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game-design-fundamentals

game-design-fundamentals is a skill for Claude Code, Codex from mtarcure/claude-vibe-squad. It costs 70 tokens per session (300 once invoked), scanned A, original, MIT.

An initial design brief for deciding what a game is about before detailed production begins. It defines the player fantasy, main experience goals, gameplay loops, actions, objectives, obstacles, resources, and ways to win, lose, and progress.

In plain words
What is it for?
Use it to shape a new playable concept and document its moment-to-moment, session, and long-term progression structure.
Why use it?
It gives later specialists a shared description of the intended play instead of asking them to invent the core concept while building it. It focuses on the game direction, not numerical balancing or final production details.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

not rated 228repo +9 9d ago A scan SkillSpector: pass 70 tokens original MIT

Good fit Use it to shape a new playable concept and document its moment-to-moment, session, and long-term progression structure.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mtarcure/claude-vibe-squad/game-design-fundamentals
View source ↗ mtarcure/claude-vibe-squad
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 mtarcure/claude-vibe-squad --skill game-design-fundamentals
Clone the repo
git clone --depth 1 https://github.com/mtarcure/claude-vibe-squad

Made for: Claude Code, Codex.

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.

agentmods badge for game-design-fundamentals

README.md
[![agentmods](https://agentmods.dev/badge/skills/mtarcure/claude-vibe-squad/game-design-fundamentals/github.svg)](https://agentmods.dev/skills/mtarcure/claude-vibe-squad/game-design-fundamentals)
Your own site
<a href="https://agentmods.dev/skills/mtarcure/claude-vibe-squad/game-design-fundamentals"><img src="https://agentmods.dev/badge/skills/mtarcure/claude-vibe-squad/game-design-fundamentals/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.

agentmods 80×15 button for game-design-fundamentals

Your own site · 80×15
<a href="https://agentmods.dev/skills/mtarcure/claude-vibe-squad/game-design-fundamentals"><img src="https://agentmods.dev/badge/skills/mtarcure/claude-vibe-squad/game-design-fundamentals.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 300 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00070 $0.00300
Opus 5.5 $0.00028 $0.00120
Sonnet 5.5 $0.00014 $0.00060
Haiku 4.5 $0.00007 $0.00030

Measured 2mo ago against content hash de3a201b8c6e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

game-design-fundamentals 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.

.agents/skills/game-design-fundamentals/SKILL.md · 22 lines

What it actually says

Game Design Fundamentals

Turn a game concept into a design contract: core loop, player fantasy, goals/obstacles, and the experience pillars everything else serves.

Steps

  1. State the player fantasy and the experience pillars (3–5) the game must deliver.
  2. Define the core loop (the moment-to-moment action → reward → motivation cycle) and the session/meta loops around it.
  3. Specify goals, obstacles, and the resources/verbs the player uses to act on the world.
  4. Define the win/lose/progress conditions and how difficulty and mastery evolve over time.
  5. Write the result as a contract downstream specialists consume (level-design-patterns, narrative-structure, game-mechanics-balancing); flag anything requiring engine support to game-engineer.

Acceptance

  • The core loop is explicit and tied to the stated player fantasy/pillars.
  • Goals, obstacles, and player verbs are named, not implied.
  • The output is a contract the level/narrative/balance specialists can build against.
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.

  1. 2mo ago First seen · 22 lines · 70 tokens per session scan A de3a201b8c6e

Subscribe to this mod's changes

game-design-fundamentals is a skill published in the GitHub repository mtarcure/claude-vibe-squad (228 stars, last pushed 9d ago), licensed MIT. It adds 70 tokens to every session and 300 once invoked, about $0.0003 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 2026-08-30.

Claude CodeGame developmentagent-orchestrationai-agentsclimcpmodel-context-protocol
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