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skill-creator

skill-creator is a skill for Claude Code, Codex from zby/commonplace. It costs 64 tokens per session (7,248 once invoked), scanned A, original, CC-BY-4.0.

A tool for creating, editing, improving, and testing skills for coding agents.

In plain words
What is it for?
Use it to build skills, revise existing ones, run evaluations, compare performance, and improve triggering descriptions.
Why use it?
It helps turn an idea into a usable skill and check whether the skill works reliably, including whether its description triggers it at the right times.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 92repo changed 1mo ago A scan 64 tokens CC-BY-4.0

Good fit Use it to build skills, revise existing ones, run evaluations, compare performance, and improve triggering descriptions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zby/commonplace/claude-code-skill-creator
View source ↗ zby/commonplace
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 zby/commonplace --skill claude-code-skill-creator
Clone the repo
git clone --depth 1 https://github.com/zby/commonplace

Made for: Claude Code, Codex.

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.

agentmods badge for skill-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/zby/commonplace/claude-code-skill-creator/github.svg)](https://agentmods.dev/skills/zby/commonplace/claude-code-skill-creator)
Your own site
<a href="https://agentmods.dev/skills/zby/commonplace/claude-code-skill-creator"><img src="https://agentmods.dev/badge/skills/zby/commonplace/claude-code-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.

agentmods 80×15 button for skill-creator

Your own site · 80×15
<a href="https://agentmods.dev/skills/zby/commonplace/claude-code-skill-creator"><img src="https://agentmods.dev/badge/skills/zby/commonplace/claude-code-skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,248 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.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00064 $0.07248
Opus 5.5 $0.00026 $0.02899
Sonnet 5.5 $0.00013 $0.01450
Haiku 4.5 $0.00006 $0.00725

Measured 1mo ago against content hash 72fd27ff16d1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo ago.

The scan reads SKILL.md. This mod also ships 10 executable files (eval-viewer/generate_review.py, scripts/__init__.py, scripts/aggregate_benchmark.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.

kb/work/skill-creator-distillation/sources/claude-code-skill-creator/SKILL.md · 487 lines

The source is not reproduced here

Licensed CC-BY-4.0

The repository is licensed CC-BY-4.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

17 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.

  1. 1mo ago Changed 72fd27ff16d1
  2. 1mo ago Changed 688aebe028f2
  3. 2mo ago First seen · 487 lines · 64 tokens per session scan A 52436823855f

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository zby/commonplace (92 stars, last pushed today), licensed CC-BY-4.0. It adds 64 tokens to every session and 7,248 once invoked, about $0.0003 per session on Opus 5.5. 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.

Building agentsClaude Codeagent-skillsai-agentscontext-engineeringknowledge-basellm-wiki
Related

skill-creator compared with skills from other repositories

skill-creator next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
skill-creatorzby/commonplaceSkill92todayCC-BY-4.0A64Claude Code, Codex
book-to-skillvirgiliojr94/book-to-skillSkill37k5d agoMITC105Claude Code, Codex
llm-wikizosmaai/pi-llm-wikiSkill6265d agoMITA52Claude Code
mindbasefrankchu91/mindbase-llm-wikiSkill13723d agoMITA105Claude Code
llm-wiki-pmanh-chu/llm-wiki-pmSkill7todayMITA74Claude Code
llm-wiki-briefanh-chu/llm-wiki-pmSkill7todayMITA34Claude Code
deeprefineHKUST-KnowComp/DeepRefine-SkillSkill902mo agoMITA42Claude Code, Codex