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 0xheycat/isometric-game-skills --skill transparent-cutout-cleanupgit clone --depth 1 https://github.com/0xheycat/isometric-game-skillsWrote 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/0xheycat/isometric-game-skills/transparent-cutout-cleanup)<a href="https://agentmods.dev/skills/0xheycat/isometric-game-skills/transparent-cutout-cleanup"><img src="https://agentmods.dev/badge/skills/0xheycat/isometric-game-skills/transparent-cutout-cleanup/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.
<a href="https://agentmods.dev/skills/0xheycat/isometric-game-skills/transparent-cutout-cleanup"><img src="https://agentmods.dev/badge/skills/0xheycat/isometric-game-skills/transparent-cutout-cleanup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00449 |
| Opus 5 | $0.00015 | $0.00225 |
| Sonnet 5 | $0.00006 | $0.00090 |
| Haiku 4.5 | $0.00003 | $0.00045 |
Grade A, and why
transparent-cutout-cleanup 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 13d 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.
What it actually says
Transparent Cutout Cleanup
Overview
AI-generated sprites come on a background. Naive removal leaves a colored halo or jagged edge that screams amateur when tiles are placed together. This skill produces clean, premultiplied-safe alpha cutouts.
When to Use
- Any generated sprite needs a transparent background.
- Placed sprites show a white/gray halo or fringe.
- Edges look jagged or have leftover background color.
Process
- Generate on a PLAIN flat background (easier to key out than a busy one).
- Use a background-removal model (e.g. InSPyReNet / rembg) rather than a hard color key.
- Inspect edges at 400% zoom for halo or fringe pixels.
- Defringe / decontaminate edge color so no background tint remains.
- Erode the alpha by 1px if a faint halo persists.
- Save as PNG with straight alpha; verify on both light and dark backgrounds.
- Batch the cleaned sprites for the atlas packer.
Pair this with the ComfyUI rembg node in seamless-isometric-terrain/scripts.
Rationalizations (Stop Lying to Yourself)
| Excuse | Reality |
|---|---|
| "A white halo is barely visible" | On a dark tile it is glaring. Defringe every sprite. |
| "Hard color-key is faster" | It eats anti-aliased edges and looks jagged. Use a proper matting model. |
Red Flags - STOP if you catch yourself:
- Visible halo/fringe when placed on a contrasting background.
- Jagged, aliased cutout edges.
- Background color contaminating semi-transparent pixels.
Verification
You are NOT done until every box is checked:
- Edges are clean at 400% zoom on light AND dark backgrounds.
- No background-color contamination on semi-transparent pixels.
- All sprites exported as straight-alpha PNG.
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.
- 13d ago First seen · 51 lines · 29 tokens per session scan A c425945a1019
transparent-cutout-cleanup is a skill published in the GitHub repository 0xheycat/isometric-game-skills (15 stars, last pushed 1mo ago), licensed MIT. It adds 29 tokens to every session and 449 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 2026-08-31.
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