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 SummerEngine/summer-engine-agent --skill create-asset-sheetgit clone --depth 1 https://github.com/SummerEngine/summer-engine-agentWrote 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/summerengine/summer-engine-agent/create-asset-sheet)<a href="https://agentmods.dev/skills/summerengine/summer-engine-agent/create-asset-sheet"><img src="https://agentmods.dev/badge/skills/summerengine/summer-engine-agent/create-asset-sheet/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/summerengine/summer-engine-agent/create-asset-sheet"><img src="https://agentmods.dev/badge/skills/summerengine/summer-engine-agent/create-asset-sheet.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00121 | $0.02164 |
| Opus 5 | $0.00060 | $0.01082 |
| Sonnet 5 | $0.00024 | $0.00433 |
| Haiku 4.5 | $0.00012 | $0.00216 |
Grade A, and why
create-asset-sheet 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 9d 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 — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.
create-asset-sheet — Generate a coherent pack of 2D assets
This skill turns a single prompt into a categorized pack of isolated, named 2D assets ready to drop into a game. It exists because the alternative — generating each asset one-by-one, then losing visual coherence between them, then manually matting backgrounds in Photoshop — is the most-cited pain point from indie devs working with image models in 2026.
Pipeline:
- Generate a sheet of N isolated assets in one image-gen call.
- Remove background (fal/bria) so each asset can stand on its own.
- Detect + name + classify each asset in one vision call (Gemini 3 Pro outputs bbox + snake_case name + category per region).
- Crop each region with sharp.
- Optionally upscale any small slice via fal flux-2/edit i2i, preserving aspect.
- Save as a single pack ArtAsset with
packFiles: [{url, name, type}]andmetadata.sliceBboxes.
Categories the classifier outputs (used to route into downstream pipelines):
character | terrain | nature | lighting | water | decorative | buildings | ui | vfx
When to use
- "Make me a Japanese village tileset."
- "Generate a sci-fi UI kit — buttons, panels, icons."
- "I need 12 fantasy props for a dungeon — chest, torch, skeleton, gold, etc."
- "Give me a character pack: 6 cute monsters."
- "Build a forest biome — trees, rocks, plants, ground tiles."
When NOT to use
- The user wants a single asset →
summer:2d-assets/pixel-artorsummer:2d-assets/character-portrait. - The user wants character animation (walk cycle, attack frames) →
summer:2d-assets/sprite-sheet. - The user wants 3D models of a planned pack → not yet supported in one shot; loop
summer:2d-assets/concept-art→ image-to-3D per item, or usesummer:asset-pipeline/asset-strategyto pick the right path. - The user wants terrain tiles that connect seamlessly (auto-tiling / Wang tiles) →
summer:2d-assets/tileable-textureis the right home for edge logic; this skill produces standalone tiles, not edge variants.
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.
- 9d ago First seen · 166 lines · 121 tokens per session scan A 3b4fa7160a20
create-asset-sheet is a skill published in the GitHub repository SummerEngine/summer-engine-agent (59 stars, last pushed today), licensed MIT. It adds 121 tokens to every session and 2,164 once invoked, about $0.0006 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
artist-self-evolve
Distill stable art-generation patterns from a completed project, so future projects produce comparable assets without re-discovering the prompts. Lead-dispatched only — orchestrator invokes this skill from its self-evolve flow with a game-slug message; do not self-trigger.
vibegame-edit
Iterate broadly on an existing game, on top of vibegame-build. Use when the user asks to change an existing game's art style, genre, or core rules. Not for local tuning such as numbers or game feel. Orchestrator only.
hearth-art
Give a Hearth game real art and sound — importing and slicing spritesheets, animations, procedural sprites and sounds, autonomous CC0 asset sourcing (Kenney, itch.io, OpenGameArt, Freesound, Google Fonts) with licensing rules, and pixel-art discipline (never stretch; read the art before using it). Use when the game…
asset-gen
Generate visual assets from text prompts: PNG images (Gemini / xAI Grok), GLB 3D models (Tripo3D), rigged biped characters, retargeted animations, and frame-by-frame animated sprites, plus background removal. Use whenever a game needs generated art.
screenshot-isolated
Render a target GameObject from a chosen camera angle with optional layer-based isolation, configurable background (solid/skybox/transparent), multi-light setup via JSON, and Composite (2x2 Front/Right/Back/Top) mode. Returns a PNG image. When isolated=true, inactive children may briefly fire OnEnable — see the body…
screenshot-camera
Capture a screenshot from a Unity Camera and return it as a PNG image for direct LLM inspection. Falls back to Camera.main (then any active camera) when cameraRef is null. Width and height are capped to keep response size manageable.