Sure. I clicked the docs demo URL[1] linked from the Sidekick page, then typed in the search box `what is Sidekick`, which returned the following:

> Kagi Sidekick is a helpful and cheerful assistant that assists users in finding the information they want on the Kagi website. It is a product feature backed by Kagi Search and large language models. Kagi Sidekick is currently in open beta and is only available to Ultimate plan members. <link to Kagi Assistant page>

The page it linked to was this[2], which stated similarly to the latter line above, except 'Sidekick' swapped to 'Assistant'. I had assumed from this that Sidekick had been renamed sometime recently or something.

> Kagi Assistant is currently in open beta only available to Ultimate plan members.

[1] https://help.kagi.com/kagi/

[2] https://help.kagi.com/kagi/ai/assistant.html