A workflow for creating animated pet spritesheets that Codex can use. A spritesheet is one image containing multiple animation frames; this workflow supports character art, screenshots, generated images, and visual references.

Use it to create a custom Codex pet, fix an existing animated pet, or prepare a built-in pet asset.

It helps repair, check, preview, and package pet animations in the required format, including an 8-by-9 frame layout and transparent unused cells.

hatch-pet — Skill for Codex by antoniolg/agent-kit

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add antoniolg/agent-kit --skill hatch-pet

Clone the repo

git clone --depth 1 https://github.com/antoniolg/agent-kit

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/antoniolg/agent-kit/hatch-pet/github.svg)](https://agentmods.dev/skills/antoniolg/agent-kit/hatch-pet)

Your own site

<a href="https://agentmods.dev/skills/antoniolg/agent-kit/hatch-pet"><img src="https://agentmods.dev/badge/skills/antoniolg/agent-kit/hatch-pet/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/antoniolg/agent-kit/hatch-pet"><img src="https://agentmods.dev/badge/skills/antoniolg/agent-kit/hatch-pet.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 114 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,922 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00114	$0.04922
Opus 5.5	$0.00046	$0.01969
Sonnet 5.5	$0.00023	$0.00984
Haiku 4.5	$0.00011	$0.00492

Measured 1mo ago against content hash d35d29c17047, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hatch-pet scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

The scan reads SKILL.md. This mod also ships 15 executable files (scripts/compose_atlas.py, scripts/derive_running_left_from_running_right.py, scripts/extract_strip_frames.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/hatch-pet/SKILL.md · 321 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

20 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 321 lines · 114 tokens per session scan A d35d29c17047

Subscribe to this mod's changes

hatch-pet is a skill published in the GitHub repository antoniolg/agent-kit (100 stars, last pushed 5mo ago), with no licence file. It adds 114 tokens to every session and 4,922 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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