A project-wide description of a Unity 6.2 LTS game using C# 12, URP, the new Input System, UI Toolkit, Addressables, multiplayer networking, and Unity’s testing tools.

Use it as the baseline when adding Unity features, choosing APIs, organizing systems, handling assets, building multiplayer code, or writing tests. It also sets expectations for modularity, performance, naming, documentation, and supported platforms.

It gives coding agents the project’s required technology choices and architectural expectations, reducing the chance that new code uses incompatible or outdated systems.

index — Cursor rule for Cursor by Common-ka/ai-agent-unity-rules

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.

Clone the repo

git clone --depth 1 https://github.com/Common-ka/ai-agent-unity-rules

Made for: Cursor.

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/common-ka/ai-agent-unity-rules/index/github.svg)](https://agentmods.dev/rules/common-ka/ai-agent-unity-rules/index)

Your own site

<a href="https://agentmods.dev/rules/common-ka/ai-agent-unity-rules/index"><img src="https://agentmods.dev/badge/rules/common-ka/ai-agent-unity-rules/index/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/common-ka/ai-agent-unity-rules/index"><img src="https://agentmods.dev/badge/rules/common-ka/ai-agent-unity-rules/index.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 392 This file is loaded in full into every session.

When invoked 392 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00392	$0.00392
Opus 5.5	$0.00157	$0.00157
Sonnet 5.5	$0.00078	$0.00078
Haiku 4.5	$0.00039	$0.00039

Measured 1mo ago against content hash 5d997d3e22dd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

index 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 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.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

index — 100% identical, 0 lines differ

.cursor/index.mdc · 70 lines

What it actually says

Unity 6.2 Project Rules

Project Overview

This project uses Unity 6.2 (LTS 2025) with modern systems and architectural approaches.

Tech Stack

Unity Version: 6.2 LTS (2025)
C# Version: 12.0
Rendering Pipeline: URP (Universal Render Pipeline)
Input System: New Input System (InputSystem package)
UI Framework: UI Toolkit (not UGUI)
Asset Management: Addressables
Multiplayer: Netcode for GameObjects
Testing: Unity Test Framework

Architectural Principles

1. Modularity

Each system must be independent
Use ScriptableObject Architecture for configuration
Use dependency injection to wire up components

2. Performance

Object pooling for frequently instantiated objects
Addressables instead of Resources
ECS/DOTS for performance-critical systems
Burst Compiler where applicable

3. Maintainability

Strict naming conventions
XML documentation for public APIs
Unit tests for business logic
Prefabs for reusable objects

4. Code Style

Follow the Unity C# Style Guide
Use modern C# features (pattern matching, records, init-only properties)
async/await instead of coroutines where possible

Supported Platforms

Windows (Primary)
macOS
Linux
iOS
Android
WebGL (limited support)

Important Rules

✅ ALWAYS:

New Input System
UI Toolkit
Addressables
[SerializeField] instead of public
XML documentation

❌ NEVER:

Legacy Input
UGUI for new UI
Resources.Load
FindObjectOfType in Update
Magic numbers

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.

1mo ago First seen · 70 lines · 392 tokens per session scan A 5d997d3e22dd

Subscribe to this mod's changes

index is a cursor rule published in the GitHub repository Common-ka/ai-agent-unity-rules (41 stars, last pushed 10mo ago), licensed MIT. It adds 392 tokens to every session, about $0.0016 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.

Game development ai-coding best-practices cursor-ide cursor-rules

index