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.
npx skills add gvastethecreator/codex-studio --skill sprite-atlas-buildergit clone --depth 1 https://github.com/gvastethecreator/codex-studioWrote 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.
[](https://agentmods.dev/skills/gvastethecreator/codex-studio/sprite-atlas-builder)<a href="https://agentmods.dev/skills/gvastethecreator/codex-studio/sprite-atlas-builder"><img src="https://agentmods.dev/badge/skills/gvastethecreator/codex-studio/sprite-atlas-builder.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00029 | $0.01827 |
| Opus 5 | $0.00015 | $0.00914 |
| Sonnet 5 | $0.00006 | $0.00365 |
| Haiku 4.5 | $0.00003 | $0.00183 |
Grade A, and why
sprite-atlas-builder 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 8d ago.
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.
How it starts
The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sprite Atlas Builder
Overview
Build sprites and game asset sheets with the component-row pipeline:
preset/custom contract -> sprite-request.json -> layout guides + row prompts
-> imagegen row strips -> chroma/rembg background removal + component extraction
-> curated frames -> atlas PNG + manifest.json.frame_layout
Use $imagegen for visual generation. Use local scripts for deterministic request prep, background removal, extraction, atlas composition, previews, curation, unpacking, and exports.
Mandatory Imagegen Rule
$imagegen is the internal visual-generation sub-skill and the primary art engine for this skill.
sprite-atlas-builder owns contracts, prompts, layout guides, extraction, registration, atlas composition, previews, curation, and QA.
$imagegen owns bitmap creation.
For any user-facing sprite, character, tileset, texture, prop, icon, VFX, or atlas art generation, use $imagegen whenever it is available.
Load and follow the $imagegen skill rules for generation or editing, save-path handling, chroma-key transparency, and output honesty.
Local scripted or PIL drawing is allowed only for deterministic smoke tests, regression fixtures, geometry debugging, or when $imagegen is unavailable.
If local drawing is used for anything beyond a fixture, say so explicitly.
Do not present it as an imagegen-backed art validation.
Pipeline validation for generated art must include at least one $imagegen-produced source image or row strip before calling the result visually representative.
The local scripts can prepare prompts, guides, extraction, atlas composition, previews, and QA.
They do not replace $imagegen for final visual content.
When $imagegen outputs are meant for the project, copy or move the selected generated image into the run folder before extraction.
Do not leave project-referenced row art only under $CODEX_HOME.
Requires Python with Pillow available. rembg is optional for local model-backed background removal.
What ships with it
3 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.
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.
- 8d ago First seen · 136 lines · 29 tokens per session scan A 475dc67ab089
sprite-atlas-builder is a skill published in the GitHub repository gvastethecreator/codex-studio (12 stars, last pushed 9d ago), licensed MIT. It adds 29 tokens to every session and 1,827 once invoked, about $0.0001 per session on Opus 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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