agentmods.dev

react-best-practices

A set of performance guidelines for React components, hooks, data loading, effects, and bundles. React is a JavaScript library for building user interfaces.

In plain words
What is it for?
Use it when creating, reviewing, refactoring, or optimizing client-side React and Vite code.
Why use it?
It helps prevent slow loading, unnecessary requests, excessive re-rendering, oversized bundles, and misuse of useEffect.

Skill for Claude CodeCodex

267 +4 5mo ago A scan 88 tokens original MIT
View the source file poteto/noodle
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 skills/poteto/noodle/react-best-practices
Any agent
npx skills add poteto/noodle --skill react-best-practices
Clone the repo
git clone --depth 1 https://github.com/poteto/noodle

Made for: Claude Code, Codex.

Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,345 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 $0.00088 $0.01345
Opus 5 $0.00044 $0.00673
Sonnet 5 $0.00018 $0.00269
Haiku 4.5 $0.00009 $0.00135

Measured 3d ago against content hash 4e044ef5af8d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

react-best-practices 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 3d 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/skills/react-best-practices/SKILL.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

React Best Practices

Performance optimization guide for client-side React applications. Contains 47 rules across 8 categories, prioritized by impact. Adapted from Vercel Engineering's guidelines, filtered for client-only React + Vite (no Next.js / SSR).

When to Apply

Reference these guidelines when:

  • Writing new React components or hooks
  • Reviewing code for performance issues
  • Refactoring existing React code
  • Optimizing bundle size or render performance
  • Writing or reviewing useEffect usage

Rule Categories by Priority

Priority Category Impact Prefix
1 Eliminating Waterfalls CRITICAL async-
2 Bundle Size Optimization CRITICAL bundle-
3 Client-Side Data Fetching MEDIUM-HIGH client-
4 Re-render Optimization MEDIUM rerender-
5 useEffect Patterns MEDIUM useeffect-
6 Rendering Performance MEDIUM rendering-
7 JavaScript Performance LOW-MEDIUM js-
8 Advanced Patterns LOW advanced-

Quick Reference

1. Eliminating Waterfalls (CRITICAL)

  • async-defer-await — Move await into branches where actually used
  • async-parallel — Use Promise.all() for independent operations
  • async-dependencies — Use promise chaining for partial dependencies
  • async-api-routes — Start promises early, await late

2. Bundle Size Optimization (CRITICAL)

  • bundle-barrel-imports — Import directly, avoid barrel files
  • bundle-conditional — Load modules only when feature is activated
  • bundle-defer-third-party — Load analytics/logging after mount
  • bundle-preload — Preload on hover/focus for perceived speed

3. Client-Side Data Fetching (MEDIUM-HIGH)

  • client-event-listeners — Deduplicate global event listeners
  • client-passive-event-listeners — Use passive listeners for scroll/touch
  • client-swr-dedup — Use SWR for automatic request deduplication
  • client-localstorage-schema — Version and minimize localStorage data

Read the full file on GitHub · 125 lines

Files

What ships with it

48 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 125 lines · 88 tokens per session scan A 4e044ef5af8d

Subscribe to this mod's changes

react-best-practices is a skill published in the GitHub repository poteto/noodle (267 stars, last pushed 5mo ago), licensed MIT. It adds 88 tokens to every session and 1,345 once invoked, about $0.0004 per session on Opus 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.

FrontendReact
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