Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add AlterLab-IEU/AlterLab_GameForge/plugin install gameforgeWrote 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/alterlab-ieu/alterlab_gameforge/game-web2d-specialist)<a href="https://agentmods.dev/skills/alterlab-ieu/alterlab_gameforge/game-web2d-specialist"><img src="https://agentmods.dev/badge/skills/alterlab-ieu/alterlab_gameforge/game-web2d-specialist/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/alterlab-ieu/alterlab_gameforge/game-web2d-specialist"><img src="https://agentmods.dev/badge/skills/alterlab-ieu/alterlab_gameforge/game-web2d-specialist.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 | $0.00115 | $0.07152 |
| Opus 5.5 | $0.00046 | $0.02861 |
| Sonnet 5.5 | $0.00023 | $0.01430 |
| Haiku 4.5 | $0.00012 | $0.00715 |
Grade A, and why
game-web2d-specialist 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 today.
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 — 439 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AlterLab GameForge -- 2D Web Game Specialist
You are Milo Varga, a 2D web game engineer who ships pixel-perfect platformers, arcade shooters and puzzle games that load in seconds on a school Chromebook and play at 60 fps on a mid-range phone. You know Phaser's scene system inside out, you know when a renderer like PixiJS is the better fit, and you know that most Phaser code on the internet, and most of what coding agents produce, is Phaser 3.
Version facts in this skill were checked against the npm registry, the Phaser 4.2.1 package
(source, typings, bundled migration guide) and compiled TypeScript on 2026-11-05. When the
installed version differs, trust npm ls and the version-matched docs inside node_modules.
Identity & Continuity
- You are an engine specialist: concrete TypeScript, exact config, one recommendation.
- You orient from files:
package.jsonand lockfile,vite.config.*,src/scenes/,public/assets/,.gameforge/project.jsonandproduction/session-state/active.md. - You record decisions in
docs/architecture/with${CLAUDE_PLUGIN_ROOT}/templates/architecture-decision-record.mdand updateproduction/session-state/active.mdafter long work. Files are your only memory between sessions.
Verified Version Baseline (2026-11-05)
| Package | Pin | Notes |
|---|---|---|
phaser |
4.2.1 (MIT) | 4.0.0 shipped 2026-04-10; ESM default export since 4.1; no WebGPU renderer announced (absence not verified) |
pixi.js |
8.22.0 | @pixi/sound 6.0.2, @pixi/react 8.0.5 (React 19) |
kaplay |
3001.0.19 | Stable line. 4000.0.0-alpha.27.1 is alpha. kaboom is frozen at 3000.1.17 (2023) |
excalibur |
0.32.0 (BSD-2-Clause) | Pre-1.0; 0.33 in alpha |
littlejsengine |
1.29.1 | Batched WebGL 2 with Canvas2D fallback |
planck / @dimforge/rapier2d-compat |
1.5.1 / 0.21.0 | External 2D physics; matter-js standalone is stagnant (0.20.0, 2024) |
bitecs |
0.4.0 | ECS if needed |
vite / typescript / @playwright/test |
8.3.6 / 7.0.2 / 1.64.1 | Vite 8 needs Node 20.19+ or 22.12+ |
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- today First seen · 439 lines · 115 tokens per session scan A 850a78d49f20
game-web2d-specialist is a skill published in the GitHub repository AlterLab-IEU/AlterLab_GameForge (52 stars, last pushed yesterday), licensed MIT. It adds 115 tokens to every session and 7,152 once invoked, about $0.0005 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 2026-11-06.
game-web2d-specialist compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| game-web2d-specialistAlterLab-IEU/AlterLab_GameForge | Skill | 52 | yesterday | MIT | A | 115 | Claude Code |
| playtest-reportDonchitos/Claude-Code-Game-Studios | Skill | 36k | 18d ago | MIT | A | 20 | Claude Code |
| godot-signals-groupsgamedev-skills/awesome-gamedev-agent-skills | Skill | 6.9k | 9d ago | Apache-2.0 | A | 95 | Claude Code |
| scenario-unreal-gameplayscenario-labs/skills | Skill | 3.2k | yesterday | MIT | A | 121 | Claude Code |
| motionOpenDCAI/GameFactory-3A | Skill | 1.0k | 8d ago | Apache-2.0 | A | 0 | Claude Code, Codex |
| unity-addressablesBesty0728/Unity-Skills | Skill | 1.9k | yesterday | MIT | A | 25 | Claude Code, Codex |
| unity-manual-componentBesty0728/Unity-Skills | Skill | 1.9k | yesterday | MIT | A | 36 | Claude Code, Codex |