MediaWiki:VectorPlus.js

$(function(){
    // Check if the elements exist
    if (!$('#t-whatlinkshere').length || !$('#t-recentchanges').length || !$('#t-permalink').length || !$('#t-info').length) {
        return;
    }

    // Create a dropdown menu for the tools
    $('<div id="p-custom-tools" class="vector-menu vector-menu-dropdown">').append(
        $('<h3>').text('Tools'),
        $('<div class="menu">').append(
            $('#t-whatlinkshere, #t-recentchanges, #t-permalink, #t-info')
        )
    ).insertAfter('#ca-history');
})