react-router

react-router is a cursor rule for Cursor from iloveitaly/llm-ide-rules. It costs 0 tokens per session (977 once invoked), scanned A, original, MIT.

A set of rules for building pages with React Router, a library that manages navigation and data loading in React applications.

In plain words
What is it for?
It helps create React Router v7 route files, client data loaders, typed route parameters, query-string handling, and page metadata.
Why use it?
It gives the coding agent one consistent way to define routes, load data, handle URL values, and generate links.

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/iloveitaly/llm-ide-rules/react-router
Clone the repo
git clone --depth 1 https://github.com/iloveitaly/llm-ide-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.

agentmods badge for react-router

README.md
[![agentmods](https://agentmods.dev/badge/rules/iloveitaly/llm-ide-rules/react-router.svg)](https://agentmods.dev/rules/iloveitaly/llm-ide-rules/react-router)
Your own site
<a href="https://agentmods.dev/rules/iloveitaly/llm-ide-rules/react-router"><img src="https://agentmods.dev/badge/rules/iloveitaly/llm-ide-rules/react-router.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 977 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00000 $0.00977
Opus 5 $0.00000 $0.00489
Sonnet 5 $0.00000 $0.00195
Haiku 4.5 $0.00000 $0.00098

Measured 4d ago against content hash 145f51282611, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

react-router 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/react-router.mdc · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

React Router

  • You are using the latest version of React Router (v7).
  • Always include the suffix Page when naming the default export of a route.
  • The primary export in a routes file should specify loaderData like export default function RouteNamePage({ loaderData }: Route.ComponentProps). loaderData is the return value from clientLoader.
  • Use href("/products/:id", { id: "abc123" }) to generate a url path for a route managed by the application.
    • Look at routes.ts to determine what routes and path parameters exist.
  • Use export async function clientLoader(loaderArgs: Route.ClientLoaderArgs) to define a clientLoader on a route.
  • Do not define Route.* types, these are autogenerated and can be imported from import type { Route } from "./+types/routeFileName"
  • If URL parameters or query string values need to be checked before rendering the page, do this in a clientLoader and not in a useEffect
  • Never worry about generating types using pnpm
  • Use <AllMeta /> instead of MetaFunction or individual <meta /> tags
  • Use the following pattern to reference query string values (i.e. ?theQueryStringParam=value)
const [searchParams, _setSearchParams] = useSearchParams()
// searchParams contains the value of all query string parameters
const queryStringValue = searchParams.get("theQueryStringParam")

Loading Mock Data

Don't load mock data in the component function with useEffect. Instead, load data in a clientLoader:

// in mock.ts
export async function getServerData(options: any) {
  // ...
}

// in web/app/routes/**/*.ts
export async function clientLoader(loaderArgs: Route.ClientLoaderArgs) {
  // no error reporting is needed, this will be handled by the `getServerData`
  // mock loading functions should return result in a `data` key
  const { data } = await getServerData({
    /* ... */
  });

  // the return result here is available in `loaderData`
  return data;
}

Read the full file on GitHub · 95 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 · 95 lines · 0 tokens per session scan A 145f51282611

Subscribe to this mod's changes

react-router is a cursor rule published in the GitHub repository iloveitaly/llm-ide-rules (13 stars, last pushed 4d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 977 tokens. 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.