Limits
There are many limits in tagscript, and some more when you use Carl.
Loops
You will not have access to loops in any way, there are a few exceptions, but in general if you want to loop through values and edit them, that won’t be possible.
Examples of blocks that you can use that have loop-like features:
{replace} {join}
Tag Recursion
If you’re looking to save data through tag recursion by using tag add
sadly this will not work, you’ll get the following message
Accessing Other Users Data
You will only be able to access 2 different users when using tags, and you must ping at least one of them.