project-architecture

project-architecture is a cursor rule for Cursor from Stramp/Lost-Mines-Phandelver. It costs 2,363 tokens per session, scanned A, original, MIT.

A blueprint for structuring an Unreal Engine project around data-driven rules, independent modules, and clear responsibilities between parts of the code.

In plain words
What is it for?
It guides the use of Data Tables and Data Assets, module directories, interfaces, and patterns for keeping game systems modular.
Why use it?
It helps avoid hardcoded game rules, tangled dependencies, and components that take on responsibilities belonging elsewhere.

Cursor rule for Cursor

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 rules/stramp/lost-mines-phandelver/project-architecture
Clone the repo
git clone --depth 1 https://github.com/Stramp/Lost-Mines-Phandelver

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.

agentmods badge for project-architecture

README.md
[![agentmods](https://agentmods.dev/badge/rules/stramp/lost-mines-phandelver/project-architecture.svg)](https://agentmods.dev/rules/stramp/lost-mines-phandelver/project-architecture)
Your own site
<a href="https://agentmods.dev/rules/stramp/lost-mines-phandelver/project-architecture"><img src="https://agentmods.dev/badge/rules/stramp/lost-mines-phandelver/project-architecture.svg" alt="Measured on agentmods" height="20"></a>
Per session 2,363 This file is loaded in full into every session.
When invoked 2,363 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.02363 $0.02363
Opus 5 $0.01182 $0.01182
Sonnet 5 $0.00473 $0.00473
Haiku 4.5 $0.00236 $0.00236

Measured 4d ago against content hash c5d745ccc982, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

project-architecture 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 4d 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.

.cursor/rules/project-architecture.mdc · 350 lines

How it starts

The opening of the file, as written. The whole thing — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Architecture - MyProject2

Fundamental Principles

1. Data-Driven

CRITICAL RULE: All rules come from Data Tables or Data Assets, NEVER hardcoded in code.

Implementation:

  • Use UDataTable for tabular data (races, classes, items)
  • Use UDataAsset for complex configurations (character sheets)
  • Validate data in editor with UDataAsset::PostEditChangeProperty()
  • Use FTableRowBase for data structures

Example:

// ✅ CORRECT - Data-Driven
UPROPERTY(EditDefaultsOnly, Category = "Data")
UDataTable* RaceDataTable;

// ❌ WRONG - Hardcoded
const float DwarfConstitutionBonus = 2.0f;

2. Modularity

CRITICAL RULE: Code organized by domain, each part with single and clear responsibility.

Directory Structure:

Source/MyProject2/
├── Characters/          # Characters and races
├── Components/          # Reusable components
│   ├── Data/           # Data components
│   ├── Features/        # Feature components
│   └── UI/             # UI components
├── Data/               # Data Assets and Data Tables
├── Gameplay/           # Game mechanics
└── Utils/              # Utilities

Rules:

  • Each module must be independent
  • Use interfaces for communication between modules
  • Avoid circular dependencies
  • One .h and .cpp file per class

3. Editor-Friendly

CRITICAL RULE: System must work perfectly in editor, allowing configuration without running the game.

Implementation:

  • Use WITH_EDITOR for editor-specific code
  • Validate data in PostEditChangeProperty()
  • Use UPROPERTY(EditAnywhere) for editable properties
  • Provide visual feedback in editor when possible

Example:

#if WITH_EDITOR
void UCharacterSheetDataAsset::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
    Super::PostEditChangeProperty(PropertyChangedEvent);
    ValidateData();
}
#endif

4. Multiplayer Preparation

CRITICAL RULE: System prepared for multiplayer from the start, don't refactor later.

Read the full file on GitHub · 350 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. 4d ago First seen · 350 lines · 2,363 tokens per session scan A c5d745ccc982

Subscribe to this mod's changes

project-architecture is a cursor rule published in the GitHub repository Stramp/Lost-Mines-Phandelver (2 stars, last pushed 9mo ago), licensed MIT. It adds 2,363 tokens to every session, about $0.0118 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.