text boxes in the script tab of a policy. When you save the policy, it truncates the text to whatever the limit is (~280).

I just hard-coded the message into a copy of the script. Works fine. Will use that. Thanks.

That sounds rather close to 255 which is a magic number for some MYSQL variable/column limits.

Could you not use jamfHelper for this https://jamfnation.jamfsoftware.com/article.html?id=107 its far more customizable. It can be written as a script and uploaded to Casper Admin, then scoped to a smart group or you can just run it from Caper Remote. Type this into terminal to get a man page : /Library/Application Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -help