The "Create a new Tool" link at https://tools.wmflabs.org/ gives a 404 error.

Please change line 33 of https://phabricator.wikimedia.org/F28662008 from:
<li><a href="https://toolsadmin.wikimedia.org/tools/create/">Create a new Tool</a></li>
to:
<li><a href="https://toolsadmin.wikimedia.org/tools/create">Create a new Tool</a></li>