skill-creator

skill-creator is a skill for Claude Code, Codex from Undertone0809/rudder. It costs 63 tokens per session (8,145 once invoked), scanned A, a copy of skill-creator, Apache-2.0.

A toolkit for creating, editing, and testing reusable instructions that guide a coding agent through specific tasks.

In plain words
What is it for?
Use it to draft or revise skills, create test prompts, measure results, compare performance, and improve how reliably a skill is selected.
Why use it?
It helps turn an informal idea into dependable instructions and reveals where those instructions need improvement.

Skill for Claude CodeCodex

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/undertone0809/rudder/skill-creator
Any agent
npx skills add Undertone0809/rudder --skill skill-creator
Clone the repo
git clone --depth 1 https://github.com/Undertone0809/rudder

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/undertone0809/rudder/skill-creator.svg)](https://agentmods.dev/skills/undertone0809/rudder/skill-creator)
Your own site
<a href="https://agentmods.dev/skills/undertone0809/rudder/skill-creator"><img src="https://agentmods.dev/badge/skills/undertone0809/rudder/skill-creator.svg" alt="Measured on agentmods" height="20"></a>
Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 8,145 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 80% copy Near-identical to another mod 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 $0.00063 $0.08145
Opus 5 $0.00032 $0.04072
Sonnet 5 $0.00013 $0.01629
Haiku 4.5 $0.00006 $0.00814

Measured 5d ago against content hash 36568af46f7f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 5d ago.

The scan reads SKILL.md. This mod also ships 11 executable files (eval-viewer/generate_review.py, scripts/__init__.py, scripts/aggregate_benchmark.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.

Origin

This is a copy

80% identical to skill-creator — 206 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

server/resources/bundled-skills/skill-creator/SKILL.md · 551 lines

How it starts

The opening of the file, as written. The whole thing — 551 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill Creator

A skill for creating new skills and iteratively improving them.

When running inside Rudder, read references/rudder.md as the default compatibility guide. Do not read a host-specific guide unless the user explicitly asks for provider-native compatibility, packaging, or evaluation, or asks to compare the same skill across hosts.

Outside Rudder, before host-sensitive work, read exactly one guide from references/compatibility/: claudecode.md, codex.md, or other.md. Read more than one only when packaging or evaluating the same skill across multiple hosts.

At a high level, the process of creating a skill goes like this:

  • Decide what you want the skill to do and roughly how it should do it
  • Write a draft of the skill
  • Create a few test prompts and run them in an agent session that has access to the skill
  • Help the user evaluate the results both qualitatively and quantitatively
    • While the runs happen in the background, draft some quantitative evals if there aren't any (if there are some, you can either use as is or modify if you feel something needs to change about them). Then explain them to the user (or if they already existed, explain the ones that already exist)
    • Use the eval-viewer/generate_review.py script to show the user the results for them to look at, and also let them look at the quantitative metrics
  • Rewrite the skill based on feedback from the user's evaluation of the results (and also if there are any glaring flaws that become apparent from the quantitative benchmarks)
  • Repeat until you're satisfied
  • Expand the test set and try again at larger scale

Your job when using this skill is to figure out where the user is in this process and then jump in and help them progress through these stages. So for instance, maybe they're like "I want to make a skill for X". You can help narrow down what they mean, write a draft, write the test cases, figure out how they want to evaluate, run all the prompts, and repeat.

On the other hand, maybe they already have a draft of the skill. In this case you can go straight to the eval/iterate part of the loop.

Of course, you should always be flexible and if the user is like "I don't need to run a bunch of evaluations, just vibe with me", you can do that instead.

Then after the skill is done (but again, the order is flexible), you can also run the skill description improver, which we have a whole separate script for, to optimize the triggering of the skill.

Cool? Cool.

Read the full file on GitHub · 551 lines

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. 5d ago First seen · 551 lines · 63 tokens per session scan A 36568af46f7f

Subscribe to this mod's changes

skill-creator is a skill published in the GitHub repository Undertone0809/rudder (288 stars, last pushed today), licensed Apache-2.0. It adds 63 tokens to every session and 8,145 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 80% identical to skill-creator, differing in 206 lines, and is treated as a copy.

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