skill-creator

skill-creator is a skill for Claude Code, Codex from Threat-Vector-Security/guardian-agent. It costs 51 tokens per session (716 once invoked), scanned A, original, Apache-2.0.

A guide for turning a repeatable workflow into a skill for a coding agent, or improving one that already exists. It covers when the skill should activate, how it should work, and how to test its quality.

In plain words
What is it for?
Use it to create, revise, evaluate, or benchmark agent skills, including their instructions and trigger descriptions.
Why use it?
It gives structure to skill design so skills are easier to trigger correctly and less likely to produce inconsistent results.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

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.

agentmods
npx agentmods add skills/threat-vector-security/guardian-agent/skill-creator
Any agent
npx skills add Threat-Vector-Security/guardian-agent --skill skill-creator
Clone the repo
git clone --depth 1 https://github.com/Threat-Vector-Security/guardian-agent

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.

agentmods badge for skill-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/threat-vector-security/guardian-agent/skill-creator.svg)](https://agentmods.dev/skills/threat-vector-security/guardian-agent/skill-creator)
Your own site
<a href="https://agentmods.dev/skills/threat-vector-security/guardian-agent/skill-creator"><img src="https://agentmods.dev/badge/skills/threat-vector-security/guardian-agent/skill-creator.svg" alt="Measured on agentmods" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 716 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00051 $0.00716
Opus 5 $0.00026 $0.00358
Sonnet 5 $0.00010 $0.00143
Haiku 4.5 $0.00005 $0.00072

Measured 6d ago against content hash c389851b90c2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, 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 6d 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.

skills/skill-creator/SKILL.md · 68 lines

How it starts

The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Creator

Treat skill work as an eval-driven workflow: understand real usage, draft the skill, test trigger behavior, compare against baseline behavior, and refine it.

Start With Intent

Extract as much as possible from the current conversation before asking for more:

  • what the skill should help with
  • when it should trigger
  • what good output looks like
  • whether the task needs deterministic evals or mostly qualitative review

When the workflow is still vague, capture 2-3 realistic user prompts before writing the skill.

Drafting Rules

  • Put trigger guidance in the frontmatter description, not only in the body.
  • Make the description describe when to use the skill, not the full workflow inside the skill.
  • Prefer trigger symptoms and task conditions over abstract labels.
  • Keep the skill body procedural and easy to scan.
  • Move large supporting material into references/, templates/, or examples/.
  • Keep SKILL.md focused on the workflow. Put heavy reference content in references/.
  • If the skill is imported or adapted from a third-party source, preserve provenance and license notices in THIRD_PARTY_NOTICES.md.

Trigger Authoring

  • Write the description as activation guidance, not marketing copy.
  • Treat the description field as model-facing trigger text; keep it high-signal because the runtime scores it alongside explicit keywords.
  • Include the user signals that should cause the skill to trigger.
  • Include nearby non-trigger cases when they are easy to confuse.
  • Prefer concrete request language over broad nouns like "help", "workflow", or "tool".
  • Keep automatically matched keywords narrow; generic words create noisy false positives.
  • If the skill should rarely auto-select, prefer explicit mention and description fallback over a wide keyword list.

Improvement Loop

  1. Draft or revise the skill.
  2. Write 2-3 realistic test prompts.
  3. Compare with-skill behavior against a baseline when possible.
  4. Check two things separately:
    • Did the skill trigger when it should?
    • Did the full skill body improve behavior after triggering?
  5. Capture what improved, what regressed, and what still feels vague.
  6. Tighten the description and instructions, then test again.

Read the full file on GitHub · 68 lines

Files

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.

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.

  1. 6d ago First seen · 68 lines · 51 tokens per session scan A c389851b90c2

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository Threat-Vector-Security/guardian-agent (11 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 51 tokens to every session and 716 once invoked, about $0.0003 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 2026-08-30.

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