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 OneDro1d/dark-factory --skill creating-skillsgit clone --depth 1 https://github.com/OneDro1d/dark-factoryWrote 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/onedro1d/dark-factory/creating-skills)<a href="https://agentmods.dev/skills/onedro1d/dark-factory/creating-skills"><img src="https://agentmods.dev/badge/skills/onedro1d/dark-factory/creating-skills/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/onedro1d/dark-factory/creating-skills"><img src="https://agentmods.dev/badge/skills/onedro1d/dark-factory/creating-skills.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 | $0.00046 | $0.01071 |
| Opus 5 | $0.00023 | $0.00535 |
| Sonnet 5 | $0.00009 | $0.00214 |
| Haiku 4.5 | $0.00005 | $0.00107 |
Grade A, and why
creating-skills 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 10d 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 — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating Claude Code Skills
A meta-skill for creating well-structured, discoverable, and effective Claude Code skills.
Overview
Claude Skills are markdown files that teach Claude specialized knowledge. They're automatically discovered based on their description, so writing effective descriptions is critical.
Quick Start
-
Choose location based on scope:
- Personal:
~/.claude/skills/your-skill/ - Project:
.claude/skills/your-skill/
- Personal:
-
Create directory and SKILL.md:
mkdir -p .claude/skills/your-skill -
Write SKILL.md with required frontmatter:
--- name: your-skill-name description: [Trigger-rich description] --- -
Validate using CHECKLIST.md
The Golden Rule: Description Is Everything
Claude uses the description field to decide when to apply your skill. A poor description means your skill never triggers.
Description Formula
[What it does] + [Specific capabilities] + [Trigger phrases]
Bad vs Good Descriptions
| Bad | Good |
|---|---|
| "Helps with testing" | "Write and run unit tests for TypeScript. Use when creating tests, mocking dependencies, or improving test coverage." |
| "Database helper" | "Generate SQL migrations and queries for PostgreSQL. Use when creating tables, writing queries, or migrating schemas." |
| "Code review" | "Review code for bugs, security issues, and style violations. Use when reviewing PRs, auditing code, or checking for vulnerabilities." |
Skill Structure
Minimal (Single File)
your-skill/
└── SKILL.md
Standard (With Supporting Docs)
your-skill/
├── SKILL.md # Overview + quick start (< 500 lines)
├── REFERENCE.md # Detailed documentation
├── EXAMPLES.md # Usage examples
└── CHECKLIST.md # Validation checklist
Advanced (With Scripts)
your-skill/
├── SKILL.md
├── docs/
│ ├── api.md
│ └── patterns.md
└── scripts/
├── setup.sh # Executed, not loaded as context
└── validate.py
What ships with it
3 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.
- 10d ago First seen · 170 lines · 46 tokens per session scan A 708cc38bfd3f
creating-skills is a skill published in the GitHub repository OneDro1d/dark-factory (0 stars, last pushed yesterday), licensed Apache-2.0. It adds 46 tokens to every session and 1,071 once invoked, about $0.0002 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 2026-09-01.
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