project-structure

project-structure is a cursor rule for Cursor from AxiosLeo/node-koapp. It costs 307 tokens per session, scanned A, original, MIT.

An overview of the structure and main parts of Koapp, a Node.js web framework built on Koa.js. It describes its HTTP, TCP socket, and WebSocket application types, along with routers, controllers, models, middleware, tests, and templates.

In plain words
What is it for?
Use it when navigating the project, choosing between HTTP, TCP socket, and WebSocket servers, locating framework components, or understanding how the CLI and project templates are organized.
Why use it?
It helps new contributors find the right part of the framework and understand how its application types relate. It also explains where source code, commands, templates, and tests are kept.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc). Also seen: installed under .agents/ (shared by several agents).

Good fit Use it when navigating the project, choosing between HTTP, TCP socket, and WebSocket servers, locating framework components, or understanding how the CLI and project templates are organized.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/axiosleo/node-koapp/project-structure
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/AxiosLeo/node-koapp

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-structure

README.md
[![agentmods](https://agentmods.dev/badge/rules/axiosleo/node-koapp/project-structure/github.svg)](https://agentmods.dev/rules/axiosleo/node-koapp/project-structure)
Your own site
<a href="https://agentmods.dev/rules/axiosleo/node-koapp/project-structure"><img src="https://agentmods.dev/badge/rules/axiosleo/node-koapp/project-structure/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 project-structure

Your own site · 80×15
<a href="https://agentmods.dev/rules/axiosleo/node-koapp/project-structure"><img src="https://agentmods.dev/badge/rules/axiosleo/node-koapp/project-structure.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 307 This file is loaded in full into every session.
When invoked 307 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 $0.00307 $0.00307
Opus 5.5 $0.00123 $0.00123
Sonnet 5.5 $0.00061 $0.00061
Haiku 4.5 $0.00031 $0.00031

Measured 1mo ago against content hash 070fd07e74e6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

project-structure 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.

.agents/rules/project-structure.mdc · 37 lines

What it actually says

@axiosleo/koapp Project Structure

This is a Node.js web framework built on Koa.js for rapid application development.

Core Architecture

The main entry point is index.js, which exports all framework components:

  • Applications: KoaApplication, SocketApplication, WebSocketApplication
  • Core Classes: Router, Controller, Model
  • Utilities: Response helpers, middlewares, context initialization

Key Directories

  • src/ - Framework source code
    • apps/ - Application types (Koa, Socket, WebSocket)
    • workflows/ - Request processing workflows
    • middlewares/ - Custom middleware implementations
  • assets/ - Templates and static assets
    • tmpl/ - Project scaffolding templates
  • commands/ - CLI command implementations
  • tests/ - Test files and examples
  • bin/ - Executable CLI entry point

Application Types

  1. KoaApplication - Standard HTTP web server (extends Application)
  2. SocketApplication - TCP socket server (extends Application)
  3. WebSocketApplication - Native WebSocket server (extends SocketApplication)

KoaApplication and SocketApplication extend the base Application class. WebSocketApplication extends SocketApplication, inheriting connection management methods.

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. 1mo ago First seen · 37 lines · 307 tokens per session scan A 070fd07e74e6

Subscribe to this mod's changes

project-structure is a cursor rule published in the GitHub repository AxiosLeo/node-koapp (143 stars, last pushed yesterday), licensed MIT. It adds 307 tokens to every session, about $0.0012 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.