What is game-development?

A game-development guide that routes work to more specific advice based on platform, dimensions, and specialty. It covers web, mobile, PC, and VR/AR games, plus design, networking, art, and audio.

Use it to decide which game-development skill fits a project, such as web games, mobile games, 2D or 3D work, multiplayer systems, game design, art, or sound.

It helps select the right area of game-development guidance instead of applying the same process to every type of game project.

game-development — Skill for Claude Code by bcastelino

Install

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.

Any agent

npx skills add bcastelino/agent-skills-kit --skill game-development

Clone the repo

git clone --depth 1 https://github.com/bcastelino/agent-skills-kit

Made for: Claude Code.

Or install game-development, the plugin that ships this one along with the rest of its 11 skills.

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/bcastelino/agent-skills-kit/game-development/github.svg)](https://agentmods.dev/skills/bcastelino/agent-skills-kit/game-development)

Your own site

<a href="https://agentmods.dev/skills/bcastelino/agent-skills-kit/game-development"><img src="https://agentmods.dev/badge/skills/bcastelino/agent-skills-kit/game-development/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/bcastelino/agent-skills-kit/game-development"><img src="https://agentmods.dev/badge/skills/bcastelino/agent-skills-kit/game-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,145 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 91% copy Near-identical to another mod 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	$0.00027	$0.01145
Opus 5.5	$0.00011	$0.00458
Sonnet 5.5	$0.00005	$0.00229
Haiku 4.5	$0.00003	$0.00114

Measured 2mo ago against content hash 45bd375db359, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

game-development 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.

Origin

This is a copy

91% identical to game-development — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/game-development/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Game Development

Orchestrator skill that provides core principles and routes to specialized sub-skills.

When to Use This Skill

You are working on a game development project. This skill teaches the PRINCIPLES of game development and directs you to the right sub-skill based on context.

Sub-Skill Routing

Platform Selection

If the game targets...	Use Sub-Skill
Web browsers (HTML5, WebGL)	`game-development/web-games`
Mobile (iOS, Android)	`game-development/mobile-games`
PC (Steam, Desktop)	`game-development/pc-games`
VR/AR headsets	`game-development/vr-ar`

Dimension Selection

If the game is...	Use Sub-Skill
2D (sprites, tilemaps)	`game-development/2d-games`
3D (meshes, shaders)	`game-development/3d-games`

Specialty Areas

If you need...	Use Sub-Skill
GDD, balancing, player psychology	`game-development/game-design`
Multiplayer, networking	`game-development/multiplayer`
Visual style, asset pipeline, animation	`game-development/game-art`
Sound design, music, adaptive audio	`game-development/game-audio`

Core Principles (All Platforms)

1. The Game Loop

Every game, regardless of platform, follows this pattern:

INPUT  → Read player actions
UPDATE → Process game logic (fixed timestep)
RENDER → Draw the frame (interpolated)

Fixed Timestep Rule:

Physics/logic: Fixed rate (e.g., 50Hz)
Rendering: As fast as possible
Interpolate between states for smooth visuals

2. Pattern Selection Matrix

Pattern	Use When	Example
State Machine	3-5 discrete states	Player: Idle→Walk→Jump
Object Pooling	Frequent spawn/destroy	Bullets, particles
Observer/Events	Cross-system communication	Health→UI updates
ECS	Thousands of similar entities	RTS units, particles
Command	Undo, replay, networking	Input recording
Behavior Tree	Complex AI decisions	Enemy AI

Read the full file on GitHub · 167 lines

Files

What ships with it

10 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.

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 · 167 lines · 27 tokens per session scan A 45bd375db359

Subscribe to this mod's changes

game-development is a skill published in the GitHub repository bcastelino/agent-skills-kit (2 stars, last pushed 3mo ago), licensed MIT. It adds 27 tokens to every session and 1,145 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to game-development, differing in 5 lines, and is treated as a copy.

Claude Code Game development agent-skill-repository agent-skills ai-agents antigravity claude-code-plugin

game-development next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
game-developmentbcastelino/agent-skills-kit	Skill	2	3mo ago	MIT	A	27	Claude Code
researcherkeli-wen/agy-staff	Skill	869	2d ago	MIT	A	75	Claude Code
reviewerkeli-wen/agy-staff	Skill	869	2d ago	MIT	B	94	Claude Code
cloudflare-durable-objectssecondsky/claude-skills	Skill	248	14d ago	MIT	A	43	Claude Code
dead-code-huntermagic5644/Graph-It-Live	Skill	63	yesterday	MIT	A	165	Claude Code
onboarding-expressmagic5644/Graph-It-Live	Skill	63	yesterday	MIT	A	171	Claude Code
debugging-workflowsCrowdStrike/foundry-skills	Skill	39	yesterday	MIT	A	90	Claude Code