Comment by burkaman

In this demonstration they use a .docx with prompt injection hidden in an unreadable font size, but in the real world that would probably be unnecessary. You could upload a plain Markdown file somewhere and tell people it has a skill that will teach Claude how to negotiate their mortgage rate and plenty of people would download and use it without ever opening and reading the file. If anything you might be more successful this way, because a .md file feel less suspicious than a .docx.