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writing-skills SKILL.md skillA

writing-skills from summerengine/summer is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add summerengine/summer/writing-skills@git:20261010.4ade947

Pins git:20261010.4ade947 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: summerengine/summer
Path: library/skills/writing-skills/SKILL.md
Versions recorded: 5
Latest version: git:20261010.4ade947, committed Oct 10, 2026
First version recorded: Sep 1, 2026
Size: 22,766 bytes
Repository stars: 86
License: MIT

Create, edit, and verify agent skills — format, structure, testing with subagents, and best practices.

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:** This skill adapts the RED-GREEN-REFACTOR cycle to documentation. The cycle: write the test first and watch it FAIL for the reason you expect (red), make the smallest change that passes it (green), then clean up without changing behaviour (refactor). A test you never saw fail proves nothing.

**Official guidance:** For Anthropic's official skill authoring best practices, see https://platform.claude.com/docs/en/agents-and-tools/agent-skills/best-practices. That document provides additional patterns and guidelines that complement the TDD-focused approach in this skill.

## What is a Skill?
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add summerengine/summer/writing-skills@sha256:402b075d38e76b69

The line at the top of this page pins the label git:20261010.4ade947, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_douak6uqzi3godsv.svg)](https://markdownregistry.com/a/art_douak6uqzi3godsv)

1 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 5 versions of this file, between Sep 1, 2026 and Oct 10, 2026, about one every 10 days.

version	committed	commit	size	audit
git:20261010.4ade947 latest	2026-10-10	4ade947	22,766 B	A	view · diff
git:20260911.b4df358	2026-09-11	b4df358	22,743 B	A	view · diff
git:20260910.4dc9f27	2026-09-10	4dc9f27	22,734 B	A	view · diff
git:20260902.548800b	2026-09-02	548800b	22,994 B	A	view · diff
git:20260901.5326d68	2026-09-01	5326d68	23,072 B	A	view

Audit of the latest version

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 (22766 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

summerengine/summer · 86 stars · license MIT · pushed 2026-10-20 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_douak6uqzi3godsv
GET https://markdownregistry.com/api/v1/resolve?ref=summerengine/summer/writing-skills
GET https://markdownregistry.com/api/v1/blob/402b075d38e76b6960bbe18aa915c7517ec39589194f76a432a1a733333ed252

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.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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