Use when creating new skills, editing existing skills, or verifying skills work before deployment.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Writing Skills
## Overview
**Writing skills IS Test-Driven Development applied to process documentation.**
**Personal skills live in your runtime's skills directory** (`~/.claude/skills/` on Claude Code) — see [codex-tools.md](../using-superpowers/references/codex-tools.md) or [gemini-tools.md](../using-superpowers/references/gemini-tools.md) for the path on those runtimes. Codex, Copilot CLI, and Gemini CLI all also recognize `~/.agents/skills/` as a cross-runtime alias.
You write test cases (pressure scenarios with subagents), watch them fail (baseline behavior), write the skill (documentation), watch tests pass (agents comply), and refactor (close loopholes).
**Core principle:** If you didn't watch an agent fail without the skill, you don't know if the skill teaches the right thing.
**REQUIRED BACKGROUND:** You MUST understand superpowers:test-driven-development before using this skill. That skill defines the fundamental RED-GREEN-REFACTOR cycle. This skill adapts TDD to documentation.
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The line at the top of this page pins the label git:20260927.e6d3d84, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (26623 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
osrim/niksi · 9 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3zv5qecgkvjblttn
GET https://markdownregistry.com/api/v1/resolve?ref=osrim/niksi/writing-skills
GET https://markdownregistry.com/api/v1/blob/bbdfe742f853562e643a3d40d64476359d47881e39cef80a189283fa26d11ab9
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/academy-guide/SKILL.md · Stop and check this skill before finishing any reply to a question about how to use Claude or a Claude product — it…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/algorithmic-art/SKILL.md · Creating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/brand-guidelines/SKILL.md · Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/discernment-nudge/SKILL.md · After you give a substantive answer or draft that the user may act on — advice or recommendations, drafted artifacts…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/frontend-design/SKILL.md · Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/internal-comms/SKILL.md · A set of resources to help me write all kinds of internal communications, using the formats that my company likes to…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/mcp-builder/SKILL.md · Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/skill-creator/SKILL.md · Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a…
osrim/niksi · cli/testdata/benign-skills/anthropic-skills/theme-factory/SKILL.md · Toolkit for styling artifacts with a theme. These artifacts can be slides, docs, reportings, HTML landing pages, etc…
a5c-ai/babysitter · library/methodologies/superpowers/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment.
coco-research/coco · skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
jamditis/claude-skills-journalism · superjawn/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
ibrahim-3d/orchestrator-supaconductor · skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment
