Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
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
# Skill Creator
This skill provides guidance for creating effective skills.
## About Skills
Skills are modular, self-contained packages that extend Codex's capabilities by providing
specialized knowledge, workflows, and tools. Think of them as "onboarding guides" for specific
domains or tasks—they transform Codex from a general-purpose agent into a specialized agent
equipped with procedural knowledge that no model can fully possess.
### What Skills Provide
1. Specialized workflows - Multi-step procedures for specific domains
2. Tool integrations - Instructions for working with specific file formats or APIs
3. Domain expertise - Company-specific knowledge, schemas, business logic
4. Bundled resources - Scripts, references, and assets for complex and repetitive tasks
## Core Principles
### Concise is Key
The context window is a public good. Skills share the context window with everything else Codex needs: system prompt, conversation history, other Skills' metadata, and the actual user request.
…
The line at the top of this page pins the label git:20260131.fc29eb0, 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 (18356 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
metaspartan/cybara · 32 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_oslspgug55s2terg
GET https://markdownregistry.com/api/v1/resolve?ref=metaspartan/cybara/skill-creator
GET https://markdownregistry.com/api/v1/blob/4afbad1d930d98a0610f09bbf810f8a49de7b3187a7050d7974c3b600ae83c90
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.
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metaspartan/cybara · plugins/game-development/skills/game-networking/SKILL.md · Design, implement, test, secure, and profile multiplayer game networking across engines, including authority…
metaspartan/cybara · plugins/game-development/skills/game-playtesting/SKILL.md · Test a game end to end like a player across boot, controls, gameplay loops, UI, save state, failure recovery…
anthropics/skills · skills/skill-creator/SKILL.md · Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a…
bytedance/deer-flow · skills/public/skill-creator/SKILL.md · Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a…
cherryhq/cherry-studio · resources/skills/skill-creator/SKILL.md · Create, edit, evaluate, and optimize skills, including benchmarking and description tuning for better triggering.
anthropics/claude-plugins-official · plugins/skill-creator/skills/skill-creator/SKILL.md · Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a…
volcengine/openviking · bot/workspace/skills/skill-creator/SKILL.md · Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
garrytan/gbrain · plugin/skills/skill-creator/SKILL.md · Create new skills following the GBrain conformance standard. Generates SKILL.md
with frontmatter, Contract, Phases…
garrytan/gbrain · skills/skill-creator/SKILL.md · Create new skills following the GBrain conformance standard. Generates SKILL.md
with frontmatter, Contract, Phases…
eigent-ai/eigent · resources/example-skills/skill-creator/SKILL.md · Guide for creating effective skills. Use when creating a new skill or updating an existing skill that extends agent…
