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.
npx skills add ityes22/game-design-document --skill game-design-documentgit clone --depth 1 https://github.com/ityes22/game-design-documentWrote 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.
[](https://agentmods.dev/skills/ityes22/game-design-document/game-design-document)<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/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.
<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="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00100 | $0.06592 |
| Opus 5.5 | $0.00040 | $0.02637 |
| Sonnet 5.5 | $0.00020 | $0.01318 |
| Haiku 4.5 | $0.00010 | $0.00659 |
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 1mo 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. 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.
What ships with it
21 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.
- assets/cover_page_spec.md 11 KB
- examples/example_mobile_rpg_gdd_outline.md 17 KB
- examples/example_multiplayer_shooter_outline.md 20 KB
- examples/example_roguelike_gdd_outline.md 17 KB
- scripts/generate_gdd_docx.py 24 KB runs code
- scripts/generate_gdd_pdf.py 16 KB runs code
- scripts/generate_one_pager_pdf.py 19 KB runs code
- scripts/generate_pitch_deck_pptx.py 22 KB runs code
- scripts/utils/__init__.py 0 B runs code
- scripts/utils/docx_styles.py 20 KB runs code
- scripts/utils/pdf_builder.py 19 KB runs code
- scripts/utils/pptx_builder.py 16 KB runs code
- scripts/utils/section_registry.py 23 KB runs code
- templates/art_direction_template.md 13 KB
- templates/competitive_analysis_template.md 9.6 KB
- templates/gdd_master_structure.md 20 KB
- templates/mechanics_specification_template.md 12 KB
- templates/monetization_strategy_template.md 12 KB
- templates/one_page_pitch_template.md 15 KB
- templates/technical_requirements_template.md 11 KB
- templates/ux_flow_template.md 13 KB
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.
- 1mo ago First seen · 431 lines · 100 tokens per session scan C 9c6c6ee3d2ee
game-design-document is a skill published in the GitHub repository ityes22/game-design-document (7 stars, last pushed 7mo ago), with no licence file. It adds 100 tokens to every session and 6,592 once invoked, about $0.0004 per session on Opus 5.5. 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.
Other skills, from other repositories
game-design-one-page-design-doc
Create a concise one-page game design document and export it as both markdown and PDF. Use when a user wants a one-page design doc, one-pager, pitchable design summary, or compact game concept sheet that captures identity, pillars, summary, features, interface, aesthetic direction, sound, audience, platform, and…
apify-youtube-transcript-scraper
Get YouTube captions, timestamped quotations, SRT/VTT and translated transcripts for videos, channels and playlists through the harshmaur/youtube-transcript-scraper Apify Actor.
foundry-hosted-agent-validation
Step-by-step process for validating a Python Foundry hosted agent sample (under python/samples/04-hosting/foundry-hosted-agents/) end to end — running it locally (native runtime and azd ai agent run) and after deploying it to an Azure AI Foundry project with azd. Use this when asked to validate a hosted agent sample.
skill-doc-delivery
Convert markdown to DOCX, PPTX, XLSX, PDF office documents — use when you need exportable deliverables.
meta-web-to-pdf-briefing
Render a topic into a distributable PDF briefing in three steps: web search → bullet summary → styled PDF. Trigger when the user asks for a PDF briefing on a single topic.
pkf-writing
Author, update, convert, validate, persist, and render PKF (.pkf) content through message-inline, Library Asset, or Memory Page carriers. Use for structured reports, knowledge pages, delivery cards, or any .pkf body. NOT for recall, memory-graph placement, or curation decisions — those belong to the memory skill.