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.
npx skills add gmh5225/awesome-skills --skill skill-creationgit clone --depth 1 https://github.com/gmh5225/awesome-skillsWrote 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.
[](https://agentmods.dev/skills/gmh5225/awesome-skills/skill-creation)<a href="https://agentmods.dev/skills/gmh5225/awesome-skills/skill-creation"><img src="https://agentmods.dev/badge/skills/gmh5225/awesome-skills/skill-creation/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.
<a href="https://agentmods.dev/skills/gmh5225/awesome-skills/skill-creation"><img src="https://agentmods.dev/badge/skills/gmh5225/awesome-skills/skill-creation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00036 | $0.00662 |
| Opus 5.5 | $0.00014 | $0.00265 |
| Sonnet 5.5 | $0.00007 | $0.00132 |
| Haiku 4.5 | $0.00004 | $0.00066 |
Grade A, and why
skill-creation-guide 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creation Guide
Scope
Use this skill when:
- Creating new Agent Skills
- Understanding SKILL.md format and conventions
- Learning best practices for skill authoring
Skill Structure
skill-name/
├── SKILL.md # Required: Instructions and metadata
├── scripts/ # Optional: Helper scripts
├── templates/ # Optional: Document templates
└── resources/ # Optional: Reference files
SKILL.md Format
Required Frontmatter
---
name: my-skill-name
description: A clear description of what this skill does and when to use it.
---
Body Structure
# Skill Name
Detailed description of the skill's purpose.
## When to Use This Skill
- Use case 1
- Use case 2
## Instructions
[Detailed instructions for the agent]
## Examples
[Real-world examples]
Best Practices
- Keep descriptions exhaustive: The frontmatter description helps agents decide when to trigger the skill.
- Focus on execution: The body should contain clear, actionable steps.
- Use progressive disclosure: Put detailed references in
references/folder. - Include scripts for automation: Use helper scripts for deterministic operations.
- Keep SKILL.md under 500 lines: For optimal performance.
- Test across platforms: Verify skills work with Claude Code, Codex, etc.
Token Efficiency
Skills employ progressive disclosure architecture:
- Metadata loading (~100 tokens): Agent scans available skills
- Full instructions (<5k tokens): Load when skill is activated
- Bundled resources: Only load as needed
Platform-Specific Paths
| Platform | Project Path | Global Path |
|---|---|---|
| Claude Code | .claude/skills/ |
~/.claude/skills/ |
| Codex | .codex/skills/ |
~/.codex/skills/ |
| Cursor | .cursor/skills/ |
~/.cursor/skills/ |
| Gemini CLI | .gemini/skills/ |
~/.gemini/skills/ |
| GitHub Copilot | .github/skills/ |
~/.copilot/skills/ |
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.
- 1mo ago First seen · 103 lines · 36 tokens per session scan A 94c2164c7a39
skill-creation-guide is a skill published in the GitHub repository gmh5225/awesome-skills (97 stars, last pushed 4d ago), licensed MIT. It adds 36 tokens to every session and 662 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 2026-08-30.
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