cozytab

Fable-mode raises output quality of Opus 4.8 or any non-frontier model to Fable-5-grade by applying six levers: plan gate, small-card execution, adversarial self-check, real-product verification, context hygiene, and checkpoint autonomy. It trades extra orchestration for single-pass quality.

Engineers and practitioners running non-frontier models who need frontier-grade, single-pass results on quality-sensitive work. It suits users willing to spend extra orchestration effort in exchange for disciplined planning, self-verification, and clean context management.

It activates only on explicit request, such as 'use fable mode', 'work like Fable 5', 'rigorous mode', or the Chinese '严谨模式', or automatically when the project contains a .fable/ directory whose hooks handle arming. It never auto-triggers on task size or generic quality phrases.

No. It deliberately does not auto-trigger merely because a task is large, important, or quality-sensitive, nor on vague phrases like 'do it well'. If a task looks like it would benefit, the assistant asks the user whether to enable fable-mode instead of assuming.

You need a model session such as Opus 4.8 or another non-frontier model, plus either an explicit activation phrase or a project pre-armed with a .fable/ directory. No other dependencies are specified in the manifest.