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 bobmatnyc/claude-mpm-skills --skill skill-creatorgit clone --depth 1 https://github.com/bobmatnyc/claude-mpm-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/bobmatnyc/claude-mpm-skills/skill-creator)<a href="https://agentmods.dev/skills/bobmatnyc/claude-mpm-skills/skill-creator"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/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/bobmatnyc/claude-mpm-skills/skill-creator"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 5 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 10 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 79 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 11 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 72 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- high Rogue Agent · line 73 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
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 | $0.00009 | $0.02065 |
| Opus 5 | $0.00005 | $0.01033 |
| Sonnet 5 | $0.00002 | $0.00413 |
| Haiku 4.5 | $0.00001 | $0.00206 |
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 9d 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 — 192 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
Overview
Create effective skills that extend Claude's capabilities through specialized knowledge, workflows, and tools. Skills are modular packages that transform Claude from a general-purpose agent into a specialized agent with procedural knowledge for specific domains.
This skill exemplifies its own teachings by using progressive disclosure to keep the entry point lean while providing deep detail in reference files.
When to Use This Skill
Activate when:
- Creating a new skill from scratch
- Updating or refactoring an existing skill
- Adding progressive disclosure to monolithic skills
- Understanding skill structure and best practices
- Planning skill components (scripts, references, assets)
- Packaging skills for distribution
Core Principles
- Example-Driven Design: Start with concrete usage examples, not abstract concepts
- Progressive Disclosure: Keep entry point <200 lines (optimal: 140-160), detailed content in references
- Reusable Components: Extract scripts for repeated code, references for knowledge, assets for templates
- Imperative Voice: Use verb-first instructions throughout (not second person)
- Purpose-Built Resources: Each component should solve specific repetitive needs
What Skills Provide
Four Core Capabilities:
- Specialized workflows - Multi-step procedures for specific domains
- Tool integrations - Instructions for working with file formats or APIs
- Domain expertise - Company-specific knowledge, schemas, business logic
- Bundled resources - Scripts, references, and assets for complex tasks
Three-Level Loading System:
- Metadata (name + description) - Always in context (~100 words)
- SKILL.md body - When skill triggers (<200 lines, optimal: 140-160)
- Bundled resources - As needed by Claude (unlimited)
Quick Start
Six-Step Creation Process
Step 1: Understand with Concrete Examples Gather 3-5 realistic usage examples. Ask: "What would users say to trigger this skill?" and "What tasks should it accomplish?" → Complete guide
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.
- 9d ago First seen · 192 lines · 9 tokens per session scan A 08d97942ddd1
skill-creator is a skill published in the GitHub repository bobmatnyc/claude-mpm-skills (75 stars, last pushed 1mo ago), licensed MIT. It adds 9 tokens to every session and 2,065 once invoked, about $0.0000 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 2026-09-03.
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