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mcp/skillhub

Agent Skill

Hatch Pet skill

hatch-petOpenAI Skillsskills/.curated/hatch-pet/SKILL.md

Create, repair, validate, visually QA, and package Codex-compatible animated pets and pet spritesheets from character art, generated images, company or prospect brand cues, or visual references. Use when a user wants a lightweight-worker Codex pet workflow, a non-pixel custom pet style, a prospect or company mascot pet, or a full 8x9 animated pet atlas with transparent unused cells, QA contact sheets, and pet.json packaging. This skill composes the installed $imagegen system skill for visual generation and uses bundled scripts for deterministic spritesheet assembly.

28kofficial repo

always on

118 tokname + description

once used

8,104 tokSKILL.md body

bundled files

138 scripts

repo stars

28kGitHub

Install the Hatch Pet skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/openai/skills --skill hatch-pet

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/openai/skills.git /tmp/skills
mkdir -p ~/.claude/skills
cp -R /tmp/skills/skills/.curated/hatch-pet ~/.claude/skills/hatch-pet

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

WhenWhat loadsCost
Every sessionName and description118 tok
When the agent uses itThe SKILL.md instructions8,104 tok
Only if opened13 bundled files (93 KB)varies

Until it is used, hatch-pet costs about 12× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 44 skills from openai/skills would load 2,975 tokens of descriptions. Skills vs MCP study

Checks

  • Ships scripts the agent can run. Read them before installing.
  • The instructions are over 5,000 tokens, the Agent Skills specification's guideline for SKILL.md.
  • The instructions are over 500 lines; the specification suggests moving detail into reference files.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

  • Hatch Pet
  • Overview
  • Generation Delegation
  • Storage Controls
  • Brand Discovery
  • Pet-Safe Styles
  • Transparency And Effects
  • Visible Progress Plan
  • Default Workflow
  • Lightweight Visual Workers
  • Subagent Delegation
  • Repair Workflow
  • Rules
  • Acceptance Criteria

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