agent-skill-creator

agent-skill-creator is a skill for Claude Code, Codex from HashLips/agent-skills. It costs 50 tokens per session (443 once invoked), scanned A, original, MIT.

A guide and workflow for creating reusable Agent Skills, which are instruction packages that tell a coding agent how to handle a task.

In plain words
What is it for?
Use it to create, standardise, or improve skills, including their metadata, main instructions, references, assets, and quality checks.
Why use it?
It helps keep skill files consistent, focused, and easy to maintain instead of putting all guidance into one large document.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

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.

agentmods
npx agentmods add skills/hashlips/agent-skills/agent-skill-creator
Any agent
npx skills add HashLips/agent-skills --skill agent-skill-creator
Clone the repo
git clone --depth 1 https://github.com/HashLips/agent-skills

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 agent-skill-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/hashlips/agent-skills/agent-skill-creator.svg)](https://agentmods.dev/skills/hashlips/agent-skills/agent-skill-creator)
Your own site
<a href="https://agentmods.dev/skills/hashlips/agent-skills/agent-skill-creator"><img src="https://agentmods.dev/badge/skills/hashlips/agent-skills/agent-skill-creator.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 443 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00050 $0.00443
Opus 5 $0.00025 $0.00221
Sonnet 5 $0.00010 $0.00089
Haiku 4.5 $0.00005 $0.00044

Measured 6d ago against content hash 6396759c36a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

agent-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 6d 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.

skills/agent-skill-creator/SKILL.md · 54 lines

What it actually says

Agent Skill Creator

Summary

  • Build coherent, reusable Agent Skills with low context cost.
  • Keep main SKILL.md operational; move depth into references.
  • Standardize structure and naming across repository skills.

Core Goals

  • Keep SKILL.md concise and action-oriented.
  • Store long-form guidance in references/.
  • Use consistent naming, layout, and discoverability patterns.
  • Avoid duplicated guidance across files.

Authoring Workflow

  1. Define skill intent and trigger scenarios.
  2. Write frontmatter (name, description).
  3. Draft minimal operational SKILL.md.
  4. Move depth into references.
  5. Add assets only if execution quality materially improves.
  6. Run quality checklist before finalizing.
  7. Apply final formatting pass using the available MD Design System skill.

Non-Negotiable Rules

  • Frontmatter is required.
  • name is lowercase kebab-case.
  • description states what the skill does and when to use it.
  • description pattern: <what it does>. Use when <trigger scenarios>.
  • Reference links are one-level deep and description-first.
  • Do not duplicate large guidance across main and reference files.
  • Before delivery, format produced Markdown with the local MD design system skill.

Reference Index

When To Use This Skill

  • Creating a new skill from scratch.
  • Refactoring existing skills for consistency.
  • Reducing token overhead in skill packages.
  • Standardizing team skill authoring patterns.
Files

What ships with it

3 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. 6d ago First seen · 54 lines · 50 tokens per session scan A 6396759c36a6

Subscribe to this mod's changes

agent-skill-creator is a skill published in the GitHub repository HashLips/agent-skills (24 stars, last pushed 11d ago), licensed MIT. It adds 50 tokens to every session and 443 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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