* **Automatic, based on tool URL** - The best tool configuration is selected automatically. If the tool URL is not recognised, the tool configuration details may need to be entered manually.
* **A specific preconfigured tool** - The tool configuration for the specified tool will be used when communicating with the external tool provider. If the tool URL does not appear to belong to the tool provider, a warning will be shown. It is not always necessary to enter a tool URL.
* **Custom configuration** - A consumer key and shared secret may need to be entered manually. The consumer key and shared secret may be obtained from the tool provider. However, not all tools require a consumer key and shared secret, in which case the fields may be left blank.

### Preconfigured tool editing

Three icons are available after the preconfigured tool drop-down menu:

* **Add** - Create a course level tool configuration. All External tool instances in this course may use the tool configuration.
* **Edit** - Select a course level tool from the drop-down menu, then click this icon. The details of the tool configuration may be edited.
* **Delete** - Remove the selected course level tool.