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ev2090: Cursor rule for Cursor

.cursorrules

cursorrules is a cursor rule for Cursor from Anashel-RPG/ev2090. It costs 1,052 tokens per session, scanned A, original, MIT.

Project rules for a React and Three.js game application with a Cloudflare backend. They define a strict boundary: the game engine handles 3D code, while React handles the interface and communicates through a specified bridge.

In plain words
What is it for?
Use them when changing the engine, React components, Cloudflare Worker services, the admin dashboard, or the bridge that sends game state to the interface.
Why use it?
They prevent incompatible imports and architectural coupling, such as putting React code in the engine or Three.js code in interface components. This keeps rendering and interface state connected through the intended channel.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/. Also seen: mentions Cursor.

This is Anashel-RPG/ev2090's own configuration. It tells Cursor how to work on ev2090 itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ev2090 configures →

not rated 10repo 8mo ago A scan 1,052 tokens original MIT
View source ↗ Anashel-RPG/ev2090
Reuse

Borrowing it

Nothing to install: this file belongs to Anashel-RPG/ev2090. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Anashel-RPG/ev2090/main/.cursorrules
Clone the repo
git clone --depth 1 https://github.com/Anashel-RPG/ev2090

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 cursorrules

README.md
[![agentmods](https://agentmods.dev/badge/rules/anashel-rpg/ev2090/cursorrules/github.svg)](https://agentmods.dev/rules/anashel-rpg/ev2090/cursorrules)
Your own site
<a href="https://agentmods.dev/rules/anashel-rpg/ev2090/cursorrules"><img src="https://agentmods.dev/badge/rules/anashel-rpg/ev2090/cursorrules/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 cursorrules

Your own site · 80×15
<a href="https://agentmods.dev/rules/anashel-rpg/ev2090/cursorrules"><img src="https://agentmods.dev/badge/rules/anashel-rpg/ev2090/cursorrules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,052 This file is loaded in full into every session.
When invoked 1,052 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01052 $0.01052
Opus 5.5 $0.00421 $0.00421
Sonnet 5.5 $0.00210 $0.00210
Haiku 4.5 $0.00105 $0.00105

Measured 2mo ago against content hash 95f0f10bc062, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cursorrules 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 2mo 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.

.cursorrules · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

EV · 2090 — Cursor Rules

https://ev2090.com | React 19 + Three.js + Cloudflare Workers

The One Rule (Architecture Boundary)

NEVER import React in any file under engine/. NEVER import Three.js in any file under components/. The engine is pure Three.js. React and the engine communicate only through GameCanvasHandle (imperative ref in GameCanvas.tsx). The engine pushes GameState to React at ~20fps via a subscribe callback. When a component needs 3D rendering, create a standalone class in engine/ and instantiate it from the component via useEffect — see ShipPreview.ts and ShipDetailRenderer.ts for the pattern.

Tech Stack

  • React 19 + Three.js 0.172 + TypeScript 5.7 + Vite 6 (frontend)
  • Cloudflare Workers + Durable Objects + R2 + Queues (backend, worker/)
  • MCP server with 37 tools and OAuth 2.0 (worker-mcp/)
  • Admin dashboard (admin/) — local dev only, never deploy
  • Path alias: @/ → frontend/src/

Key Files

  • frontend/src/engine/Engine.ts — core game loop, scene, all subsystem orchestration
  • frontend/src/components/GameCanvas.tsx — React-to-Engine bridge (forwardRef + useImperativeHandle)
  • frontend/src/components/Game.tsx — top-level React orchestrator
  • frontend/src/types/game.ts — shared types: GameState, ShipState, RadarContact
  • frontend/src/engine/ShipCatalog.ts — ship definitions (11 built-in + community)
  • worker/src/index.ts — HTTP router + queue consumer
  • worker/src/economy-region.ts — NPC economy engine (SQLite, 60s tick alarm)
  • worker-mcp/src/index.ts — MCP server entry point

Patterns to Follow

Engine systems (engine/systems/)

Always: constructor(scene, ...) + update(dt) + dispose() Wire into Engine.ts: instantiate in constructor, call update(dt) in loop, call dispose() in Engine.dispose().

Engine entities (engine/entities/)

Always: constructor(config) + update(dt) + dispose() Entity owns a THREE.Group as root mesh. scene.add(entity.mesh) in Engine, entity.dispose() on teardown. All Three.js objects (geometry, materials, textures) MUST be disposed to prevent GPU memory leaks.

Read the full file on GitHub · 71 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. 2mo ago First seen · 71 lines · 1,052 tokens per session scan A 95f0f10bc062

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository Anashel-RPG/ev2090 (10 stars, last pushed 8mo ago), licensed MIT. It adds 1,052 tokens to every session, about $0.0042 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 2026-08-31.

FrontendGame development
Related

cursorrules compared with cursor rules from other repositories

cursorrules next to 6 cursor rules from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
cursorrulesAnashel-RPG/ev2090Cursor rule108mo agoMITA1,052Cursor
meta-quest-agentic-toolsoculus-samples/Unity-MovementCursor rule3911mo agononeA152Cursor
narrative-writingholycube/game-narrative-mcpCursor rule04mo agoMITA273Cursor
meta-quest-agentic-toolsoculus-samples/Unity-MetaXRInteractionSDK-AvatarSampleCursor rule245mo agononeA152Cursor
visual-and-observational-rulespaulpham157/paul-s-cursor-rulesCursor rule271y agoMITA0Cursor
00-project-overviewMrG4dget/5e-tools-mcpCursor rule21y agoMITA205Cursor
ponytailDietrichGebert/ponytailCursor rule185k8d agoMITA604Cursor