Is the Fable Native Code skill free?

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

What is the Fable Native Code SkillProof Score?

9.6/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.

How do I install Fable Native Code?

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 Native Code 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 Native Code

Makes diffs match the file's existing idiom instead of your default habits.

by DizzyMii · DizzyMii/fable-skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.6/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 60bc75e

Real A/B on a terse 4-method Go ring buffer: my unguided addition included a doc comment, an error return no sibling method uses, a defensive nil-check comment, and a TODO; following the skill produced a 3-line method indistinguishable from the file's other methods. Repo ships real pressure-test transcripts (bench/fixtures/transcripts/s6-native-code/) backing its 'tested on Opus 4.8' claim.

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 9/10
Docs & honesty 5/5

What Fable Native Code does

Enforces that new code additions mirror the surrounding file's naming, comment density, and error-handling style rather than the model's default verbose habits. Triggers before adding comments, docstrings, try/catch, validation, logging, or TODOs to an existing file, and before narrating style choices in the reply.

How to install Fable Native Code

git clone https://github.com/DizzyMii/fable-skills
cd fable-skills
mkdir -p ~/.claude/skills
cp -r skills/fable-native-code ~/.claude/skills/fable-native-code

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

Commands — how to trigger Fable Native Code

/fable-native-code Makes diffs match the file's existing idiom instead of your default habits.

It also activates on plain-language prompts like these:

add a Last method to this Go file matching its existing terse style
make this new function look like it was written by the same author
add error handling here without changing the file's existing style

Frequently asked questions

Is the Fable Native Code skill free?: Yes. The skill itself is free from DizzyMii/fable-skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Fable Native Code work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Tested · Works. Real A/B on a terse 4-method Go ring buffer: my unguided addition included a doc comment, an error return no sibling method uses, a defensive nil-check comment, and a TODO; following the skill produced a 3-line method indistinguishable from the file's other methods. Repo ships real pressure-test transcripts (bench/fixtures/transcripts/s6-native-code/) backing its 'tested on Opus 4.8' claim.
What is the Fable Native Code SkillProof Score?: 9.6/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.
How do I install Fable Native Code?: 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 Native Code 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.