Fable5 Mode

fable5-mode

English | 简体中文

Make Opus 4.8 — or any Claude model — work like Claude Fable 5. A
Claude Code skill plus guard hooks that give a
non-frontier model Fable-5-grade work discipline: plan-gate, self-verification,
and sub-agent routing, enforced mechanically.

The skill is invoked as fable-mode; its premise:
output quality = model capability × work discipline

Quickstart

The skill works on its own; step 2 is optional (it turns the discipline into
hard blocks). Claude replies in your language even though the skill is
authored in English.

Design intent & what it changes

Why it exists. Weaker models mostly don't fail by being dumb in the moment;
they fail by *process*: thinking while typing and changing their mind halfway,
declaring "looks right" without running anything, fanning work out with no
verification, and quietly stopping mid-task. Those are process failures, and
process is fixable with structure. Since the "discipline half" of frontier
output is model-independent, you can hand a cheaper model the *working habits* of
a stronger one and recover a real chunk of the gap — paying in orchestration
steps instead of a bigger model.

What you actually get.

- Thinking happens in the cheapest phase (a written plan gate), not mid-implementation.
- "Done" means an acceptance command passed — not "looks right."
- Critical output survives an adversarial *refute* pass before it ships.
- Context stays clean across long runs, via external SPEC/PROGRESS memory instead of a bloated transcript.
- The two rules models shirk most — *write a plan before fanning out* and *don't stop with unfinished work* — are enforced by hooks, not hope.
- It's honest about its ceiling: on a real capability wall (a long from-scratch derivation, holding a huge codebase at once, fine…