game-design-document

game-design-document is a skill for Claude Code, Codex from ityes22/game-design-document. It costs 100 tokens per session (6,592 once invoked), scanned C, original, no licence file.

A tool that turns a game idea into a Game Design Document (GDD), a structured plan for how a game works and is presented. It produces the document as Word and PDF files.

In plain words
What is it for?
Documenting gameplay loops, mechanics, user-interface flows, art direction, monetization, technical requirements, and competitive analysis.
Why use it?
It helps organize a game concept into one detailed document covering the design, player experience, business plan, technical needs, and competing games.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/ityes22/game-design-document/game-design-document
Any agent
npx skills add ityes22/game-design-document --skill game-design-document
Clone the repo
git clone --depth 1 https://github.com/ityes22/game-design-document

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-document

README.md
[![agentmods](https://agentmods.dev/badge/skills/ityes22/game-design-document/game-design-document.svg)](https://agentmods.dev/skills/ityes22/game-design-document/game-design-document)
Your own site
<a href="https://agentmods.dev/skills/ityes22/game-design-document/game-design-document"><img src="https://agentmods.dev/badge/skills/ityes22/game-design-document/game-design-document.svg" alt="Measured on agentmods" height="20"></a>
Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,592 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown 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 $0.00100 $0.06592
Opus 5 $0.00050 $0.03296
Sonnet 5 $0.00020 $0.01318
Haiku 4.5 $0.00010 $0.00659

Measured 5d ago against content hash 9c6c6ee3d2ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

game-design-document scanned grade C with 1 finding 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 5d 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.

Tells the agent never to refusehighAnti-refusal

Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.

**User has a one-line idea:** "I have an idea for a survival game." → Run Phase 1, Batch 1 only. Do not refuse. Guide them through the concept via questions. A vague idea becomes a GDD through the interview.
SKILL.md · 431 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 5d ago First seen · 431 lines · 100 tokens per session scan C 9c6c6ee3d2ee

Subscribe to this mod's changes

game-design-document is a skill published in the GitHub repository ityes22/game-design-document (6 stars, last pushed 6mo ago), with no licence file. It adds 100 tokens to every session and 6,592 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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