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 Yuki001/game-dev-skills --skill gat-designgit clone --depth 1 https://github.com/Yuki001/game-dev-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/yuki001/game-dev-skills/gat-design)<a href="https://agentmods.dev/skills/yuki001/game-dev-skills/gat-design"><img src="https://agentmods.dev/badge/skills/yuki001/game-dev-skills/gat-design/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/yuki001/game-dev-skills/gat-design"><img src="https://agentmods.dev/badge/skills/yuki001/game-dev-skills/gat-design.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 | $0.00044 | $0.02006 |
| Opus 5 | $0.00022 | $0.01003 |
| Sonnet 5 | $0.00009 | $0.00401 |
| Haiku 4.5 | $0.00004 | $0.00201 |
Grade A, and why
gat-design 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 11d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 11d ago First seen · 153 lines · 44 tokens per session scan A 898c5a359d14
gat-design is a skill published in the GitHub repository Yuki001/game-dev-skills (68 stars, last pushed 16d ago), with no licence file. It adds 44 tokens to every session and 2,006 once invoked, about $0.0002 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.
Other skills, from other repositories
game-developer
Use when building game systems, implementing Unity/Unreal Engine features, or optimizing game performance. Invoke to implement ECS architecture, configure physics systems and colliders, set up multiplayer networking with lag compensation, optimize frame rates to 60+ FPS targets, develop shaders, or apply game design…
pufferlib
Version-aware guidance for PufferLib reinforcement-learning environments, vectorization, policies, PuffeRL training, evaluation, and safe checkpoint review. Use when adapting Gymnasium/PettingZoo environments to published PufferLib 3.0.0 or working with the redesigned native 4.0 source line.
build-world
Builds polished, fully playable 3D game prototypes in Unity, Roblox, or three.js with high-quality (.glb) meshes from the Thrixel API, and publishes finished games to a public thrixel.world link that anyone can play in a browser. Use when the user wants to make a game, build a playable prototype, or generate 3D assets…
game-builder
Convert any topic into playable browser games. Types: trivia, matching, word puzzles, adventure games. Uses Phaser.js or Kaboom.js.
image-to-3d
Turn a generated or photographed image of a single object into a 3D mesh with the Tripo API, and download the GLB. Use when the request involves image-to-3D, photogrammetry-style reconstruction, turning a product shot or an isolated garment, prop or piece of hardware into a model for Blender, Unity or Unreal, or when…
character-reference-sheets
Dress 3D character base renders with AI-generated clothing while preserving the body, pose and framing, so each garment can be cut out and sent to image-to-3D generators. Use when the request involves a Blender base render in A-pose or T-pose, a character visual sheet, a turnaround, generating clothing over a nude…