Claude's Fable 5.1 prompt changes show a moving target, a writer argues

A writer’s comparison of Claude’s Fable 5.1 system prompt argues that changing instructions reveal product design decisions. The author partly blames earlier guidance against bullets for prose that reads like lists compressed into dense paragraphs. They say the updated prompt relaxes that rule and explains its rationale: bullets make Claude feel less personal and friendly. The analysis also describes an instruction targeting overuse of “honestly” as a system-prompt “hot fix.”