[Ask HN]: Is there any evidence for the efficacy of prompt engineering?

Hi HN,

I understand how mechanical prompts that shape the process or output, such as "list out the steps to do x, y, z" can lead to a better output.

I'm skeptical of techniques such as "roleplay as a world expert in X field", or "If you do this well, I will reward you with $200". Are there any articles or reviews of these approaches?