Ideally such a skill could be used on itself to self-verify. Of course it could itself contain some kind of backdoor. If the security check skill includes exceptions to pass it's own security checks, this ought to be called a Thompson vulnerability. Then to take it a step further, the idea of Thompson-completeness: a skill used in the creation of other skills that propagates a vulnerability.

https://en.wikipedia.org/wiki/Euclidean_rhythm

If I understand it right, Toussaint's 2005 paper showed that many common rhythms across world music can be generated by distributing beats as evenly as possible. Some of the patterns in this newer research are Euclidean, but the broader finding is that people have a natural affinity for small-integer-ratio rhythms generally. So this is empirical evidence of why these mathematically simple patterns (including Euclidean rhythms) show up across world music.