Lovelace card-tools is required

[Snipercaine]

I had to install Card-Tools to get this to work. I didn't see that requirement in your documentation.
https://github.com/thomasloven/lovelace-card-tools
Great idea btw! I search for entities all the time. This will save me hundreds of clicks by not going to the Entities page.

[KennethLavrsen]

I also ran into this issue. It is really needs to be added to the documentation