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gdd

gdd is a skill for Claude Code from CodePhobiia/claude-roblox-game-studio. It costs 52 tokens per session (614 once invoked), scanned A, original, MIT.

A Game Design Document workflow for recording how a Roblox game or one of its systems should work.

In plain words
What is it for?
Use it to create or update a master game plan or a plan for a specific system, including mechanics, saved-data structure, multiplayer features, monetisation, and technical constraints.
Why use it?
It gives the team a shared written plan for gameplay, player progress, technical structure, content, and business decisions.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

not rated 9repo 4mo ago A scan 52 tokens original MIT

Good fit Use it to create or update a master game plan or a plan for a specific system, including mechanics, saved-data structure, multiplayer features, monetisation, and technical constraints.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/codephobiia/claude-roblox-game-studio/gdd
View source ↗ CodePhobiia/claude-roblox-game-studio
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 CodePhobiia/claude-roblox-game-studio --skill gdd
Clone the repo
git clone --depth 1 https://github.com/CodePhobiia/claude-roblox-game-studio

Made for: Claude Code.

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 gdd

README.md
[![agentmods](https://agentmods.dev/badge/skills/codephobiia/claude-roblox-game-studio/gdd/github.svg)](https://agentmods.dev/skills/codephobiia/claude-roblox-game-studio/gdd)
Your own site
<a href="https://agentmods.dev/skills/codephobiia/claude-roblox-game-studio/gdd"><img src="https://agentmods.dev/badge/skills/codephobiia/claude-roblox-game-studio/gdd/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 gdd

Your own site · 80×15
<a href="https://agentmods.dev/skills/codephobiia/claude-roblox-game-studio/gdd"><img src="https://agentmods.dev/badge/skills/codephobiia/claude-roblox-game-studio/gdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 614 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.
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 $0.00052 $0.00614
Opus 5 $0.00026 $0.00307
Sonnet 5 $0.00010 $0.00123
Haiku 4.5 $0.00005 $0.00061

Measured 9d ago against content hash ef6f8b58f35c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

gdd 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 9d 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.

.claude/skills/gdd/SKILL.md · 49 lines

How it starts

The opening of the file, as written. The whole thing — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/gdd — Game Design Document Workflow

If no argument provided (Master GDD):

Create the master GDD at design/gdd/master-gdd.md using the template at .claude/docs/templates/gdd-master.md.

The master GDD must include:

  1. Game Overview: Concept, genre, platform (Roblox), target audience
  2. Creative Pillars: 3-5 pillars that guide all decisions
  3. Core Loop: 30-second, 5-minute, session, and meta loops
  4. Systems Overview: List all game systems with 1-sentence descriptions
  5. Player Progression: How do players grow over time?
  6. Monetization Strategy: GamePasses, DevProducts, Premium Benefits
  7. Social Features: Multiplayer, trading, guilds, parties
  8. Target Metrics: D1/D7/D30 retention targets, session length goals
  9. Content Plan: Launch content vs. future updates
  10. Technical Overview: Client-server split, DataStore approach, key technical constraints

If argument provided (System GDD):

Create a system-specific GDD at design/gdd/<system-name>-gdd.md using the template at .claude/docs/templates/gdd-system.md.

Every system GDD must include:

  1. Overview & Purpose
  2. Core Mechanics (detailed)
  3. Data Schema (DataStore keys, types, defaults)
  4. Client-Server Split (what runs where)
  5. RemoteEvents/Functions needed (with argument contracts)
  6. Player-Facing UI (mockup or description)
  7. Edge Cases & Error States
  8. Balancing Parameters (formulas, not magic numbers)
  9. Integration Points (dependencies on other systems)

Workflow Steps

  1. Ask Context: "Are you creating a new GDD or updating an existing one?"
  2. Delegate: Route to game-designer agent for master GDD, or systems-designer for system GDD
  3. Draft: Show the draft to the user for review (never save directly)
  4. Iterate: Apply feedback, present updated draft
  5. Approve: User confirms; save to design/gdd/
  6. Update Index: If a new system, update design/gdd/systems-index.md

After creating any GDD:

  • Run /design-review to validate quality
  • Update design/gdd/systems-index.md if a new system was added
  • Link related GDDs (combat GDD references weapons GDD, etc.)

Read the full file on GitHub · 49 lines

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. 9d ago First seen · 49 lines · 52 tokens per session scan A ef6f8b58f35c

Subscribe to this mod's changes

gdd is a skill published in the GitHub repository CodePhobiia/claude-roblox-game-studio (9 stars, last pushed 4mo ago), licensed MIT. It adds 52 tokens to every session and 614 once invoked, about $0.0003 per session on Opus 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 2026-08-31.

Game development
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