FableCodex

Fable-style workflow guidance for Codex.

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FableCodex is a Codex plugin marketplace that brings Fable-style operating habits into Codex workflows.

It helps Codex work in a more structured way: inspect first, track goals, gather evidence, verify results, and report clearly.

This project does not clone, unlock, or replace the Fable 5 model.
It only provides workflow guidance, prompts, examples, coverage accounting, and optional routing docs.

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What It Does

• Adds a Fable-style, tool-first agent loop for coding and research tasks.
• Provides a simple goal ledger with evidence checkpoints.
• Encourages conclusion-first answers, clue-first debugging, and cheapest useful checks first.
• Adds an optional final verification gate before claiming success.
• Tracks CLAUDE-FABLE-5.md source-heading coverage with explicit Codex decisions.
• Documents an optional provider bridge for users with valid Anthropic access.

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Install

Use this repo directly as a local marketplace:

codex plugin marketplace add ~/Desktop/FableCodex
codex plugin add codex-fable5@fablecodex

Restart Codex after installing or updating the plugin.

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Use

In Codex:

Use $codex-fable5 to analyze this project.

$codex-fable5로 이 프로젝트를 분석해줘.

$codex-fable5 を使って、このプロジェクトを分析してください。

请使用 $codex-fable5 分析这个项目。

請使用 $codex-fable5 分析這個專案。

Create a simple multi-goal ledger:

python plugins/codex-fable5/skills/codex-fable5/scripts/codex_goals.py create --brief "Migration" \
  --goal "inspect::Find current behavior and tests" \
  --goal "change::Implement the migration" \
  --goal "verify::Run tests and inspect output"

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Measure Fable 5 Coverage

If you have a local copy of CLAUDE-FABLE-5.md, run:

python plugins/codex-fable5/skills/codex-fable5/scripts/fable_coverage.py \
  --source /path/to/CLAUDE-FABLE-5.md

The target is 100% source-heading accounting. That means every named source section has a Codex-native decision: implemented, adapted, unsupported, or not applicable. It does not mean model-weight parity or hidden Claude/Fable runtime parity.

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Test

Run the stdlib-only test suite:

python -m unittest discover -s tests -v

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Optional Provider Bridge

For model routing, read:

plugins/codex-fable5/skills/codex-fable5/references/provider-bridge.md

You need valid Anthropic access and a working OpenAI-compatible gateway such as LiteLLM.

This repo does not provide model access.

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Source Notes

This is a Codex-native adaptation inspired by:

• elder-plinius/CL4R1T4S ANTHROPIC/CLAUDE-FABLE-5.md at commit dc626fed52b06d687cdc812d51090c95ed03d575.
• fivetaku/fablize at commit 15912466994e71a234d18fe9c74b46a68fb6a07d.
• itsinseong/value-for-fable at commit 35a9bd27de961a49c343f41ac47c49114d51a328.

It paraphrases and adapts workflow ideas instead of reproducing the source prompts or documentation.

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License

AGPL-3.0-or-later. See LICENSE, NOTICE, and plugins/codex-fable5/skills/codex-fable5/references/provenance.md.