skill-creator

skill-creator is a skill for Claude Code, Codex from Mangi-11/Eta. It costs 35 tokens per session (863 once invoked), scanned A, original, no licence file.

A guide for creating and updating skills, which are reusable instructions for an agent’s workflows or subject knowledge.

In plain words
What is it for?
Creating skills, revising them, and documenting workflows or domain-specific knowledge.
Why use it?
It helps structure new skills and improve existing ones when an agent needs repeatable guidance.

Skill for Claude CodeCodex

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

Good fit Creating skills, revising them, and documenting workflows or domain-specific knowledge.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mangi-11/eta/skill-creator
View source ↗ Mangi-11/Eta
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 Mangi-11/Eta --skill skill-creator
Clone the repo
git clone --depth 1 https://github.com/Mangi-11/Eta

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/mangi-11/eta/skill-creator.svg)](https://agentmods.dev/skills/mangi-11/eta/skill-creator)
Your own site
<a href="https://agentmods.dev/skills/mangi-11/eta/skill-creator"><img src="https://agentmods.dev/badge/skills/mangi-11/eta/skill-creator.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 863 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 pass 7 Sept 2026
How audits are shown
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 $0.00035 $0.00863
Opus 5 $0.00017 $0.00432
Sonnet 5 $0.00007 $0.00173
Haiku 4.5 $0.00003 $0.00086

Measured 8d ago against content hash c95dd0e3c162, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, 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 8d ago.

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.

app/src/main/assets/builtin_skills/skill-creator/SKILL.md · 139 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 8d ago First seen · 139 lines · 35 tokens per session scan A c95dd0e3c162

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository Mangi-11/Eta (1,324 stars, last pushed 2d ago), with no licence file. It adds 35 tokens to every session and 863 once invoked, about $0.0002 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.