What is skill-creator?

A guide and workflow for creating Claude Code skills, which are reusable instructions for coding tasks. It covers the required SKILL.md file, folder structure, validation, packaging, and trigger descriptions.

Use it to create, edit, validate, package, or improve Claude Code skills and their marketplace entries.

It removes the need to remember the repository’s rules for writing and packaging skills.

skill-creator — Skill for Claude Code by michaelChe956

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 michaelChe956/Cadence-skills --skill skill-creator

Clone the repo

git clone --depth 1 https://github.com/michaelChe956/Cadence-skills

Made for: Claude Code.

Or install cadence-init, the plugin that ships this one along with the rest of its 13 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/michaelche956/cadence-skills/skill-creator/github.svg)](https://agentmods.dev/skills/michaelche956/cadence-skills/skill-creator)

Your own site

<a href="https://agentmods.dev/skills/michaelche956/cadence-skills/skill-creator"><img src="https://agentmods.dev/badge/skills/michaelche956/cadence-skills/skill-creator/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/michaelche956/cadence-skills/skill-creator"><img src="https://agentmods.dev/badge/skills/michaelche956/cadence-skills/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 641 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Rogue Agent · line 10
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00056	$0.00641
Opus 5	$0.00028	$0.00320
Sonnet 5	$0.00011	$0.00128
Haiku 4.5	$0.00006	$0.00064

Measured 10d ago against content hash dcda5a8f318f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

skill-creator 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 10d ago.

The scan reads SKILL.md. This mod also ships 9 executable files (scripts/improve_description.py, scripts/init_skill.py, scripts/optimize_description.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

cadence-init/skills/skill-creator/SKILL.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Creator

Overview

Create and maintain Claude Code skills that can be installed through the Cadence marketplace and used directly in Claude Code.

When To Use

Use this skill when the user asks to:

create a new skill
edit an existing skill
validate skill frontmatter or structure
package a skill into .skill
evaluate or optimize skill description trigger behavior

Repository Contract

Skill directories live in skills/<skill-name>/
Every skill must contain SKILL.md
name in frontmatter must equal directory name
Optional directories: scripts/, references/, assets/
For project-local Claude Code usage, prefer .claude/skills/<skill-name>/SKILL.md
Use ~/.claude/skills/<skill-name>/SKILL.md only when the skill should be shared across projects

Execution Workflow

One-shot workflow (recommended in most cases):

python skills/skill-creator/scripts/skill_create_workflow.py --skill-name <skill-name> --package --optimize --apply

0b. One-shot workflow for project-local Claude Code skill (preferred for direct usage in the current project):

python skills/skill-creator/scripts/skill_create_workflow.py --skill-name <skill-name> --target project

0c. One-shot workflow for Claude Code GLOBAL skill:

python skills/skill-creator/scripts/skill_create_workflow.py --skill-name <skill-name> --target global

Scaffold a new skill:

python skills/skill-creator/scripts/init_skill.py <skill-name>

Validate structure:

python skills/skill-creator/scripts/quick_validate.py skills/<skill-name>

Package distributable file:

python skills/skill-creator/scripts/package_skill.py skills/<skill-name> dist

Evaluate current description trigger quality:

python skills/skill-creator/scripts/run_eval.py --eval-set <eval-set.json> --skill-path skills/<skill-name>

Optimize description in loop:

python skills/skill-creator/scripts/run_loop.py --eval-set <eval-set.json> --skill-path skills/<skill-name> --max-iterations 5 --apply

Read the full file on GitHub · 84 lines

Files

What ships with it

11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

10d ago First seen · 84 lines · 56 tokens per session scan A dcda5a8f318f

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository michaelChe956/Cadence-skills (11 stars, last pushed today), licensed MIT. It adds 56 tokens to every session and 641 once invoked, about $0.0003 per session on Opus 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 2026-08-30.

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