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…
Design, inspect, or repair game mechanics, core loops, rules, goals, actions, state, chance, secrets, skills, and emergent dynamics.
Install Game Mechanics Design
$ npx skills add hashgraph-online/awesome-codex-plugins --skill game-mechanics-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-mechanics-design --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-mechanics-design .claude/skills/game-mechanics-design && 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-mechanics-design" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-mechanics-design into .claude/skills/game-mechanics-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-mechanics-design", 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-mechanics-designType 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-mechanics-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-mechanics-design --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-mechanics-design .agents/skills/game-mechanics-design && 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-mechanics-design" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-mechanics-design into .agents/skills/game-mechanics-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-mechanics-design", 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-mechanics-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-mechanics-design --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-mechanics-design .cursor/skills/game-mechanics-design && 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-mechanics-design" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-mechanics-design into .cursor/skills/game-mechanics-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-mechanics-design", 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-mechanics-design--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-mechanics-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins game-mechanics-design --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-mechanics-design .gemini/skills/game-mechanics-design && 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-mechanics-design" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-mechanics-design into .gemini/skills/game-mechanics-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-mechanics-design", 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-mechanics-designInstalls 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-mechanics-design -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-mechanics-design .github/skills/game-mechanics-design && 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-mechanics-design" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-mechanics-design into .github/skills/game-mechanics-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-mechanics-design", 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-mechanics-design -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-mechanics-design --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-mechanics-design .opencode/skills/game-mechanics-design && 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-mechanics-design" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/LVTD-LLC/skills/skills/game-mechanics-design into .opencode/skills/game-mechanics-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "game-mechanics-design", 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-mechanics-design- GitHub stars
- 1.3k
- Token cost
- ~569 tokens
- SKILL.md length
- 220 words
- Files
- 3 (incl. references)
- Skills in repo
- 716
- Repo updated
- First seen
- Licence
- MIT
At a glance
Design, inspect, or repair game mechanics, core loops, rules, goals, actions, state, chance, secrets, skills, and emergent dynamics.
- Works in 5 steps: Identify the core loop: player input,… → Specify mechanics across space, time,… → Predict dynamics: dominant strategies,… → …
- Building gameplay systems
- 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 Mechanics Design is an agent skill from hashgraph-online/awesome-codex-plugins. Design, inspect, or repair game mechanics, core loops, rules, goals, actions, state, chance, secrets, skills, and emergent dynamics. Use when building gameplay systems, combat, puzzles, progression, simulations, board/card mechanics, or any feature where rules create player behavior.
Its SKILL.md is about 570 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/mechanic-spec.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
- Building gameplay systems
- Board/card mechanics
- Any feature where rules create player behavior
Example prompts
- “/game-mechanics-design”
Requirements
- Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients.
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Identify the core loop: player input, system response, feedback, reward or consequence, and next decision.
- Specify mechanics across space, time, objects, attributes, state, actions, rules, goals, skill, chance, and information visibility.
- Predict dynamics: dominant strategies, degenerate loops, emergent interactions, pacing, and failure states.
- Define player mastery: what starts simple, what becomes expressive, and how players improve.
- Produce implementation-ready rules with test cases and tuning parameters.
What it can do on your machine
Read from SKILL.md and the folder at commit 3e1456a. 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 Mechanics Design loads about 569 tokens when it runs, and up to ~1.2k if it reads all its reference files. Until then it costs about 77 tokens; SKILL.md has 220 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 3e1456a, republished under its MIT licence (© hashgraph-online). 220 words, ~569 tokens.
Download SKILL.mdSave it as
.claude/skills/game-mechanics-design/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- game-mechanics-design
- description
- Design, inspect, or repair game mechanics, core loops, rules, goals, actions, state, chance, secrets, skills, and emergent dynamics. Use when building gameplay systems, combat, puzzles, progression, simulations, board/card mechanics, or any feature where rules create player behavior.
- compatibility
- Codex, Claude Code, and other Agent Skills-compatible clients.
- license
- MIT
- metadata.version
- 0.1.0
- metadata.displayName
- Game Mechanics Design
- metadata.category
- Game Development
- metadata.tags
- game-design,mechanics,systems,core-loop,emergence
Game Mechanics Design
Use this skill to make gameplay systems explicit enough for an AI coding agent to implement, test, and tune. The mechanic spec should separate rule structure from presentation so the same idea can be prototyped cheaply before polish.
Source Traceability
Primary source: The Art of Game Design: A Book of Lenses, Third Edition by Jesse Schell, especially chapters 12-14 on mechanics, balance, and puzzles. The workflow is transformed and paraphrased.
Supporting source: MDA, which helps distinguish coded mechanics from the player-visible dynamics and aesthetic experience they produce.
Workflow
- Identify the core loop: player input, system response, feedback, reward or consequence, and next decision.
- Specify mechanics across space, time, objects, attributes, state, actions, rules, goals, skill, chance, and information visibility.
- Predict dynamics: dominant strategies, degenerate loops, emergent interactions, pacing, and failure states.
- Define player mastery: what starts simple, what becomes expressive, and how players improve.
- Produce implementation-ready rules with test cases and tuning parameters.
Required Output
Mechanic Brief: player promise, core loop, and intended dynamics.Rules Model: state, objects, actions, rules, goals, and information.Implementation Notes: data structures, tunable constants, edge cases, and instrumentation.Failure Modes: exploits, dead ends, unreadable outcomes, and boring optimal play.Test Scenarios: deterministic cases the agent can implement.
Local References
Before producing a mechanic spec, read:
references/core/guide.mdworkflows/mechanic-spec.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-mechanics-design of hashgraph-online/awesome-codex-plugins.
- SKILL.md
- references/core/guide.md
- workflows/mechanic-spec.md
Open the folder on GitHubat commit 3e1456a
Compare with similar skills
Game Mechanics Design 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 Mechanics Design this skillhashgraph-online/awesome-codex-plugins | 1.3k | — | ~569 | 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 | 10 repos | ~5k | Automated safety check: Pass | MIT | |
| Game Asset Spec WriterDonchitos/Claude-Code-Game-Studios | 26k | — | ~5k | Automated safety check: Pass | MIT | |
| Game Build From Designzenstory-ai/novel-to-game | 841 | — | ~661 | Automated safety check: Pass | MIT | |
| Game Experience Density OptimizerDY-2026/GameDesignOS | 415 | — | ~2.1k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Game Mechanics Design
What does Game Mechanics Design do?
Design, inspect, or repair game mechanics, core loops, rules, goals, actions, state, chance, secrets, skills, and emergent dynamics. Game Mechanics Design is an agent skill from hashgraph-online/awesome-codex-plugins. Design, inspect, or repair game mechanics, core loops, rules, goals, actions, state, chance, secrets, skills, and emergent dynamics.
When should I use Game Mechanics Design?
Game Mechanics Design fits situations like: building gameplay systems; board/card mechanics; any feature where rules create player behavior.
How do I install Game Mechanics Design in Claude Code?
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill game-mechanics-design -a claude-code`. Or copy the skill folder (plugins/LVTD-LLC/skills/skills/game-mechanics-design in hashgraph-online/awesome-codex-plugins) into .claude/skills/game-mechanics-design in your project. Claude Code loads it when a task matches its description.
How do I install Game Mechanics Design in Codex?
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill game-mechanics-design -a codex`. Or copy the skill folder (plugins/LVTD-LLC/skills/skills/game-mechanics-design in hashgraph-online/awesome-codex-plugins) into .agents/skills/game-mechanics-design in your project. Codex loads it when a task matches its description.
Can I use Game Mechanics Design 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-mechanics-design -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-mechanics-design, .gemini/skills/game-mechanics-design, .github/skills/game-mechanics-design and .opencode/skills/game-mechanics-design in your project.
What does Game Mechanics Design need to run?
SKILL.md names no scripts, command-line tools or credentials: Game Mechanics Design is instructions for the agent only. Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients..
Does Game Mechanics Design 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 Mechanics Design 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 Mechanics Design use?
Game Mechanics Design 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 Mechanics Design use?
About 569 tokens (SKILL.md is roughly 2.3k 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 651 tokens, read only when the agent opens those files.
What are the alternatives to Game Mechanics Design?
Skills that share tags, products or a category with Game Mechanics Design: Threejs Gameplay Systems (valkor-ai/loom, 1.2k stars), Godot Gdscript Patterns (925236118/AlphaAgent, 103 stars), Game Asset Spec Writer (Donchitos/Claude-Code-Game-Studios, 26k stars) and Game Build From Design (zenstory-ai/novel-to-game, 841 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Game Mechanics Design?
hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,267 GitHub stars. The repository holds 716 skills in this directory. The repository was last updated on October 10, 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.