Simon Willison on Claude Fable: relentlessly proactive

Claude Fable is relentlessly proactive

Simon Willison tried Anthropic's new Claude Fable mode and found it aggressively proactive. He asked it to build a SQLite utility; Fable not only wrote the code but also set up docs, tests, GitHub Actions, and a release pipeline without asking. Willison found the experience both impressive and unsettling. The post doesn't spell out Fable's technical implementation or rollout scope.

Why it matters: First-hand Fable test from a trusted dev voice, with the most concrete behavioral description yet. HKR all hit, but the post doesn't disclose technical implementation or rollout scope, capping it below 85.