What is implement-runtime-feature?

A guide for adding gameplay and other running-game features to a game runtime, separate from editor screens and controls.

Use it for audio, input, timers, scene changes, asset loading, script lifecycle, spawning, and other shared game-runtime behavior.

It keeps runtime code independent from the editor, making shared systems safer to use in previews and standalone games.

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/implement-runtime-feature/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/implement-runtime-feature/github.svg)](https://agentmods.dev/skills/andvolodko/html5-game-editor/implement-runtime-feature)

Your own site

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

Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,564 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	$0.00055	$0.01564
Opus 5.5	$0.00022	$0.00626
Sonnet 5.5	$0.00011	$0.00313
Haiku 4.5	$0.00006	$0.00156

Measured 2mo ago against content hash 76b96875a306, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

implement-runtime-feature 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/implement-runtime-feature/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Implement Runtime Feature

Counterpart to .cursor/skills/implement-editor-feature/SKILL.md for work that ships in games, not the editor shell.

New Script components (defineComponent + behaviour class): use .cursor/skills/create-game-component/SKILL.md instead — do not duplicate that OOP/catalog checklist here.

New independently buildable game package: .cursor/skills/create-game/SKILL.md.

When to use this skill

Gameplay services on GameRuntime / ScriptRuntimeServices (audio, preload, spawn, scene change, pointer forwarding).
Runtime scene host behaviour (ScriptHost lifecycle, tick, pause).
Shared renderer-agnostic systems in packages/runtime or packages/game-components.
Input/audio/timers used by multiple scripts.
Scene transitions and asset preload for standalone builds / Preview.

Do not use this for Inspector, docking, undo commands, or project-server routes.

Before changing code

Name the layer. Runtime-safe code must not import:
- apps/editor, @game-editor/editor-core
- React
- apps/project-server
- Pixi/Three from packages/game-components shared scripts
If the feature is renderer-specific, put it in packages/renderer-pixi or packages/renderer-three. Games that do not use that renderer must not gain a static import (see docs/runtime.md).
Read only docs/runtime.md plus, if needed, docs/renderers.md / docs/scene-model.md. Follow .cursor/rules/core.mdc dependency direction.
Inspect packages/runtime/src/game-runtime.ts and packages/game-components/src/types.ts (ScriptRuntimeServices) before adding a parallel service locator.

Implementation workflow

1. Choose the package

Need	Package
Tick, load scene, register renderers, script host	`packages/runtime` (`GameRuntime`, `ScriptHost`, `load-game-project.ts`)
Service API consumed by scripts	`ScriptRuntimeServices` in `packages/game-components/src/types.ts`; implement on `GameRuntime`
Audio	`packages/runtime/src/html-audio-player.ts` (HTMLAudioElement; no Pixi)
Pointer forwarding	`GameRuntime.emitNodeClick` / `emitNodePointerEvent`; editor preview: `playback-overlay-pointer.ts`
Spawn/clone at runtime (not persisted)	`script-scene-spawn.ts`, `script-scene-clone.ts`
Scene I/O patches for scripts	`script-scene-io.ts` (transforms, Model3D playback, sprite asset)
Shared behaviour	`packages/game-components/src/shared/` via create-game-component
Game-specific behaviour	`games/<name>/src/components/` via create-game-component
Pixi/Three object mapping	`pixi-runtime-nodes.ts` / `three-runtime-nodes.ts` — never stored on `SceneData`

Read the full file on GitHub · 121 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 · 121 lines · 55 tokens per session scan A 76b96875a306

Subscribe to this mod's changes

implement-runtime-feature is a skill published in the GitHub repository andvolodko/html5-game-editor (14 stars, last pushed 1mo ago), licensed MIT. It adds 55 tokens to every session and 1,564 once invoked, about $0.0002 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

implement-runtime-feature next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
implement-runtime-featureandvolodko/html5-game-editor	Skill	14	1mo ago	MIT	A	55	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