Is the Fable Fanout skill free?

Yes. The skill itself is free from rennf93/opus-fable-playbook. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Fable Fanout SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.

How do I install Fable Fanout?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Fable Fanout with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Fable Fanout

Forces parallel one-message delegation instead of serial spawn-wait-spawn on multi-unit tasks.

by rennf93 · rennf93/opus-fable-playbook

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 43e6dfc

Ran the same 3 independent lookups two ways: baseline as 3 separate serial round-trips vs skill-guided as 1 batched round-trip with 3 tool calls — identical facts, but 66% fewer round-trips under the skill's 'never spawn one, wait, spawn the next' rule; README candidly admits the doctrine still loses on 1 of 24 parallelism probes rather than oversell the win.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 7/10
Docs & honesty 5/5

What Fable Fanout does

A short decision-tree prompt that tells the agent when to skip delegation (single known fact), when to delegate a broad search to an Explore/general-purpose agent, and when 2+ independent units of work exist to fan them out in one parallel message rather than serially. Triggers on multi-file/multi-module/multi-question tasks and broad codebase sweeps; explicitly does not apply to single-fact lookups or single-file edits.

How to install Fable Fanout

git clone https://github.com/rennf93/opus-fable-playbook
cd opus-fable-playbook
mkdir -p ~/.claude/skills
cp -r skills/fable-fanout ~/.claude/skills/fable-fanout

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Fable Fanout

/fable-fanout Forces parallel one-message delegation instead of serial spawn-wait-spawn on multi-unit tasks.

It also activates on plain-language prompts like these:

Check these five config files for outdated API keys, all at once
Answer three separate questions about our auth, billing, and logging modules
Do a broad sweep of the codebase for every deprecated logger call

Frequently asked questions

Is the Fable Fanout skill free?: Yes. The skill itself is free from rennf93/opus-fable-playbook. SkillProof publishes the install command and an independent test verdict at no cost.
Does Fable Fanout work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Tested · Works. Ran the same 3 independent lookups two ways: baseline as 3 separate serial round-trips vs skill-guided as 1 batched round-trip with 3 tool calls — identical facts, but 66% fewer round-trips under the skill's 'never spawn one, wait, spawn the next' rule; README candidly admits the doctrine still loses on 1 of 24 parallelism probes rather than oversell the win.
What is the Fable Fanout SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 7/10, docs & honesty 5/5.
How do I install Fable Fanout?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Fable Fanout with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.