skill-creator

skill-creator is a skill for Claude Code, Codex from tamnguyendinh/Anvien. It costs 16 tokens per session (3,070 once invoked), scanned A, original, MIT.

A guide for creating or updating skills for coding agents. Skills are instruction packages that teach an agent a repeatable development workflow, including relevant tools, domain knowledge, and supporting files.

In plain words
What is it for?
Use it to design a new skill, revise an existing one, or add the supporting references, scripts, templates, and assets it needs.
Why use it?
It helps keep agent instructions focused, practical, self-contained, and reusable instead of turning them into general documentation.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: reads .claude/ paths; mentions subagents; names the AskUserQuestion tool.

Good fit Use it to design a new skill, revise an existing one, or add the supporting references, scripts, templates, and assets it needs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tamnguyendinh/anvien/skill-creator
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 tamnguyendinh/Anvien --skill skill-creator
Clone the repo
git clone --depth 1 https://github.com/tamnguyendinh/Anvien

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/tamnguyendinh/anvien/skill-creator/github.svg)](https://agentmods.dev/skills/tamnguyendinh/anvien/skill-creator)
Your own site
<a href="https://agentmods.dev/skills/tamnguyendinh/anvien/skill-creator"><img src="https://agentmods.dev/badge/skills/tamnguyendinh/anvien/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/tamnguyendinh/anvien/skill-creator"><img src="https://agentmods.dev/badge/skills/tamnguyendinh/anvien/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,070 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 high

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 →

  • high Rogue Agent · line 204
    Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.
    Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00016 $0.03070
Opus 5 $0.00008 $0.01535
Sonnet 5 $0.00003 $0.00614
Haiku 4.5 $0.00002 $0.00307

Measured 7d ago against content hash 836abc362557, 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 7d 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.

internal/aicontext/skills/skill-creator/SKILL.md · 245 lines

How it starts

The opening of the file, as written. The whole thing — 245 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Creator

This skill provides guidance for creating effective skills.

About Skills

Skills are modular, self-contained packages that extend Claude's capabilities by providing specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific domains or tasks—they transform Claude from a general-purpose agent into a specialized agent equipped with procedural knowledge that no model can fully possess.

IMPORTANT:

  • Skills are not documentation, they are practical instructions for Claude Code to use the tools, packages, plugins or APIs to achieve the tasks.
  • Each skill teaches Claude how to perform a specific development task, not what a tool does.
  • Claude Code can activate multiple skills automatically to achieve the user's request.

What Skills Provide

  1. Specialized workflows - Multi-step procedures for specific domains
  2. Tool integrations - Instructions for working with specific file formats or APIs
  3. Domain expertise - Company-specific knowledge, schemas, business logic
  4. Bundled resources - References and assets for complex and reusable task context

Anatomy of a Skill

Every skill consists of a required SKILL.md file and optional bundled resources:

.claude/skills/
└── skill-name/
    ├── SKILL.md (required)
    │   ├── YAML frontmatter metadata (required)
    │   │   ├── name: (required)
    │   │   ├── description: (required)
    │   │   ├── license: (optional)
    │   │   └── version: (optional)
    │   └── Markdown instructions (required)
    └── Bundled Resources (optional)
        ├── references/       - Documentation intended to be loaded into context as needed
        └── assets/           - Files used in output (templates, icons, fonts, etc.)
Requirements (IMPORTANT)
  • Skill should be combined into specific topics, for example: cloudflare, cloudflare-r2, cloudflare-workers, docker, gcloud should be combined into devops
  • SKILL.md should be less than 150 lines and include the references of related markdown files and assets.
  • Each referenced markdown file should be also less than 150 lines, remember that you can always split them into multiple files (progressive disclosure principle).
  • Descriptions in metadata of SKILL.md files should be both concise (less than 200 characters) and still contains enough usecases of the references and assets, this will help skills can be activated automatically during the implementation process of Claude Code.
  • Referenced markdowns:
    • Prefer concise wording, but never sacrifice precision, scope, or exceptions for brevity.
    • Can reference other markdown files or assets as needed.

Read the full file on GitHub · 245 lines

Files

What ships with it

5 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. 7d ago First seen · 245 lines · 16 tokens per session scan A 836abc362557

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository tamnguyendinh/Anvien (9 stars, last pushed today), licensed MIT. It adds 16 tokens to every session and 3,070 once invoked, about $0.0001 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 2026-09-03.

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