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 sonereraslan/local-marketplace --skill unity-writing-gddgit clone --depth 1 https://github.com/sonereraslan/local-marketplaceWrote 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/sonereraslan/local-marketplace/unity-writing-gdd)<a href="https://agentmods.dev/skills/sonereraslan/local-marketplace/unity-writing-gdd"><img src="https://agentmods.dev/badge/skills/sonereraslan/local-marketplace/unity-writing-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.
<a href="https://agentmods.dev/skills/sonereraslan/local-marketplace/unity-writing-gdd"><img src="https://agentmods.dev/badge/skills/sonereraslan/local-marketplace/unity-writing-gdd.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 | $0.00136 | $0.02505 |
| Opus 5 | $0.00068 | $0.01252 |
| Sonnet 5 | $0.00027 | $0.00501 |
| Haiku 4.5 | $0.00014 | $0.00250 |
Grade A, and why
unity-writing-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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 336 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unity Game Planner
Professional game documentation framework — structure, audit, and consolidate GDDs to industry standard
When to Use This Skill
- Starting a new GDD from scratch
- Writing a Feature Document for a specific system
- Defining or reviewing design pillars
- Auditing an existing GDD for completeness
- Consolidating scattered design notes into one unified document
- Managing GDD versioning and terminology consistency
For design theory and constraints (pillars, mechanics framework, anti-patterns) use
unity-designer. For generating design ideas useunity-brainstorming.
Usage Patterns
"GDD init" -> Initialise a new project GDD from scratch
"GDD audit" -> Audit an existing GDD for completeness
"GDD consolidate" -> Merge scattered design docs into a single GDD
"feature doc [name]" -> Generate a Feature Document for a system
"design pillars" -> Define or review the project's design pillars
"balance template" -> Generate a numerical balance design template
GDD Core Philosophy
Industry consensus: there is no single standard format, but these principles apply universally:
| Principle | What it means |
|---|---|
| Living Document | Continuously updated — not a one-time deliverable |
| Agile & Lightweight | Avoid hundred-page documents nobody reads |
| Findable | Information must be locatable within seconds |
| Visual | Games are a visual medium — documents should use diagrams, tables, and visuals |
Two-Layer Architecture
+--------------------------------------------------------+
| Master Document |
| +-- Executive summary, vision, design pillars |
| +-- Core gameplay overview |
| +-- Links to all Feature Documents |
+--------------------------------------------------------+
|
+--------------------------------------------------------+
| Feature Documents (one per major system) |
| +-- Combat system |
| +-- Character system |
| +-- Economy system |
| +-- Movement system |
| +-- ... |
+--------------------------------------------------------+
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.
- 11d ago First seen · 336 lines · 136 tokens per session scan A f52d8910b50f
unity-writing-gdd is a skill published in the GitHub repository sonereraslan/local-marketplace (2 stars, last pushed 4mo ago), licensed MIT. It adds 136 tokens to every session and 2,505 once invoked, about $0.0007 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.
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