You can see and try it here:
They currently support FastGPT and Universal Summarizer.
As the README suggests, you can install the CLI binary with cargo install kagi-cli.
I still perform Kagi searches in my browser, since the API requires an invitation, but also because the front page is so nicely made. I use FastGPT for my searches more and more, and I use the CLI here. I probably want a better graphical front-end at some point.
