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Hatch Pet

nexu-io/open-design

Turns text prompts or reference images into full 8x9 animated spritesheets for Codex pets, complete with idle, running, jumping, waving, and failure states. It handles the whole pipeline: generating base art, producing nine animation rows via the imagegen skill, extracting frames, composing the atlas with transparent cells, running QA contact sheets, and packaging everything into pet.json. The workflow is surprisingly rigid about grounding every row in the generated base reference and enforcing a specific pixel-art house style with thick outlines and no floating effects. If you need a custom digital pet with proper animation rows and you're willing to burn ten image generation calls, this will save you from manually slicing frames and guessing atlas geometry.

skills.sh installs
3.2K
GitHub stars
106.9K
last updated
Aug 21, 2026
View on GitHub

Install

$ npx -y skills add nexu-io/open-design --skill hatch-pet --agent claude-code

Installs into .claude/skills of the current project.

Files

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.

SKILL.md on GitHub

Sponsors

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Details

Repository
github.com/nexu-io/open-design
Categories
Testing & QA, DevOps & CI/CD, Design & UI/UX
First seen
Jun 3, 2026

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