for me when using .cursor/rules - no combination of USE ME ALWAYS or ALWAYS USE THIS FILE or whatever int he mdc file is not reliable whatsoever. I have instead found that with Claude sonnet at least, if the rules .mcd file has a use command it will almost always get used. its also obvious whenever agent uses an .mdc file it will mention it in the chat. so something in the mdc ddscription field like Use this file when the command Foo! is entered - or whatever you want to use to start your chat threads with.
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