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 jnPiyush/AgentX --skill skill-creatorgit clone --depth 1 https://github.com/jnPiyush/AgentXWrote 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/jnpiyush/agentx/skill-creator)<a href="https://agentmods.dev/skills/jnpiyush/agentx/skill-creator"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/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/jnpiyush/agentx/skill-creator"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/skill-creator.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 | $0.00047 | $0.02085 |
| Opus 5.5 | $0.00019 | $0.00834 |
| Sonnet 5.5 | $0.00009 | $0.00417 |
| Haiku 4.5 | $0.00005 | $0.00209 |
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 20d 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 — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
Create, validate, and maintain skills that follow the agentskills.io open specification.
When to Use
- Creating a new skill from scratch
- Auditing existing skills for spec compliance
- Restructuring a skill for progressive disclosure
- Adding scripts/, references/, or assets/ to an existing skill
Knowledge vs Execution Principle
Choose the implementation by the kind of work:
| Problem Type | Solution | Example |
|---|---|---|
| Knowledge (stable knowledge, changing weekly/monthly) | Skill (Markdown) | Coding standards, triage workflows, deployment conventions |
| Execution (live API call at runtime) | MCP Server | Query a database, create a GitHub issue, send an email |
| Hybrid (both) | Skill orchestrating subordinate MCP tools | Skill encodes workflow + judgment; MCP provides API calls |
Standalone Principle: Every skill SHOULD produce useful output without MCP connections. If disconnecting all MCP servers makes the skill non-functional, the knowledge layer is not properly separated from the execution layer.
Decision Tree
Need to work on a skill?
+- Creating new skill?
| +- Run: scripts/init-skill.ps1
| - Fill in SKILL.md template
+- Auditing existing skill?
| +- Check frontmatter against spec (see Frontmatter Rules)
| +- Check line count (target < 500, ideal < 350)
| - Verify progressive disclosure structure
+- Skill too large (> 500 lines)?
| +- Extract detailed examples -> references/
| +- Extract executable logic -> scripts/
| - Keep SKILL.md as slim router
- Adding capability to existing skill?
+- Executable automation -> scripts/
+- Extended docs/examples -> references/
- Templates, starter code, sample data -> assets/
Quick Start: Create a New Skill
# Scaffold a new skill with all directories
./.github/skills/development/skill-creator/scripts/init-skill.ps1 `
-Name "my-new-skill" `
-Category "development" `
-Description "Brief description of the skill" `
-WithScripts -WithReferences
What ships with it
2 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.
- 20d ago Changed · -5 lines 75f7497b7cf9
- 23d ago Changed · -14 lines 71aaeefacf47
- 1mo ago Changed · -1 tokens per session e2569b0b58a5
- 1mo ago First seen · 232 lines · 48 tokens per session scan A b5454d82a99c
skill-creator is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 47 tokens to every session and 2,085 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 2026-09-03.
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