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react-patterns SKILL.md skillA

react-patterns from giuseppe-trisciuoglio/developer-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add giuseppe-trisciuoglio/developer-kit/react-patterns@git:20260324.a02e282

Pins git:20260324.a02e282 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: giuseppe-trisciuoglio/developer-kit
Path: plugins/developer-kit-typescript/skills/react-patterns/SKILL.md
Versions recorded: 5
Latest version: git:20260324.a02e282, committed Mar 24, 2026
First version recorded: Feb 7, 2026
Size: 9,768 bytes
Repository stars: 367
License: MIT

Provides comprehensive React 19 patterns for Server Components, Server Actions, useOptimistic, useActionState, useTransition, concurrent features, Suspense boundaries, and TypeScript integration. Generates executable code patterns, validates security for public endpoints, and optimizes performance with React Compiler or manual memoization. Proactively use when building React 19 applications with Next.js App Router, implementing optimistic UI, or optimizing concurrent rendering.

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 19 Development Patterns

## Overview

React 19 patterns for Next.js App Router, Server Actions, optimistic UI, and concurrent features. See Quick Reference for API summary and Examples for copy-paste patterns.

## When to Use

- Building React 19 applications with Next.js App Router
- Implementing optimistic UI with `useOptimistic` or `useTransition`
- Creating Server Actions with form validation
- Migrating from class components to hooks
- Optimizing concurrent rendering with React Compiler
- Managing complex state with `useReducer` or custom hooks
- Wrapping async operations in Suspense boundaries

## Quick Reference

| Pattern | Hook / API | Use Case |
|---------|-----------|----------|
| Local state | `useState` | Simple component state |
| Complex state | `useReducer` | Multi-action state machines |
| Side effects | `useEffect` | Subscriptions, data fetching |
| Shared state | `useContext` / `createContext` | Cross-component data |
| DOM access | `useRef` | Focus, measurements, timers |
| Performance | `useMemo` / `useCallback` | Expensive computations |
| Non-urgent updates | `useTransition` | Search/filter on large lists |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add giuseppe-trisciuoglio/developer-kit/react-patterns@sha256:4ed1d0462d12898f

The line at the top of this page pins the label git:20260324.a02e282, 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_kznazt6cvrgttgng.svg)](https://markdownregistry.com/a/art_kznazt6cvrgttgng)

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

Versions

The registry has recorded 5 versions of this file, between Feb 7, 2026 and Mar 24, 2026, about one every 11 days.

version	committed	commit	size	audit
git:20260324.a02e282 latest	2026-03-24	a02e282	9,768 B	A	view · diff
git:20260323.f468c03	2026-03-23	f468c03	9,490 B	A	view · diff
git:20260223.c6d4db1	2026-02-23	c6d4db1	33,106 B	A	view · diff
v2.0.0	2026-02-08	147afce	33,311 B	A	view · diff
v2.0.0	2026-02-07	1a732c7	31,350 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 (9768 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

giuseppe-trisciuoglio/developer-kit · 367 stars · license MIT · pushed 2026-09-10 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_kznazt6cvrgttgng
GET https://markdownregistry.com/api/v1/resolve?ref=giuseppe-trisciuoglio/developer-kit/react-patterns
GET https://markdownregistry.com/api/v1/blob/4ed1d0462d12898f275988d7e4e6cb0364cc942de5b432d01311e019717fe6ec

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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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