Threejs Gameplay Systems
valkor-ai/loom
Build and iterate playable Three.js game systems: starter scaffold, architecture, design briefs, core loops, level and encounter design, entities, input, camera, collision and physics, scoring…
Turn a game idea into a focused design problem, risk-first prototype plan, and iteration loop.
Install Game Prototype Loop
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-prototype-loop --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/game-prototype-loop .claude/skills/game-prototype-loop && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "game-prototype-loop" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loop into .claude/skills/game-prototype-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-prototype-loop", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loopType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-prototype-loop --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/game-prototype-loop .agents/skills/game-prototype-loop && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "game-prototype-loop" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loop into .agents/skills/game-prototype-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-prototype-loop", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-prototype-loop --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/game-prototype-loop .cursor/skills/game-prototype-loop && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "game-prototype-loop" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loop into .cursor/skills/game-prototype-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-prototype-loop", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/hashgraph-online/awesome-codex-plugins.git --path plugins/LVTD-LLC/skills/skills/game-prototype-loop--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-prototype-loop --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/game-prototype-loop .gemini/skills/game-prototype-loop && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "game-prototype-loop" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loop into .gemini/skills/game-prototype-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-prototype-loop", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install hashgraph-online/awesome-codex-plugins game-prototype-loopInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/game-prototype-loop .github/skills/game-prototype-loop && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "game-prototype-loop" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loop into .github/skills/game-prototype-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-prototype-loop", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-prototype-loop --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/game-prototype-loop .opencode/skills/game-prototype-loop && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "game-prototype-loop" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-prototype-loop into .opencode/skills/game-prototype-loop/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-prototype-loop", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
game-prototype-loop- GitHub stars
- 1.2k
- Token cost
- ~614 tokens
- SKILL.md length
- 259 words
- Files
- 3 (incl. references)
- Skills in repo
- 736
- Repo updated
- First seen
- Licence
- MIT
At a glance
Turn a game idea into a focused design problem, risk-first prototype plan, and iteration loop.
- Works in 7 steps: State the target player experience in… → Reframe the idea as a design problem… → List the riskiest assumptions: fun,… → …
- Starting a game
- SKILL.md covers Source Traceability, Workflow, Required Output and Local References
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Game Prototype Loop is an agent skill from hashgraph-online/awesome-codex-plugins. Turn a game idea into a focused design problem, risk-first prototype plan, and iteration loop. Use when starting a game, choosing what to build first, scoping an MVP, defining design questions, planning prototypes, or deciding whether an idea is ready for production.
Its SKILL.md is about 610 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `references/core/guide.md` and `workflows/risk-first-prototype.md`). Compatibility notes: Codex, Claude Code, and other Agent Skills-compatible clients.
It sits in Game Development, covering Game design. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is MIT.
When your agent uses it
- Starting a game
- Choosing what to build first
- Defining design questions
- Planning prototypes
Example prompts
- “/game-prototype-loop”
Requirements
- Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients.
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- State the target player experience in one sentence.
- Reframe the idea as a design problem with constraints, not as a feature list.
- List the riskiest assumptions: fun, clarity, feasibility, controls, production cost, content burden, performance, market fit, and…
- Choose one prototype per major risk. Prefer paper, spreadsheet, greybox, or throwaway code before production code.
- Define the prototype's success signal before building it.
- Run the build-play-observe-decide loop until the risk is retired, reframed, or accepted.
- Convert learning into a next action: cut, keep, change, defer, or productionize.
What it can do on your machine
Read from SKILL.md and the folder at commit 16b4156. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Compatibility
Codex, Claude Code, and other Agent Skills-compatible clients.
From compatibility in the SKILL.md frontmatter.
Context cost
Game Prototype Loop loads about 614 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 72 tokens; SKILL.md has 259 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from hashgraph-online/awesome-codex-plugins at commit 16b4156, republished under its MIT licence (© hashgraph-online). 259 words, ~614 tokens.
Download SKILL.mdSave it as
.claude/skills/game-prototype-loop/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- game-prototype-loop
- description
- Turn a game idea into a focused design problem, risk-first prototype plan, and iteration loop. Use when starting a game, choosing what to build first, scoping an MVP, defining design questions, planning prototypes, or deciding whether an idea is ready for production.
- compatibility
- Codex, Claude Code, and other Agent Skills-compatible clients.
- license
- MIT
- metadata.version
- 0.1.0
- metadata.displayName
- Game Prototype Loop
- metadata.category
- Game Development
- metadata.tags
- game-design,prototyping,iteration,mvp,risk
Game Prototype Loop
Use this skill to convert vague game intent into buildable experiments. The default stance is risk-first: identify what must be true for the game to work, then build the cheapest prototype that can answer that question.
Source Traceability
Primary source: The Art of Game Design: A Book of Lenses, Third Edition by Jesse Schell, especially chapters 7-8 on idea generation, problem statements, filters, risk, prototyping, and iteration. The workflow is transformed and paraphrased from those ideas rather than copied.
Supporting source: Hunicke, LeBlanc, and Zubek's MDA framework for separating mechanics, dynamics, and aesthetics during prototype evaluation.
Workflow
- State the target player experience in one sentence.
- Reframe the idea as a design problem with constraints, not as a feature list.
- List the riskiest assumptions: fun, clarity, feasibility, controls, production cost, content burden, performance, market fit, and multiplayer or systems complexity.
- Choose one prototype per major risk. Prefer paper, spreadsheet, greybox, or throwaway code before production code.
- Define the prototype's success signal before building it.
- Run the build-play-observe-decide loop until the risk is retired, reframed, or accepted.
- Convert learning into a next action: cut, keep, change, defer, or productionize.
Required Output
When invoked, produce:
Design Problem: the player-facing experience and constraints.Assumption Map: ranked risks with why each matters.Prototype Plan: prototype type, scope, build time, success signal, and kill/change criteria.Iteration Loop: cadence, test method, evidence to collect, and next decision.Build Notes: exact implementation guidance for the coding agent.
Local References
Before producing a full plan, read:
references/core/guide.mdworkflows/risk-first-prototype.md
© hashgraph-online, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files (references) in plugins/LVTD-LLC/skills/skills/game-prototype-loop of hashgraph-online/awesome-codex-plugins.
- SKILL.md
- references/core/guide.md
- workflows/risk-first-prototype.md
Open the folder on GitHubat commit 16b4156
Compare with similar skills
Game Prototype Loop next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Game Prototype Loop this skillhashgraph-online/awesome-codex-plugins | 1.2k | — | ~614 | Automated safety check: Pass | MIT | |
| Threejs Gameplay Systemsvalkor-ai/loom | 1.2k | 1 repos | ~1.4k | Automated safety check: Pass | Apache-2.0 | |
| Godot Gdscript Patterns925236118/AlphaAgent | 103 | 9 repos | ~5k | Automated safety check: Pass | MIT | |
| Novel Game Adaptation Analysiszenstory-ai/novel-to-game | 832 | 1 repos | ~558 | Automated safety check: Pass | MIT | |
| Game Asset Spec WriterDonchitos/Claude-Code-Game-Studios | 26k | — | ~5k | Automated safety check: Pass | MIT | |
| Game Balance CheckDonchitos/Claude-Code-Game-Studios | 26k | — | ~2.2k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Game Prototype Loop
What does Game Prototype Loop do?
Turn a game idea into a focused design problem, risk-first prototype plan, and iteration loop. Game Prototype Loop is an agent skill from hashgraph-online/awesome-codex-plugins. Turn a game idea into a focused design problem, risk-first prototype plan, and iteration loop.
When should I use Game Prototype Loop?
Game Prototype Loop fits situations like: starting a game; choosing what to build first; defining design questions; planning prototypes.
How do I install Game Prototype Loop in Claude Code?
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a claude-code`. Or copy the skill folder (plugins/LVTD-LLC/skills/skills/game-prototype-loop in hashgraph-online/awesome-codex-plugins) into .claude/skills/game-prototype-loop in your project. Claude Code loads it when a task matches its description.
How do I install Game Prototype Loop in Codex?
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a codex`. Or copy the skill folder (plugins/LVTD-LLC/skills/skills/game-prototype-loop in hashgraph-online/awesome-codex-plugins) into .agents/skills/game-prototype-loop in your project. Codex loads it when a task matches its description.
Can I use Game Prototype Loop in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hashgraph-online/awesome-codex-plugins --skill game-prototype-loop -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/game-prototype-loop, .gemini/skills/game-prototype-loop, .github/skills/game-prototype-loop and .opencode/skills/game-prototype-loop in your project.
What does Game Prototype Loop need to run?
SKILL.md names no scripts, command-line tools or credentials: Game Prototype Loop is instructions for the agent only. Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients..
Does Game Prototype Loop access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Game Prototype Loop safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Game Prototype Loop use?
Game Prototype Loop is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Game Prototype Loop use?
About 614 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 714 tokens, read only when the agent opens those files.
What are the alternatives to Game Prototype Loop?
Skills that share tags, products or a category with Game Prototype Loop: Threejs Gameplay Systems (valkor-ai/loom, 1.2k stars), Godot Gdscript Patterns (925236118/AlphaAgent, 103 stars), Novel Game Adaptation Analysis (zenstory-ai/novel-to-game, 832 stars) and Game Asset Spec Writer (Donchitos/Claude-Code-Game-Studios, 26k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Game Prototype Loop?
hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,232 GitHub stars. The repository holds 736 skills in this directory. The repository was last updated on October 6, 2026.
Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.