[azalemeth]

Is the author a literal yak shaver, á la sheep-shearer, but for yaks? (Or is it perhaps another way of saying "I can't legally tell you what I do for a living"?)

[michaelt]

It's a reference to https://en.wiktionary.org/wiki/yak_shaving

The author is saying "Yes, I know I've built something that's not very useful here"

[azalemeth]

Thank you! I'd never heard that particular phrase before.

[djrogers]

https://en.wiktionary.org/wiki/yak_shaving