11-frontend-react

11-frontend-react is a cursor rule for Cursor from bybren-llc/safe-agentic-workflow. It costs 0 tokens per session (436 once invoked), scanned A, original, MIT.

A set of frontend rules for building user interfaces with React, a JavaScript interface library, plus Electron, ShadCN UI, Tailwind CSS, and TypeScript. It covers components, forms, data tables, application state, API requests, and accessibility.

In plain words
What is it for?
Use it when developing or changing React screens, authenticated pages, forms, tables, shared state, API connections, or styling.
Why use it?
It keeps interface code consistent and helps avoid common problems such as missing loading and error states, unsafe types, and inaccessible controls.

Cursor rule for Cursor

Written for Cursor: installed under .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/bybren-llc/safe-agentic-workflow/11-frontend-react
Clone the repo
git clone --depth 1 https://github.com/bybren-llc/safe-agentic-workflow

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 11-frontend-react

README.md
[![agentmods](https://agentmods.dev/badge/rules/bybren-llc/safe-agentic-workflow/11-frontend-react.svg)](https://agentmods.dev/rules/bybren-llc/safe-agentic-workflow/11-frontend-react)
Your own site
<a href="https://agentmods.dev/rules/bybren-llc/safe-agentic-workflow/11-frontend-react"><img src="https://agentmods.dev/badge/rules/bybren-llc/safe-agentic-workflow/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 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 $0.00000 $0.00436
Opus 5 $0.00000 $0.00218
Sonnet 5 $0.00000 $0.00087
Haiku 4.5 $0.00000 $0.00044

Measured 2d ago 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 2d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.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.

  1. 2d ago 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/safe-agentic-workflow (406 stars, last pushed 1mo 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.