Memorising things like filtype:pdf or site:pizza.gov works, but it would be nice that if I typed a : or @, Kagi would try to autocomplete or suggest these options.
I've found myself typing type:svg and then realising this is the wrong keyword. But there's nothing showing this. Not even an indicator above the search results. Something like this would be nice to see:

Or perhaps: squiggles!

text-decoration: red underline wavy;
This would be rather helpful in preventing user error, reduce time wasted on mistakes and make it easier for new users to pick up the use of these extra features