example-skill

example-skill is a skill for Claude Code, Codex from ronmkr/PromptBook. It costs 49 tokens per session (567 once invoked), scanned A, a copy of example-skill, Apache-2.0.

A reference template explaining how Antigravity plugin skills are structured and when they are used.

In plain words
What is it for?
Use it when creating a skill, checking required files and metadata, or learning common patterns for skill development.
Why use it?
It gives skill authors a concrete format and clarifies how skills differ from user-invoked commands and spawned agents.

Skill for Claude CodeCodex

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

Good fit Use it when creating a skill, checking required files and metadata, or…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ronmkr/promptbook/example-skill
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 ronmkr/PromptBook --skill example-skill
Clone the repo
git clone --depth 1 https://github.com/ronmkr/PromptBook

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 example-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/ronmkr/promptbook/example-skill.svg)](https://agentmods.dev/skills/ronmkr/promptbook/example-skill)
Your own site
<a href="https://agentmods.dev/skills/ronmkr/promptbook/example-skill"><img src="https://agentmods.dev/badge/skills/ronmkr/promptbook/example-skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 567 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 83% copy Near-identical to another mod 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 $0.00049 $0.00567
Opus 5 $0.00024 $0.00283
Sonnet 5 $0.00010 $0.00113
Haiku 4.5 $0.00005 $0.00057

Measured 6d ago against content hash 2184005468ac, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

example-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 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.

Origin

This is a copy

83% identical to example-skill — 10 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/standard/example-plugin/skills/example-skill/SKILL.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Example Skill

This skill demonstrates the structure and format for Antigravity plugin skills.

Overview

Skills are model-invoked capabilities that Gemini autonomously uses based on task context. Unlike commands (user-invoked) or agents (spawned by Gemini), skills provide contextual guidance that Gemini incorporates into its responses.

When This Skill Applies

This skill activates when the user's request involves:

  • Creating or understanding plugin skills
  • Skill template or reference needs
  • Skill development patterns

Skill Structure

Required Files

skills/
└── skill-name/
    └── SKILL.md          # Main skill definition (required)

Optional Supporting Files

skills/
└── skill-name/
    ├── SKILL.md          # Main skill definition
    ├── README.md         # Additional documentation
    ├── references/       # Reference materials
    │   └── patterns.md
    ├── examples/         # Example files
    │   └── sample.md
    └── scripts/          # Helper scripts
        └── helper.sh

Frontmatter Options

Skills support these frontmatter fields:

  • name (required): Skill identifier
  • description (required): Trigger conditions - describe when Gemini should use this skill
  • version (optional): Semantic version number
  • license (optional): License information or reference

Writing Effective Descriptions

The description field is crucial - it tells Gemini when to invoke the skill.

Good description patterns:

description: This skill should be used when the user asks to "specific phrase", "another phrase", mentions "keyword", or discusses topic-area.

Include:

  • Specific trigger phrases users might say
  • Keywords that indicate relevance
  • Topic areas the skill covers

Skill Content Guidelines

  1. Clear purpose: State what the skill helps with
  2. When to use: Define activation conditions
  3. Structured guidance: Organize information logically
  4. Actionable instructions: Provide concrete steps
  5. Examples: Include practical examples when helpful

Read the full file on GitHub · 85 lines

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 · 85 lines · 49 tokens per session scan A 2184005468ac

Subscribe to this mod's changes

example-skill is a skill published in the GitHub repository ronmkr/PromptBook (2 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 49 tokens to every session and 567 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 83% identical to example-skill, differing in 10 lines, and is treated as a copy.

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