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 agent-specific directories (`~/.claude/skills` for Claude Code, `~/.agents/skills/` for Codex)**
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.
**Official guidance:** For Anthropic's official skill authoring best practices, see anthropic-best-practices.md. This document provides additional patterns and guidelines that complement the TDD-focused approach in this skill.
## What is a Skill?
A **skill** is a reference guide for proven techniques, patterns, or tools. Skills help future Claude instances find and apply effective approaches.
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The line at the top of this page pins the label git:20260912.5e131e8, 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 (22624 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
xu123-bob/baize · 590 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7bgij22gkfc3fbwx
GET https://markdownregistry.com/api/v1/resolve?ref=xu123-bob/baize/writing-skills
GET https://markdownregistry.com/api/v1/blob/38ba648975ae6ba512d6695676f146163db61a496b867f716f4bdfb0ee3aca3e
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.
xu123-bob/baize · agent/skills/impeccable-skill-v3.9.1/impeccable/SKILL.md · Use when the user wants to design, redesign, shape, critique, audit, polish, clarify, distill, harden, optimize, adapt…
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/brainstorming/SKILL.md · You MUST use this before any creative work - creating features, building components, adding functionality, or modifying…
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/dispatching-parallel-agents/SKILL.md · Use when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/executing-plans/SKILL.md · Use when you have a written implementation plan to execute in a separate session with review checkpoints
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/finishing-a-development-branch/SKILL.md · Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides…
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/receiving-code-review/SKILL.md · Use when receiving code review feedback, before implementing suggestions, especially if feedback seems unclear or…
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/requesting-code-review/SKILL.md · Use when completing tasks, implementing major features, or before merging to verify work meets requirements
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/subagent-driven-development/SKILL.md · Use when executing implementation plans with independent tasks in the current session
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/systematic-debugging/SKILL.md · Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/test-driven-development/SKILL.md · Use when implementing any feature or bugfix, before writing implementation code
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/using-git-worktrees/SKILL.md · Use when starting feature work that needs isolation from current workspace or before executing implementation plans -…
xu123-bob/baize · agent/skills/superpowers/5.1.0/skills/using-superpowers/SKILL.md · Use when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY…
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
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
ed3dai/ed3d-plugins · plugins/ed3d-extending-claude/skills/writing-skills/SKILL.md · Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to…
