What is skill-creator?

A guide and toolkit for creating SKILL.md files, which teach coding agents how to perform specific tasks. It covers writing instructions, defining triggers, validating, packaging, and publishing skills.

Use it to create or update agent add-ons, write their trigger descriptions, validate their files, and package or publish them.

It helps keep agent instructions concise, discoverable, and dependable. It also provides checks and workflows for maintaining skills over time.

skill-creator — Skill for Claude Code and Codex by HybridAIOne

Install

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.

Any agent

npx skills add HybridAIOne/hybridclaw --skill skill-creator

Clone the repo

git clone --depth 1 https://github.com/HybridAIOne/hybridclaw

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/hybridaione/hybridclaw/skill-creator/github.svg)](https://agentmods.dev/skills/hybridaione/hybridclaw/skill-creator)

Your own site

<a href="https://agentmods.dev/skills/hybridaione/hybridclaw/skill-creator"><img src="https://agentmods.dev/badge/skills/hybridaione/hybridclaw/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/hybridaione/hybridclaw/skill-creator"><img src="https://agentmods.dev/badge/skills/hybridaione/hybridclaw/skill-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,704 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 3 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 3
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 9
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.
medium Rogue Agent · line 3
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00032	$0.01704
Opus 5	$0.00016	$0.00852
Sonnet 5	$0.00006	$0.00341
Haiku 4.5	$0.00003	$0.00170

Measured 9d ago against content hash 0de8cbe9bbd3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

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.

The scan reads SKILL.md. This mod also ships 5 executable files (scripts/generate_openai_yaml.py, scripts/init_skill.py, scripts/package_skill.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/skill-creator/SKILL.md · 251 lines

How it starts

The opening of the file, as written. The whole thing — 251 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Creator

Build high-quality skills that are clear to trigger, cheap in context, and reliable in execution.

Core Principles

1) Concise is a hard requirement

Assume the model already knows general concepts. Include only information that improves outcomes for this specific skill.

Prefer short imperative instructions over essays.
Keep essential workflow in SKILL.md.
Move deep detail into references/.

2) Set the right degrees of freedom

Pick guidance strictness by task fragility:

High freedom: heuristics and decision rules.
Medium freedom: parameterized scripts and pseudocode.
Low freedom: exact commands and narrow steps.

Use low freedom when consistency and safety matter; allow higher freedom when multiple valid approaches exist.

3) Design for progressive disclosure

Skills should load in layers:

Frontmatter name + description (always loaded)
SKILL.md body (loaded on trigger)
references/, scripts/, assets/ (loaded only when needed)

Target sizes:

SKILL.md body: 1,500-2,000 words
references/*: 2,000-5,000+ words when needed
Keep SKILL.md under ~500 lines; split earlier if it grows fast

Anatomy of a Skill

Required:

SKILL.md
YAML frontmatter with name, description, and metadata.hybridclaw.category

Recommended:

agents/openai.yaml for UI-facing metadata

Optional:

scripts/ for deterministic or repeated operations
references/ for deep guidance and domain details
assets/ for templates/images/files used in outputs
license.txt when sharing externally

For API-backed skills, prefer deterministic *.cjs scripts that provide an easy CLI over the external API. The script should own endpoint selection, methods, payload shaping, URL encoding, write-tier classification, and secret reference construction, then emit gateway-ready JSON for the model to pass to tools such as http_request. The model should run the CLI and use its emitted request objects instead of handcrafting API calls from memory.

Read the full file on GitHub · 251 lines

Files

What ships with it

10 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.

Changes

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 · 251 lines · 32 tokens per session scan A 0de8cbe9bbd3

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository HybridAIOne/hybridclaw (132 stars, last pushed yesterday), licensed MIT. It adds 32 tokens to every session and 1,704 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 2026-09-03.

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