What is 11-frontend-react?

A set of frontend coding rules for React 18, a JavaScript user-interface library, in an Electron desktop application. It also specifies ShadCN UI, Tailwind CSS, and strict TypeScript practices.

Use it when building or changing React screens, authenticated pages, forms, data tables, or other frontend code in the specified project.

It gives contributors consistent rules for components, forms, state, API calls, accessibility, and styling instead of leaving those choices unclear.

11-frontend-react — Cursor rule for Cursor by bybren-llc: A set of frontend coding rules for React 18…

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/bybren-llc/a-safe-pulse/11-frontend-react

Clone the repo

git clone --depth 1 https://github.com/bybren-llc/a-safe-pulse

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/bybren-llc/a-safe-pulse/11-frontend-react.svg)](https://agentmods.dev/rules/bybren-llc/a-safe-pulse/11-frontend-react)

Your own site

<a href="https://agentmods.dev/rules/bybren-llc/a-safe-pulse/11-frontend-react"><img src="https://agentmods.dev/badge/rules/bybren-llc/a-safe-pulse/11-frontend-react.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 436 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 100% copy Near-identical to another mod 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	$0.00000	$0.00436
Opus 5	$0.00000	$0.00218
Sonnet 5	$0.00000	$0.00087
Haiku 4.5	$0.00000	$0.00044

Measured today against content hash fcd6e6ba4712, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

11-frontend-react 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 today.

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

This is a copy

100% identical to 11-frontend-react — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

docs/archive/harness-upstream/cursor-rules/11-frontend-react.mdc · 75 lines

What it actually says

Frontend React Rules

These rules apply when working on frontend code in sdk/.

Technology Stack

Framework: React 18
Desktop: Electron
UI Library: ShadCN UI components
Styling: Tailwind CSS
Type Safety: TypeScript (strict mode)

Component Patterns

Use functional components with hooks (no class components)
Use TypeScript interfaces for all props
Follow ShadCN UI component patterns for consistency
Use Tailwind utility classes for styling (avoid custom CSS)

Authenticated Pages

For pages requiring authentication, see patterns_library/ui/authenticated-page.md.

Forms

For forms with validation, see patterns_library/ui/form-with-validation.md (React Hook Form + Zod).

Data Tables

For paginated data tables, see patterns_library/ui/data-table.md.

State Management

Use React hooks for local state
Use context for shared state within feature boundaries
Avoid prop drilling beyond 2 levels

API Integration

All API calls must handle loading, error, and success states
Use proper error boundaries so analytics/API failures do not crash the app
Handle authentication token refresh transparently

Accessibility

All interactive elements must be keyboard-navigable
Use semantic HTML elements
Include ARIA labels where needed
Follow ShadCN UI's built-in accessibility patterns

Validation Commands

# TypeScript validation
{{TYPE_CHECK_COMMAND}}

# Linting
{{LINT_COMMAND}}

# Build verification
{{BUILD_COMMAND}}

Key References

See patterns_library/ui/ for UI component patterns
See docs/security/SECURITY_FIRST_ARCHITECTURE.md for client-side security
See CONTRIBUTING.md for full workflow details

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.

today First seen · 75 lines · 0 tokens per session scan A fcd6e6ba4712

Subscribe to this mod's changes

11-frontend-react is a cursor rule published in the GitHub repository bybren-llc/a-safe-pulse (9 stars, last pushed 5mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 436 tokens. A static security scan graded it A with 0 findings. It is 100% identical to 11-frontend-react, differing in 0 lines, and is treated as a copy.

Frontend Languages React TypeScript

11-frontend-react