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@slison It’s a quick way to run a search directly from your address bar without going to the website. I use it on my blog all the time. For example, if I search !blog kagi, my browser will take me to my blog, and run the search in my built-in search on the blog for Kagi posts.
Even more useful: running @blog kagi will run Kagi search (with all its features) narrowed down just to my domain. I can use it, for example, to summarize my own posts. You can do the same with any website you’d like.