Updating getToolsURL in package 5.7 version

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I have a problem with tools files.

I have an ajax request on tool file "lajax_list_extra.php"
$AJAX_url = BASE_URL.Loader::helper('concrete/urls')->getToolsURL('ajax_list_extra.php','proevents');



but it return empty response. i just echo "hallow word";

my directory
---packages
       --proevent(pacakge name)
             --tools
                   --ajax_list_extra.php


how it working in 5.7 version or 8.5.2 version
Please help how to upgrade or any can give running example

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