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Agent skill

Fable Advisor

by fcakyon in fcakyon/claude-codex-settings

This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor".

Apache-2.0Auto-check passed

Install Fable Advisor

skills CLI
$ npx skills add fcakyon/claude-codex-settings --skill fable-advisor -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install fcakyon/claude-codex-settings fable-advisor --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/fcakyon/claude-codex-settings.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/fable-advisor/skills/fable-advisor .claude/skills/fable-advisor && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
fable-advisor
GitHub stars
1.2k
Token cost
~262 tokens
SKILL.md length
112 words
Files
2 (incl. scripts)
Skills in repo
43
Repo updated
First seen
Licence
Apache-2.0

At a glance

This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor".

  • Works in 2 steps: In Claude Code, delegate to the native… → Elsewhere, run this exact shape from…
  • Asks for a Fable second opinion
  • Runs JavaScript scripts from its folder; calls node
  • Wants to check a plan before committing

What it does

Fable Advisor is an agent skill from fcakyon/claude-codex-settings. This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor".

Its SKILL.md is about 260 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts.

The repository describes itself as: Battle-tested Claude Code, OpenAI Codex, Cursor configs, plugins, hooks and agents with Kimi, MiniMax and GLM API support. The licence is Apache-2.0.

When your agent uses it

  • Asks for a Fable second opinion
  • Wants to check a plan before committing
  • Needs another view after repeated failures
  • Explicitly invokes fable-advisor

Example prompts

  • “Fable second opinion”
  • “check a plan before committing”
  • “fable-advisor”
  • “/fable-advisor”

Requirements

  • Node.js

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

  1. In Claude Code, delegate to the native fable-advisor agent. Do not launch
  2. Elsewhere, run this exact shape from this skill's directory so the request

What it can do on your machine

Read from SKILL.md and the folder at commit a035b4e. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (JavaScript), which the agent can run.

    Shell commands in SKILL.md call:

    • node

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Fable Advisor loads about 262 tokens when it runs. Until then it costs about 54 tokens; SKILL.md has 112 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~54
When it runs · the whole SKILL.md, loaded when a task matches
~262

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from fcakyon/claude-codex-settings at commit a035b4e, republished under its Apache-2.0 licence (© fcakyon). 112 words, ~262 tokens.

Download SKILL.mdSave it as .claude/skills/fable-advisor/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
fable-advisor
description
This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor".

Fable Advisor

Get a focused second opinion from Claude Fable 5.1 without substituting the host tool's model.

Route by tool

  1. In Claude Code, delegate to the native fable-advisor agent. Do not launch another Claude Code process.

  2. Elsewhere, run this exact shape from this skill's directory so the request reaches standard input:

    node scripts/ask_fable.mjs <<'REVIEW'
the review request
REVIEW

State the decision, the evidence behind it, and any constraint that changes the verdict. Name the paths that matter: the reviewer has read-only access and checks load-bearing claims itself.

Return Fable's answer without rewriting it. If claude is missing or unauthenticated, surface the error and ask the user to install it or sign in. Never review in its place.

© fcakyon, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (scripts) in plugins/fable-advisor/skills/fable-advisor of fcakyon/claude-codex-settings.

  • SKILL.md
  • scripts/ask_fable.mjs

Open the folder on GitHubat commit a035b4e

Compare with similar skills

Fable Advisor next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Fable Advisor compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Fable Advisor this skillfcakyon/claude-codex-settings1.2k—~262Automated safety check: PassApache-2.0
Fable Fablemrtooher/fable-mode870—~1.1kAutomated safety check: PassNone
Advisor Modecursor/plugins10k—~2.6kAutomated safety check: NotesNone
Odoo Upgrade Advisorsickn33/agentic-awesome-skills47k2 repos~1.3kAutomated safety check: PassMIT
Token Budget Advisoraffaan-m/ECC274k—~910Automated safety check: PassMIT
Token Budget Advisoraffaan-m/ECC274k—~927Automated safety check: PassMIT

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  • Advisor Mode

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    Adds a second, stronger model that the main agent consults before major decisions, when stuck and before finishing, controlled by /advisor commands.

    10k GitHub stars~2.6k tokensUpdated today
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    47k GitHub starsUsed in 2 repos~1.3k tokens
    DevelopmentAuto-check passed

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Questions about Fable Advisor

What does Fable Advisor do?

This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor". Fable Advisor is an agent skill from fcakyon/claude-codex-settings. This skill should be used when the user asks for a "Fable second opinion", wants to "check a plan before committing", needs another view after repeated failures, or explicitly invokes "fable-advisor".

When should I use Fable Advisor?

Fable Advisor fits situations like: asks for a Fable second opinion; wants to check a plan before committing; needs another view after repeated failures; explicitly invokes fable-advisor.

How do I install Fable Advisor in Claude Code?

Run `npx skills add fcakyon/claude-codex-settings --skill fable-advisor -a claude-code`. Or copy the skill folder (plugins/fable-advisor/skills/fable-advisor in fcakyon/claude-codex-settings) into .claude/skills/fable-advisor in your project. Claude Code loads it when a task matches its description.

How do I install Fable Advisor in Codex?

Run `npx skills add fcakyon/claude-codex-settings --skill fable-advisor -a codex`. Or copy the skill folder (plugins/fable-advisor/skills/fable-advisor in fcakyon/claude-codex-settings) into .agents/skills/fable-advisor in your project. Codex loads it when a task matches its description.

Can I use Fable Advisor in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add fcakyon/claude-codex-settings --skill fable-advisor -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fable-advisor, .gemini/skills/fable-advisor, .github/skills/fable-advisor and .opencode/skills/fable-advisor in your project.

What does Fable Advisor need to run?

Going by SKILL.md and its folder, Fable Advisor needs JavaScript for the scripts in its folder and the command-line tools its instructions call (node). Our summary lists: Node.js.

Does Fable Advisor access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Fable Advisor safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Fable Advisor use?

Fable Advisor is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Fable Advisor use?

About 262 tokens (SKILL.md is roughly 1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Fable Advisor?

Skills that share tags, products or a category with Fable Advisor: Fable Fable (mrtooher/fable-mode, 870 stars), Advisor Mode (cursor/plugins, 10k stars), Odoo Upgrade Advisor (sickn33/agentic-awesome-skills, 47k stars) and Token Budget Advisor (affaan-m/ECC, 274k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fable Advisor?

fcakyon (a GitHub user) maintains it in fcakyon/claude-codex-settings, which has 1,163 GitHub stars. The repository holds 43 skills in this directory. The repository was last updated on October 6, 2026.

Source: fcakyon/claude-codex-settings on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.