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hello-world

hello-world is a skill for Claude Code, Codex from vudknguyen/openskill. It costs 19 tokens per session (95 once invoked), scanned A, original, MIT.

A minimal example of a skill that gives the user a friendly greeting. It mainly demonstrates the basic structure of a skill.

In plain words
What is it for?
Use it to test or demonstrate a simple skill that responds to a request such as asking the assistant to say hello.
Why use it?
It provides a small, clear example for understanding how a skill is organized and what it can do.

Skill for Claude CodeCodex

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

not rated 11repo 6mo ago A scan 19 tokens original MIT

Good fit Use it to test or demonstrate a simple skill that responds to a request such as asking the assistant to say hello.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/vudknguyen/openskill/example-skill
View source ↗ vudknguyen/openskill
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 vudknguyen/openskill --skill example-skill
Clone the repo
git clone --depth 1 https://github.com/vudknguyen/openskill

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 hello-world

README.md
[![agentmods](https://agentmods.dev/badge/skills/vudknguyen/openskill/example-skill/github.svg)](https://agentmods.dev/skills/vudknguyen/openskill/example-skill)
Your own site
<a href="https://agentmods.dev/skills/vudknguyen/openskill/example-skill"><img src="https://agentmods.dev/badge/skills/vudknguyen/openskill/example-skill/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 hello-world

Your own site · 80×15
<a href="https://agentmods.dev/skills/vudknguyen/openskill/example-skill"><img src="https://agentmods.dev/badge/skills/vudknguyen/openskill/example-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 95 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 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 $0.00019 $0.00095
Opus 5.5 $0.00008 $0.00038
Sonnet 5.5 $0.00004 $0.00019
Haiku 4.5 $0.00002 $0.00010

Measured 2mo ago against content hash c0bad1023f41, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hello-world 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 2mo 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.

example-skill/SKILL.md · 25 lines

What it actually says

Hello World

A simple skill that responds with a friendly greeting.

Usage

Ask the assistant to greet you:

Say hello to me

What it does

  • Responds with a personalized greeting
  • Demonstrates the minimal skill structure
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. 2mo ago First seen · 25 lines · 19 tokens per session scan A c0bad1023f41

Subscribe to this mod's changes

hello-world is a skill published in the GitHub repository vudknguyen/openskill (11 stars, last pushed 6mo ago), licensed MIT. It adds 19 tokens to every session and 95 once invoked, about $0.0001 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 2026-08-31.

Related

hello-world compared with skills from other repositories

hello-world next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
hello-worldvudknguyen/openskillSkill116mo agoMITA19Claude Code, Codex
imagegenopenai/codexSkill135ktodayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill100ktodayApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill80k6d agoMITA200Claude Code, Codex
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
systematic-debuggingobra/superpowersSkill317k9d agoMITA21Claude Code