Stealthed tools are tools which are available in your instance, but are hidden from non-admin users when they select which tools they want to use in a site. In order to add a stealthed tool to a site, the admin user needs to manually add the stealthed tool via the Sites tool.
Select the Sites tool from the Tool Menu of the Administration Workspace.
Use the Search function to find the site you want to modify.
Scroll down toward the bottom of the site editing screen and select the Add/Edit Pages button.
You will see a listing of pages, or tools, currently active in the Tool Menu of the site. Click New Page to add another tool to this list.
Enter a title for the stealthed tool. The title you enter here is what will appear in the Tool Menu of the site once it has been added. You may also select the radio button for yes or no to indicate whether this is a custom title, or the default tool title.