fable-domain

fable-domain is a skill for Claude Code, Codex from ardhaecosystem/fable-method. It costs 73 tokens per session (2,417 once invoked), scanned A, original, MIT.

A workflow for extending the Fable problem-solving method to a non-code field such as marketing, research, data analysis, or operations. It creates the field’s workflow, rules for judging evidence, test scenario, and a small verification run.

In plain words
What is it for?
Use it to create and check a domain adapter, including a process flow, evidence rules, a deliberately tricky test case, and a smoke evaluation.
Why use it?
It prevents a general coding-oriented process from applying the wrong terms, authorities, or evidence standards to another field.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to create and check a domain adapter, including a process flow, evidence rules, a deliberately tricky test case, and a smoke evaluation.

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Install with agentmods
npx agentmods add skills/ardhaecosystem/fable-method/fable-domain
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ardhaecosystem/fable-method --skill fable-domain
Clone the repo
git clone --depth 1 https://github.com/ardhaecosystem/fable-method

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fable-domain

README.md
[![agentmods](https://agentmods.dev/badge/skills/ardhaecosystem/fable-method/fable-domain/github.svg)](https://agentmods.dev/skills/ardhaecosystem/fable-method/fable-domain)
Your own site
<a href="https://agentmods.dev/skills/ardhaecosystem/fable-method/fable-domain"><img src="https://agentmods.dev/badge/skills/ardhaecosystem/fable-method/fable-domain/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fable-domain

Your own site · 80×15
<a href="https://agentmods.dev/skills/ardhaecosystem/fable-method/fable-domain"><img src="https://agentmods.dev/badge/skills/ardhaecosystem/fable-method/fable-domain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,417 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00073 $0.02417
Opus 5.5 $0.00029 $0.00967
Sonnet 5.5 $0.00015 $0.00483
Haiku 4.5 $0.00007 $0.00242

Measured 1mo ago against content hash acc7a8ee3b21, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fable-domain scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/software-development/fable-domain/SKILL.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

fable-domain

This skill extends the fable-method problem-solving loop to non-code sectors by producing a domain adapter bundle. A bundle is four deliverables that together let fable-loop/fable-judge run against a new domain with its own nouns, authorities, and evidence rules - instead of falling back to coding defaults.

Use when a user asks to "create a domain adapter for X", "extend fable to marketing/research/ops", or "build a trap fixture for sector Y".

What a bundle is

A bundle is all four of these, or it is not done:

  1. Domain workflow - ordered steps a practitioner follows in the sector, with a mermaid flowchart.
  2. Adapter - a file conforming to the adapter template (applies-when, minimum evidence set, evidence sources, authority order, verification by observation, fraud table, done-by-example, sources with fetched links).
  3. Trap fixture - an eval/scenarios/<scenario>/ directory with GROUND-TRUTH.md defining the task, the trap, scoring caps, and ideal behavior.
  4. Smoke eval - 1-2 control-vs-adapter runs judged by diff + execution, labeled smoke-grade: pass|fail|partial.

No bundle = no claim. Partial output (only adapter, only workflow) is rejected at Stage 4.

Process

flowchart TD
 A[Stage 1: Discuss] -->|red-line hit| R[Refuse + stop]
 A -->|scope stop: nouns == coding default| S[No adapter needed]
 A -->|approved scope| B[Stage 2: Research]
 B -->|no web access| STOP1[No trustworthy bundle, stop]
 B -->|evidence gathered| C[Stage 3: Generate]
 C -->|duplicate adapter exists| DUP[Merge or abort]
 C -->|4 deliverables written| D[Stage 4: Verify]
 D -->|smoke + judge pass| DONE[Bundle complete]
 D -->|smoke fail| FIX[Patch + re-verify]
 FIX --> C

 R -.-> END[End]
 S -.-> END
 STOP1 -.-> END
 DUP -.-> END
 DONE --> END[Report outcome-first]

Stage 1 - Discuss

Ask the user, in plain questions, before generating anything:

  • Use case: what task in this domain should the loop solve? One concrete example.
  • What good looks like: what does a correct answer look like? What does a wrong answer look like?
  • Trusted authorities: which orgs, standards, regulators, or practitioners does the user defer to?
  • Must-nevers: what outputs are unacceptable, illegal, or harmful?
  • Desired outputs: artifact shape - report, plan, checklist, data file, copy draft.

Read the full file on GitHub · 193 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 193 lines · 73 tokens per session scan A acc7a8ee3b21

Subscribe to this mod's changes

fable-domain is a skill published in the GitHub repository ardhaecosystem/fable-method (13 stars, last pushed 2mo ago), licensed MIT. It adds 73 tokens to every session and 2,417 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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