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react-best-practices SKILL.md skillA

react-best-practices from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add majiayu000/spellbook/react-best-practices@git:20260530.1e1fca0

Pins git:20260530.1e1fca0 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: majiayu000/spellbook
Path: skills/react-best-practices/SKILL.md
Versions recorded: 2
Latest version: git:20260530.1e1fca0, committed May 30, 2026
First version recorded: Apr 1, 2026
Size: 4,240 bytes
Repository stars: 290
License: MIT

React and Next.js performance playbook distilled from Vercel Engineering guidance. Use when building, reviewing, or refactoring React/Next.js code for waterfalls, bundle size, rendering cost, and client/server data flow.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# React Best Practices

Practical React and Next.js guidance for performance-sensitive product work.

This skill is a self-contained distillation of the Vercel React performance guidance so it can be installed and used directly inside Spellbook.

## When To Use

Use this skill when the user asks to:
- build or refactor React components
- improve Next.js performance
- reduce bundle size
- remove data-fetch waterfalls
- fix expensive rerenders
- review frontend code for performance issues

## Priority Order

Always check higher-priority categories first.

| Priority | Category | Focus |
|----------|----------|-------|
| 1 | Waterfalls | start async work early, await late, parallelize independent fetches |
| 2 | Bundle size | avoid barrel imports, defer heavy code, split by feature |
| 3 | Server-side performance | dedupe work, minimize serialization, prefer server execution |
| 4 | Client data fetching | dedupe requests, avoid redundant listeners and client churn |
| 5 | Rerenders | reduce subscriptions, stabilize dependencies, move expensive work |
| 6 | Rendering | avoid hydration flicker, reduce DOM/SVG cost, optimize long lists |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add majiayu000/spellbook/react-best-practices@sha256:5d221600c5afb687

The line at the top of this page pins the label git:20260530.1e1fca0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_h3edu5yd3kqytisl.svg)](https://markdownregistry.com/a/art_h3edu5yd3kqytisl)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Apr 1, 2026 and May 30, 2026, about one every 59 days.

version	committed	commit	size	audit
git:20260530.1e1fca0 latest	2026-05-30	1e1fca0	4,240 B	A	view · diff
git:20260401.b4dee1b	2026-04-01	b4dee1b	4,245 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4240 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

majiayu000/spellbook · 290 stars · license MIT · pushed 2026-11-04 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_h3edu5yd3kqytisl
GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/react-best-practices
GET https://markdownregistry.com/api/v1/blob/5d221600c5afb687b0b4539bbfb9490e737398adf028e2673fde56621564bf82

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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