I have been trying to use Multi contexual Panel , and everything is working except that scripter tool never shows up for me as an option in Tools . I got UI agent all permission role and still not working !

If you have a script, from my experience so far, it is always visible and not a separate tool. All the tools sit to the right of the script, and there doesn't seem to be anyway to hide the script completely if there is one present, only to change how much space it takes up.

What is it you are trying to achieve?

Show the script? Which if set should show up regardless of tools selected (assuming you have the script setup to allow that media type, and it is set on queue or in flow)

Or hide the script? Don't set a script for the queue.