starter-skill

starter-skill is a skill for Claude Code, Codex from CardSorting/LUMI-JOY. It costs 16 tokens per session (128 once invoked), scanned A, original, Apache-2.0.

A basic template for defining an agent skill with ordered steps for preparing, executing, and checking work, plus safety rules for handling errors and input requirements.

In plain words
What is it for?
Use it as a starting point when writing a new procedural skill with prerequisites, execution steps, verification, and error handling.
Why use it?
It gives skill authors a small structure for describing procedures and checking that actions were performed safely.

Skill for Claude CodeCodex

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/cardsorting/lumi-joy/starter-skill
Any agent
npx skills add CardSorting/LUMI-JOY --skill starter-skill
Clone the repo
git clone --depth 1 https://github.com/CardSorting/LUMI-JOY

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 starter-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/cardsorting/lumi-joy/starter-skill.svg)](https://agentmods.dev/skills/cardsorting/lumi-joy/starter-skill)
Your own site
<a href="https://agentmods.dev/skills/cardsorting/lumi-joy/starter-skill"><img src="https://agentmods.dev/badge/skills/cardsorting/lumi-joy/starter-skill.svg" alt="Measured on agentmods" 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 128 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 $0.00016 $0.00128
Opus 5 $0.00008 $0.00064
Sonnet 5 $0.00003 $0.00026
Haiku 4.5 $0.00002 $0.00013

Measured 5d ago against content hash 0453f66e73f2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

starter-skill 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 5d 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/templates/starter-skill/SKILL.md · 21 lines

What it actually says

Starter Skill Guide

Use this template to define structured capabilities for your agent.

📋 Execution Protocol

  1. Prepare: Validate input parameters and prerequisites.
  2. Execute: Carry out step-by-step actions.
  3. Verify: Assert output state and report metrics.

🛡️ Operational Guardrails

  • Assert all input invariants before applying changes.
  • Handle exceptions gracefully with clear error context.
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. 5d ago First seen · 21 lines · 16 tokens per session scan A 0453f66e73f2

Subscribe to this mod's changes

starter-skill is a skill published in the GitHub repository CardSorting/LUMI-JOY (2 stars, last pushed 7d ago), licensed Apache-2.0. It adds 16 tokens to every session and 128 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 2026-08-31.

Related

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