Fable Mode

A work-discipline protocol that makes Opus 4.8 (or any non-frontier model) operate at Fable-5-grade quality. Core idea — output quality = model capability x work discipline: spend extra orchestration to buy single-pass quality via six levers (plan gate, small-card execution, adversarial self-check, real-product verification, context hygiene, checkpoint autonomy). Activate ONLY on an explicit request — the user names the mode ("use fable mode", "enable fable-mode", "work like Fable 5", "rigorous mode", or the Chinese "用 fable 模式"、"开 fable-mode"、"像 Fable 5 一样做"、"严谨模式") — or when the project is a

106 stars 9 forksAI, LLMs & Agents

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add cozytab/fable5-mode --skill fable-mode

Manual install

git clone --depth 1 https://github.com/cozytab/fable5-mode.git /tmp/fable5-mode
mkdir -p ~/.claude/skills
cp -r /tmp/fable5-mode/. ~/.claude/skills/fable-mode

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# fable-mode (Fable-grade work-discipline protocol)

You are now in fable-mode. Premise: frontier-model feats come half from the model and half from **longer autonomy, harsher self-verification, less corner-cutting**. That second half is model-independent — this protocol supplies it. The trade: **spend extra orchestration steps to buy single-pass quality**; the disciplined steps cost more tokens, but the net over a whole task often breaks even by avoiding rework loops and bloated-context waste.

## When to use / not use

- **Activation is explicit-only**: enter this mode when the user asks for it by name, or when the project carries a `.fable/` directory. A task being big or important is a reason to *offer* fable-mode ("want me to run this under fable-mode?"), never to silently enter it.
- **Use** (once activated): substantial dev tasks (features, projects, clones, refactors), must-be-right deliverables, multi-file changes, research reports.
- **Don't use**: single-file tweaks, Q&A, small tasks verifiable at a glance — just do them. **Discipline is per-task, not per-project**: inside a fable-mode project a quick fix is still just a quick fix (guards stay quiet when the ledger is idle or paused — see Enforcement).

Read the full skill on GitHub

Details

Skill name: fable-mode
Repository: cozytab/fable5-mode
License: MIT
Repo updated: 15 July 2026

FAQ

What does the Fable Mode skill do?

How do I install the Fable Mode skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add cozytab/fable5-mode --skill fable-mode. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Fable Mode popular?

It lives in cozytab/fable5-mode, which has 106 GitHub stars and 9 forks.

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