In addition to positive reinforcement on the style I wanted for output, I tried your suggestion to tell Claude Fable to think Claudese in its thoughts, and that

In addition to positive reinforcement on the style I wanted for output, I tried your suggestion to tell Claude Fable to think Claudese in its thoughts, and that sadly got the session immediately flagged as too risky for Fable to handle, suggesting I downgrade to Opus. Several tweaks still consistently flagged it until I removed the directive about its thinking. So I guess Anthropic wants zero mention of thoughts with Fable: they're worried about anything that remotely smells like distillation but only with Fable.