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Creating Skills

Creating Skills is a skill for Claude Code from obra/clank. It costs 20 tokens per session (4,080 once invoked), scanned A, original, no licence file.

A method for writing process documentation by testing it with other agents first. TDD normally means test-driven development, but here it means testing the documentation before finalising it.

In plain words
What is it for?
Creating, testing, and refining step-by-step instructions until they cover the process reliably.
Why use it?
It helps find unclear or incomplete instructions before other people rely on them.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter.

not rated 43repo +1 1y ago A scan 20 tokens no licence

Good fit Creating, testing, and refining step-by-step instructions until they cover the process reliably.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/obra/clank/creating-skills
View source ↗ obra/clank
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 obra/clank --skill creating-skills
Clone the repo
git clone --depth 1 https://github.com/obra/clank

Made for: Claude Code.

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 Creating Skills

README.md
[![agentmods](https://agentmods.dev/badge/skills/obra/clank/creating-skills/github.svg)](https://agentmods.dev/skills/obra/clank/creating-skills)
Your own site
<a href="https://agentmods.dev/skills/obra/clank/creating-skills"><img src="https://agentmods.dev/badge/skills/obra/clank/creating-skills/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.

agentmods 80×15 button for Creating Skills

Your own site · 80×15
<a href="https://agentmods.dev/skills/obra/clank/creating-skills"><img src="https://agentmods.dev/badge/skills/obra/clank/creating-skills.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,080 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.
Origin unknown 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 $0.00020 $0.04080
Opus 5.5 $0.00008 $0.01632
Sonnet 5.5 $0.00004 $0.00816
Haiku 4.5 $0.00002 $0.00408

Measured 2mo ago against content hash 6f4916f2a5d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Creating Skills 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 2mo 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/meta/creating-skills/SKILL.md · 586 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

1 file 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. 2mo ago First seen · 586 lines · 20 tokens per session scan A 6f4916f2a5d9

Subscribe to this mod's changes

Creating Skills is a skill published in the GitHub repository obra/clank (43 stars, last pushed 1y ago), with no licence file. It adds 20 tokens to every session and 4,080 once invoked, about $0.0001 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 2026-08-30.

Building agents
Related

Creating Skills compared with skills from other repositories

Creating Skills next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
Creating Skillsobra/clankSkill431y agononeA20Claude Code
imagegenopenai/codexSkill134ktodayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill100ktodayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k3d agoMITA200Claude Code, Codex
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
systematic-debuggingobra/superpowersSkill315k6d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code