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 koolamusic/claudefiles --skill skill-creatorgit clone --depth 1 https://github.com/koolamusic/claudefilesWrote 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/koolamusic/claudefiles/skill-creator)<a href="https://agentmods.dev/skills/koolamusic/claudefiles/skill-creator"><img src="https://agentmods.dev/badge/skills/koolamusic/claudefiles/skill-creator/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/koolamusic/claudefiles/skill-creator"><img src="https://agentmods.dev/badge/skills/koolamusic/claudefiles/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00042 | $0.01491 |
| Opus 5.5 | $0.00017 | $0.00596 |
| Sonnet 5.5 | $0.00008 | $0.00298 |
| Haiku 4.5 | $0.00004 | $0.00149 |
Grade A, and why
skill-creator 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 28d 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 — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
Create effective, tested skills that extend Claude's capabilities with specialized knowledge, workflows, and tools.
About Skills
Skills are modular packages that provide:
- Specialized workflows - Multi-step procedures for specific domains
- Tool integrations - Instructions for working with specific file formats or APIs
- Domain expertise - Company-specific knowledge, schemas, business logic
- Bundled resources - Scripts, references, and assets for complex tasks
Core Principles
Concise is Key
The context window is a public good. Only add context Claude doesn't already have. Challenge each piece: "Does Claude really need this?" Prefer concise examples over verbose explanations.
Set Appropriate Degrees of Freedom
- High freedom (text instructions): Multiple approaches valid, context-dependent
- Medium freedom (pseudocode/parameterized scripts): Preferred pattern exists, some variation OK
- Low freedom (specific scripts): Fragile operations, consistency critical
Progressive Disclosure
Three-level loading to manage context efficiently:
- Metadata (name + description) - Always in context (~100 words)
- SKILL.md body - When skill triggers (<5k words, under 500 lines)
- Bundled resources - As needed (unlimited, loaded on demand)
Skill Anatomy
skill-name/
├── SKILL.md # Required: frontmatter + instructions
├── scripts/ # Optional: executable code (Python/Bash)
├── references/ # Optional: docs loaded into context as needed
└── assets/ # Optional: files used in output (templates, icons)
SKILL.md Frontmatter
Only name and description are required. The description is the primary trigger — it determines when the skill loads.
---
name: my-skill
description: Use when [specific triggering conditions and symptoms]
---
Description rules:
- Start with "Use when..." — focus on triggering conditions
- Include specific symptoms, situations, and contexts
- Write in third person
- NEVER summarize the skill's workflow in the description (Claude may follow the summary instead of reading the full skill)
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 28d ago First seen · 168 lines · 42 tokens per session scan A 1759830f90fb
skill-creator is a skill published in the GitHub repository koolamusic/claudefiles (130 stars, last pushed 3d ago), licensed MIT. It adds 42 tokens to every session and 1,491 once invoked, about $0.0002 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 2026-09-20.
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