# fable-fable

Runs structured multi-agent workflows on Claude Fable 5.1 with staged execution and independent output verification.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 878
- Author: mrtooher
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/mrtooher/fable-mode/tree/HEAD/fable-fable/SKILL.md
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/skills/fable-fable

## What it does

The skill delegates task control to `@fable-orchestrator` running on the Fable 5.1 model. The orchestrator lacks file writing or editing tools. Because of that, it cannot modify files directly. Work gets split and passed down to `@fable-worker-sonnet` and `@fable-worker-haiku`, while `@fable-verifier` validates the output.

This setup focuses on reproducible logs and tracked assumptions. Benchmarks from 2026-09-02 show execution costs roughly 1.1x token volume and roughly 2x wall-clock duration. Accuracy deltas remained flat across 16 paired runs. Running this pipeline on single-pass tasks adds ceremony without technical benefit.

Your runtime must support subagents alongside the `model: "fable"` flag. Before presenting final work, the system runs a mandatory delivery check through `double-check`. The orchestrator retains Bash access to execute test commands. However, its prompt forbids file writes through shell calls.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill fable-fable -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/fable-fable/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/fable-fable/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill fable-fable -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/fable-fable/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill fable-fable -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/fable-fable/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install mrtooher/fable-mode fable-fable
```

2. **Manually: put the files in place**
- File: `.github/skills/fable-fable/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill fable-fable -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/mrtooher/fable-mode --path fable-fable
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/fable-fable/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill fable-fable -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/mrtooher/fable-mode/tree/HEAD/fable-fable/SKILL.md

## When to use it
- orchestrate multi-stage programming tasks without direct file editing by the planner
- route draft generation to lower-tier worker agents
- run isolated verification on all generated artifacts before user handoff
- maintain a traceable audit log across deep engineering sessions

## Example prompts
- Run this refactor on fable with deep work mode
- Stage this multi-file migration using fable on fable
- Execute task via fable-fable with full verification pipeline

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From the same set: [mrtooher/fable-mode](https://affpapa.org/en/nevibecode/by/mrtooher/fable-mode.md) — 6 cards

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md