What is add-asset-type?

A workflow for adding a new kind of game asset from import through use in the editor and running game. An asset is a reusable file or document such as a texture, sound, model, or prefab.

Use it when adding an asset format, importer, generated file, or editor-created asset document.

It prevents an imported file from appearing to work while being missing from the asset browser, property picker, loader, or game runtime.

How andvolodko/html5-game-editor configures Cursor

Reuse

Borrowing it

Nothing to install: this file belongs to andvolodko/html5-game-editor. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/andvolodko/html5-game-editor/master/.cursor/skills/add-asset-type/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/andvolodko/html5-game-editor

Made for: Cursor.

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/andvolodko/html5-game-editor/add-asset-type/github.svg)](https://agentmods.dev/skills/andvolodko/html5-game-editor/add-asset-type)

Your own site

<a href="https://agentmods.dev/skills/andvolodko/html5-game-editor/add-asset-type"><img src="https://agentmods.dev/badge/skills/andvolodko/html5-game-editor/add-asset-type/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/andvolodko/html5-game-editor/add-asset-type"><img src="https://agentmods.dev/badge/skills/andvolodko/html5-game-editor/add-asset-type.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,120 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 original 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	$0.00065	$0.02120
Opus 5.5	$0.00026	$0.00848
Sonnet 5.5	$0.00013	$0.00424
Haiku 4.5	$0.00006	$0.00212

Measured 2mo ago against content hash fdaea6d5aac6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-asset-type 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 2mo 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.

.cursor/skills/add-asset-type/SKILL.md · 130 lines

How it starts

The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add Asset Type

Canonical workflow for a new catalogue asset kind. Scenes store stable assetIds (asset_…), never filesystem paths.

Scenes are not assets. Scene JSON lives at games/<name>/assets/scenes/<fileId>.json and is loaded via SceneFileService / import.meta.glob. Prefabs and TileSets are catalogue assets.

There is no first-class spritesheet AssetType. Packed sheets today come from Aseprite (.generated/ PNG+JSON) or from ordinary texture files.

When to use this skill

Adding a new AssetType / metadata kind.
Adding an importer (single file or multi-file bundle).
Adding an editor-created catalogue document (pattern: prefab, tileset) rather than a file drop.
Import succeeds but Browser / preview / Inspector / runtime cannot load it.

Do not use this for a new scene node that merely references an existing kind (that is .cursor/skills/add-node-type/SKILL.md).

Before changing code

Confirm the kind does not already exist in packages/assets/src/types.ts (AssetType).
Decide the creation path:

Path	Examples	Mechanism
Per-file import	texture, audio, webfont, glb, aseprite	`AssetImporter`
Multi-file bundle	spine, bitmap font, multi-file glTF	`AssetBundleImporter` (runs first)
Editor workflow	prefab, tileset	`editor-prefab-workflows.ts` / `editor-tileset-workflows.ts` + project-server file service — no drop importer

Read docs/assets.md. Aseprite-derived files: docs/aseprite.md. HTTP/path rules: .cursor/rules/server-security.mdc and docs/project-server.md.
Copy the closest existing kind end-to-end. Do not add a stub AssetType with no importer/metadata.

Current kinds: texture, spine, audio, gltf, aseprite, font, webfont, prefab, tileset.

Implementation workflow

1. Domain model

Extend AssetType and AssetMetadata in packages/assets/src/types.ts. Invariant: record.type === metadata.kind.
Extend Zod in packages/assets/src/schema.ts (assetTypeSchema, metadata union, assetRecordSchema).
Add createXAssetRecord in packages/assets/src/factories.ts.
Extension helpers live beside the others (texture-extensions.ts, audio-extensions.ts, spine-extensions.ts, gltf-extensions.ts, aseprite-extensions.ts, …).
Keep ASSET_SCHEMA_VERSION at 1 unless the manifest shape is incompatible — prefer optional fields / Zod .default() (see gltf animations).

Read the full file on GitHub · 130 lines

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.

2mo ago First seen · 130 lines · 65 tokens per session scan A fdaea6d5aac6

Subscribe to this mod's changes

add-asset-type is a skill published in the GitHub repository andvolodko/html5-game-editor (14 stars, last pushed 1mo ago), licensed MIT. It adds 65 tokens to every session and 2,120 once invoked, about $0.0003 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 2026-08-31.

2d 3d Game development editor game-development game-editor game-engine

add-asset-type next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
add-asset-typeandvolodko/html5-game-editor	Skill	14	1mo ago	MIT	A	65	Cursor
self-evolvetettethu/VibeGame	Skill	367	24d ago	Apache-2.0	A	50	Claude Code, Codex
artist-self-evolvetettethu/VibeGame	Skill	367	24d ago	Apache-2.0	A	62	Claude Code, Codex
vibegame-buildtettethu/VibeGame	Skill	367	24d ago	Apache-2.0	A	42	Claude Code, Codex
vibegame-starttettethu/VibeGame	Skill	367	24d ago	Apache-2.0	A	61	Claude Code, Codex
vibegame-edittettethu/VibeGame	Skill	367	24d ago	Apache-2.0	A	57	Claude Code, Codex
hearth-feelechoo19/hearth	Skill	44	1mo ago	MIT	A	97	Claude Code

html5-game-editor: Skill for Cursor