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hatch-pet

Create, repair, validate, preview, and package Codex-compatible animated pet spritesheets from character art, screenshots, generated images, or visual references. Use when a user wants to hatch a Codex pet, create a custom animated pet, or build a built-in pet asset with an 8x9 atlas, transparent unused cells, row-by-row animation prompts, QA contact sheets, preview videos, and pet.json packaging. This skill composes the installed $imagegen system skill for visual generation and uses bundled scripts for deterministic spritesheet assembly.

packages/content/assets/open-design/skills/hatch-pet/SKILL.md

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Last checked
Nov 4, 2026

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1,045
Repository last updated
Nov 7, 2026
License
MIT

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# Hatch Pet

> **OpenDesign integration.** This is the unmodified Codex `hatch-pet` skill,
> vendored under `skills/hatch-pet/` so any OpenDesign agent can run it. After
> the skill finishes packaging, the resulting `spritesheet.webp` (under
> `${CODEX_HOME:-$HOME/.codex}/pets/<pet-name>/`) can be imported into the
> floating pet companion via **Settings → General → Pets → Import Codex sprite**. The
> import flow auto-detects the 8×9 / `192×208` atlas and lets the user pick
> which animation row to play (idle, running-right, waving, …).


## Overview

Create a Codex-compatible animated pet from a concept, one or more reference images, or both. This skill owns pet-specific prompt planning, animation rows, frame extraction, atlas geometry, QA, previews, and packaging. It delegates visual generation to `$imagegen`.