Agent skill

Skill Creator

Creates new Skills following Anthropic best practices. An agent skill from YougLin-dev/Aha-Loop.

Install Skill Creator

skills CLI

$ npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a claude-code

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

GitHub CLI

$ gh skill install YougLin-dev/Aha-Loop skill-creator --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/YougLin-dev/Aha-Loop.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/skill-creator .claude/skills/skill-creator && 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/

Paste into Claude Code

Install the "skill-creator" agent skill from https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator into .claude/skills/skill-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-creator", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install YougLin-dev/Aha-Loop skill-creator --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YougLin-dev/Aha-Loop.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/skill-creator .agents/skills/skill-creator && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "skill-creator" agent skill from https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator into .agents/skills/skill-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-creator", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install YougLin-dev/Aha-Loop skill-creator --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YougLin-dev/Aha-Loop.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/skill-creator .cursor/skills/skill-creator && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "skill-creator" agent skill from https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator into .cursor/skills/skill-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-creator", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/YougLin-dev/Aha-Loop.git --path .agents/skills/skill-creator

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install YougLin-dev/Aha-Loop skill-creator --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YougLin-dev/Aha-Loop.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/skill-creator .gemini/skills/skill-creator && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "skill-creator" agent skill from https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator into .gemini/skills/skill-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-creator", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install YougLin-dev/Aha-Loop skill-creator

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/YougLin-dev/Aha-Loop.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/skill-creator .github/skills/skill-creator && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "skill-creator" agent skill from https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator into .github/skills/skill-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-creator", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install YougLin-dev/Aha-Loop skill-creator --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YougLin-dev/Aha-Loop.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/skill-creator .opencode/skills/skill-creator && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "skill-creator" agent skill from https://github.com/YougLin-dev/Aha-Loop/tree/main/.agents/skills/skill-creator into .opencode/skills/skill-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-creator", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: skill-creator
GitHub stars: 181
Token cost: ~1k tokens
SKILL.md length: 248 words
Files: 1
Skills in repo: 15
Repo updated: Feb 3, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Creates new Skills following Anthropic best practices. An agent skill from YougLin-dev/Aha-Loop.

Discovering reusable workflows
SKILL.md covers When to Create a Skill, SKILL.md Structure, Skill Body Template and Best Practices, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Repetitive patterns

What it does

Skill Creator is an agent skill from YougLin-dev/Aha-Loop. Creates new Skills following Anthropic best practices. Use when discovering reusable workflows or repetitive patterns. Triggers on: create skill, new workflow, codify this process, standardize workflow.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering Skill authoring and CI/CD. The repository describes itself as: [MVP] Aha Loop is a fully autonomous AI development system, extended from the core ideas of Ralph. It's not just an execution engine, but a complete AI development framework with… The licence is MIT.

When your agent uses it

Discovering reusable workflows
Repetitive patterns
Codify this process
Standardize workflow

Example prompts

“Use the skill-creator skill to create new Skills following Anthropic best practices. An agent skill from YougLin-dev/Aha-Loop”
“/skill-creator”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 8d799b2. 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
No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown and yaml).
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

Skill Creator loads about 1k tokens when it runs. Until then it costs about 54 tokens; SKILL.md has 248 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: ~1k

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from YougLin-dev/Aha-Loop at commit 8d799b2, republished under its MIT licence (© YougLin-dev). 248 words, ~1,010 tokens.

Download SKILL.mdSave it as .claude/skills/skill-creator/SKILL.md (or your agent's skills folder).

name: skill-creator
description: Creates new Skills following Anthropic best practices. Use when discovering reusable workflows or repetitive patterns. Triggers on: create skill, new workflow, codify this process, standardize workflow.

Skill Creator

Creates well-structured Skills following Anthropic's official best practices.

When to Create a Skill

Good candidates:

Repeated 3+ times
Complex multi-step workflows
Error-prone processes
Domain-specific knowledge

Not worth codifying:

One-off tasks
Highly variable processes
Trivial single-step actions

SKILL.md Structure

Required Frontmatter

yaml

---
name: processing-documents
description: "Processes documents and extracts data. Use when working with PDF or Word files. Triggers on: process document, extract data."
---

Field requirements:

Field	Rules
`name`	Max 64 chars, lowercase letters/numbers/hyphens only
`description`	Max 1024 chars, non-empty, use third person

Naming Convention

Use gerund form (verb + -ing):

processing-pdfs
analyzing-spreadsheets
managing-databases

Avoid: helper, utils, tools, anthropic-*, claude-*

Writing Descriptions

Always use third person (injected into system prompt):

yaml

# Good
description: "Processes Excel files and generates reports"

# Avoid
description: "I can help you process Excel files"
description: "You can use this to process Excel files"

Be specific and include triggers:

yaml

description: "Analyzes BigQuery data and generates reports. Use when querying sales metrics or creating dashboards. Triggers on: analyze data, bigquery report, sales metrics."

Skill Body Template

markdown

# [Skill Title]

[One sentence describing what this skill does]

## Quick Start

[Minimal example to get started - under 50 tokens]

## Process

1. [Step 1]
2. [Step 2]
3. [Step 3]

## Advanced Features

**[Feature A]**: See [FEATURE_A.md](FEATURE_A.md)
**[Feature B]**: See [FEATURE_B.md](FEATURE_B.md)

Best Practices

Be Concise

Only add context Claude doesn't already have. Challenge each piece:

"Does Claude really need this explanation?"
"Can I assume Claude knows this?"

Good (~50 tokens):

markdown

## Extract PDF text

Use pdfplumber:
\`\`\`python
import pdfplumber
with pdfplumber.open("file.pdf") as pdf:
    text = pdf.pages[0].extract_text()
\`\`\`

Bad (~150 tokens): Explaining what PDFs are and how libraries work.

Keep Under 500 Lines

If content exceeds 500 lines, split into separate files using progressive disclosure.

One-Level Deep References

Keep all reference files linked directly from SKILL.md:

markdown

# SKILL.md
**Basic usage**: [instructions here]
**Advanced features**: See [advanced.md](advanced.md)
**API reference**: See [reference.md](reference.md)

Avoid Time-Sensitive Info

Use "old patterns" section instead of dates:

markdown

## Current method
Use the v2 API endpoint.

## Old patterns
<details>
<summary>Legacy v1 API (deprecated)</summary>
The v1 API used different endpoints...
</details>

Use Consistent Terminology

Choose one term and stick with it:

Always "API endpoint" (not mix with "URL", "route", "path")
Always "extract" (not mix with "pull", "get", "retrieve")

Directory Structure

skill-name/
├── SKILL.md              # Main instructions (< 500 lines)
├── ADVANCED.md           # Advanced features (loaded as needed)
├── REFERENCE.md          # API reference (loaded as needed)
└── scripts/
    └── utility.py        # Executed, not loaded into context

Checklist

Before saving:

Name uses gerund form and kebab-case
Description is third person and specific
Description includes what it does AND when to use it
SKILL.md body under 500 lines
No unnecessary explanations Claude already knows
References are one level deep
No time-sensitive information
Consistent terminology throughout

Files

Just SKILL.md in .agents/skills/skill-creator of YougLin-dev/Aha-Loop.

Open the folder on GitHubat commit 8d799b2

Compare with similar skills

Skill Creator 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.

Skill Creator compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Skill Creator this skillYougLin-dev/Aha-Loop	181	—	~1k	Automated safety check: Pass	MIT	8 mo ago
Run History Skill Builderdongshuyan/compass-skills	751	—	~1.8k	Automated safety check: Pass	MIT	1 mo ago
Global Skill Creatorwcygan/dotfiles	196	—	~371	Automated safety check: Pass	None	today
Skill CreatorAzure/azqr	795	89 repos	~8.2k	Automated safety check: Pass	Apache-2.0	2 days ago
Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase	10k	11 repos	~3.5k	Automated safety check: Pass	MIT	2 mo ago
Darwin Skill Optimizeralchaincyf/darwin-skill	6.2k	1 repos	~4.7k	Automated safety check: Pass	MIT	19 days ago

Similar skills

Run History Skill Builder
dongshuyan/compass-skills
Turn a completed task, browser flow, artifact pipeline, failure-recovery trace, or repeatedly refined workflow into a new reusable skill package or a reviewed skill-design plan.
751 GitHub stars~1.8k tokensUpdated 1 mo ago
Agent WorkflowsAuto-check passed
Global Skill Creator
wcygan/dotfiles
Route reusable Codex skill requests from dotfiles to the authoritative agent-skills repository.
196 GitHub stars~371 tokensUpdated today
Agent WorkflowsAuto-check passed
Skill Creator
Azure/azqr
Official
Create new skills, modify and improve existing skills, and measure skill performance.
795 GitHub starsUsed in 89 repos~8.2k tokens
Agent WorkflowsAuto-check passed
Claude Code Skill Developer Guide
diet103/claude-code-infrastructure-showcase
A guide to creating and managing Claude Code skills with auto-activation: skill-rules.json triggers, hooks, enforcement levels, YAML frontmatter and progressive disclosure.
10k GitHub starsUsed in 11 repos~3.5k tokens
Agent WorkflowsAuto-check passed
Darwin Skill Optimizer
alchaincyf/darwin-skill
Scores SKILL.md files on a nine-dimension rubric, then improves them in a keep-or-revert loop with independent judge agents, test prompts, git history and human checkpoints.
6.2k GitHub starsUsed in 1 repo~4.7k tokens
Agent WorkflowsAuto-check passed
Claude Code Command Development
anthropics/claude-plugins-official
Official
Explains how to write Claude Code slash commands: Markdown files with YAML frontmatter, arguments, file references, bash context and interactive prompts.
38k GitHub starsUsed in 10 repos~4.8k tokens
Agent WorkflowsAuto-check passed

Questions about Skill Creator

What does Skill Creator do?

Creates new Skills following Anthropic best practices. An agent skill from YougLin-dev/Aha-Loop. Skill Creator is an agent skill from YougLin-dev/Aha-Loop. Creates new Skills following Anthropic best practices.

When should I use Skill Creator?

Skill Creator fits situations like: discovering reusable workflows; repetitive patterns; codify this process; standardize workflow.

How do I install Skill Creator in Claude Code?

Run `npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a claude-code`. Or copy the skill folder (.agents/skills/skill-creator in YougLin-dev/Aha-Loop) into .claude/skills/skill-creator in your project. Claude Code loads it when a task matches its description.

How do I install Skill Creator in Codex?

Run `npx skills add YougLin-dev/Aha-Loop --skill skill-creator -a codex`. Or copy the skill folder (.agents/skills/skill-creator in YougLin-dev/Aha-Loop) into .agents/skills/skill-creator in your project. Codex loads it when a task matches its description.

Can I use Skill Creator 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 YougLin-dev/Aha-Loop --skill skill-creator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-creator, .gemini/skills/skill-creator, .github/skills/skill-creator and .opencode/skills/skill-creator in your project.

What does Skill Creator need to run?

SKILL.md names no scripts, command-line tools or credentials: Skill Creator is instructions for the agent only. Our summary lists: Python 3.

Does Skill Creator 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 Skill Creator 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. Review the folder before installing.

What licence does Skill Creator use?

Skill Creator is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Skill Creator use?

About 1k tokens (SKILL.md is roughly 4k 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 Skill Creator?

Skills that share tags, products or a category with Skill Creator: Run History Skill Builder (dongshuyan/compass-skills, 751 stars), Global Skill Creator (wcygan/dotfiles, 196 stars), Skill Creator (Azure/azqr, 795 stars) and Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skill Creator?

YougLin-dev (a GitHub user) maintains it in YougLin-dev/Aha-Loop, which has 181 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on February 3, 2026.

Source: YougLin-dev/Aha-Loop on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Skill Creator

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Skill Creator

When to Create a Skill

SKILL.md Structure

Required Frontmatter

Naming Convention

Writing Descriptions

Skill Body Template

Best Practices

Be Concise

Keep Under 500 Lines

One-Level Deep References

Avoid Time-Sensitive Info

Use Consistent Terminology

Directory Structure

Checklist

Files

Compare with similar skills

Similar skills

More from YougLin-dev/Aha-Loop

Related

Questions about Skill Creator