Fable Prompt Pass adapts prompts for Claude Fable 5, highlighting three adaptation aspects and providing outputs including fit check, adapted prompt, and change rationale. It runs as a Claude Code plugin or project skill, with GitHub-based installation steps.
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What it is
An open-source Claude skill that adapts any prompt to fit Claude Fable 5 (claude-fable-5) without losing prompt relevance, context, or meaning. It addresses prompt-quality optimization, false-positive refusal reduction, and mechanical API fit.
How it works
The tool analyzes a given prompt and:
- rewrites structure and wording to match Fable prompting guidance (intent, de-prescribe over-specified steps, explicit boundaries, outcome-first output)
- clarifies legitimate intent to reduce false-positive refusals in classifier-adjacent domains
- flags Fable-incompatible request bits (budgets, prefill, sampling params) and 30-day retention rules
It outputs:
- Fit check — one-line verdict (e.g., ready as-is, optimize, clarify intent, reasoning-extraction rewrite, or decline)
- Adapted prompt — rewritten prompt ready to copy (omitted on decline)
- What changed & why — changes tied to specific Fable behavior
- API notes — included if input had API details
Getting started
Install options:
Claude Code — as a plugin
"This repo is a Claude Code plugin (.claude-plugin/plugin.json). Add it via a
plugin marketplace, or point Claude Code at this repo, then invoke the
fable-prompt-pass skill."
Claude Code — as a project skill
"Copy the skill into a project's skills directory:
mkdir -p .claude/skills
cp -r skills/fable-prompt-pass .claude/skills/
The skill auto-surfaces when you ask to adapt/optimize a prompt for Fable, or you can invoke it by name."
Cursor / other assistants
"Use skills/fable-prompt-pass/SKILL.md (plus the files in references/) as a
rule / custom prompt. The content is model-agnostic Markdown."
Recent releases
- none
Traction
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License
MIT