demo-skill

demo-skill is a skill for Claude Code, Codex from crystian/skill-map. It costs 28 tokens per session (96 once invoked), scanned A, original, MIT.

An example skill that reads a file, checks its frontmatter against defined schemas, and produces a Markdown report. Frontmatter is structured metadata placed at the start of a text file.

In plain words
What is it for?
Use it as a reference for skills that inspect files, validate metadata, and return a report.
Why use it?
It demonstrates the basic flow and structure expected of a skill in the demo collection.

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/crystian/skill-map/demo-skill
Any agent
npx skills add crystian/skill-map --skill demo-skill
Clone the repo
git clone --depth 1 https://github.com/crystian/skill-map

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 demo-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/crystian/skill-map/demo-skill.svg)](https://agentmods.dev/skills/crystian/skill-map/demo-skill)
Your own site
<a href="https://agentmods.dev/skills/crystian/skill-map/demo-skill"><img src="https://agentmods.dev/badge/skills/crystian/skill-map/demo-skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 96 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 $0.00028 $0.00096
Opus 5 $0.00014 $0.00048
Sonnet 5 $0.00006 $0.00019
Haiku 4.5 $0.00003 $0.00010

Measured 4d ago against content hash cc09e9261f28, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

demo-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 4d 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.

.claude/skills/sm-tutorial/fixtures-data/sets/prologue/en/__PROVIDER__/skills/demo-skill/SKILL.md · 17 lines

What it actually says

demo-skill

This skill walks a file and returns a report. Will be wired up to the rest of the demo fixture in the next sub-step.

Steps

  1. Read the target.
  2. Validate the frontmatter against the schemas.
  3. Generate the report.
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. 4d ago First seen · 17 lines · 28 tokens per session scan A cc09e9261f28

Subscribe to this mod's changes

demo-skill is a skill published in the GitHub repository crystian/skill-map (60 stars, last pushed yesterday), licensed MIT. It adds 28 tokens to every session and 96 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 2026-08-30.

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