Agent skill

React 19

by Gentleman-Programming in Gentleman-Programming/Gentleman-Skills

React 19 patterns with React Compiler. An agent skill from Gentleman-Programming/Gentleman-Skills.

Apache-2.0Auto-check passedFrontend & Design

Install React 19

skills CLI

$ npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install Gentleman-Programming/Gentleman-Skills react-19 --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/Gentleman-Programming/Gentleman-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/curated/react-19 .claude/skills/react-19 && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "react-19" agent skill from https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19 into .claude/skills/react-19/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-19", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install Gentleman-Programming/Gentleman-Skills react-19 --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Gentleman-Programming/Gentleman-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/curated/react-19 .agents/skills/react-19 && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "react-19" agent skill from https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19 into .agents/skills/react-19/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-19", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install Gentleman-Programming/Gentleman-Skills react-19 --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Gentleman-Programming/Gentleman-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/curated/react-19 .cursor/skills/react-19 && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "react-19" agent skill from https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19 into .cursor/skills/react-19/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-19", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/Gentleman-Programming/Gentleman-Skills.git --path curated/react-19

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install Gentleman-Programming/Gentleman-Skills react-19 --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Gentleman-Programming/Gentleman-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/curated/react-19 .gemini/skills/react-19 && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "react-19" agent skill from https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19 into .gemini/skills/react-19/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-19", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install Gentleman-Programming/Gentleman-Skills react-19

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/Gentleman-Programming/Gentleman-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/curated/react-19 .github/skills/react-19 && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "react-19" agent skill from https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19 into .github/skills/react-19/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-19", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install Gentleman-Programming/Gentleman-Skills react-19 --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Gentleman-Programming/Gentleman-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/curated/react-19 .opencode/skills/react-19 && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "react-19" agent skill from https://github.com/Gentleman-Programming/Gentleman-Skills/tree/main/curated/react-19 into .opencode/skills/react-19/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react-19", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: react-19
GitHub stars: 657
Token cost: ~710 tokens
SKILL.md length: 46 words
Files: 1
Skills in repo: 23
Repo updated: Mar 28, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

React 19 patterns with React Compiler. An agent skill from Gentleman-Programming/Gentleman-Skills.

Tasks that involve React components
SKILL.md covers No Manual Memoization (REQUIRED), Imports (REQUIRED), Server Components First and When to use "use client", plus 4 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

React 19 is an agent skill from Gentleman-Programming/Gentleman-Skills. React 19 patterns with React Compiler. Trigger: When writing React components - no useMemo/useCallback needed.

Its SKILL.md is about 710 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering React components. It works with React. The repository describes itself as: Community-driven AI agent skills for Claude Code, OpenCode, and other AI assistants. Curated patterns and community contributions. The licence is Apache-2.0.

When your agent uses it

Tasks that involve React components

Example prompts

“/react-19”

What it can do on your machine

Read from SKILL.md and the folder at commit c8036a3. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

React 19 loads about 710 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 46 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~30
When it runs · the whole SKILL.md, loaded when a task matches: ~710

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Gentleman-Programming/Gentleman-Skills at commit c8036a3, republished under its Apache-2.0 licence (© Gentleman-Programming). 46 words, ~710 tokens.

Download SKILL.mdSave it as .claude/skills/react-19/SKILL.md (or your agent's skills folder).

name: react-19
description: React 19 patterns with React Compiler. Trigger: When writing React components - no useMemo/useCallback needed.
license: Apache-2.0
metadata.author: gentleman-programming
metadata.version: 1.0

No Manual Memoization (REQUIRED)

typescript

// ✅ React Compiler handles optimization automatically
function Component({ items }) {
  const filtered = items.filter(x => x.active);
  const sorted = filtered.sort((a, b) => a.name.localeCompare(b.name));

  const handleClick = (id) => {
    console.log(id);
  };

  return <List items={sorted} onClick={handleClick} />;
}

// ❌ NEVER: Manual memoization
const filtered = useMemo(() => items.filter(x => x.active), [items]);
const handleClick = useCallback((id) => console.log(id), []);

Imports (REQUIRED)

typescript

// ✅ ALWAYS: Named imports
import { useState, useEffect, useRef } from "react";

// ❌ NEVER
import React from "react";
import * as React from "react";

Server Components First

typescript

// ✅ Server Component (default) - no directive
export default async function Page() {
  const data = await fetchData();
  return <ClientComponent data={data} />;
}

// ✅ Client Component - only when needed
"use client";
export function Interactive() {
  const [state, setState] = useState(false);
  return <button onClick={() => setState(!state)}>Toggle</button>;
}

When to use "use client"

useState, useEffect, useRef, useContext
Event handlers (onClick, onChange)
Browser APIs (window, localStorage)

use() Hook

typescript

import { use } from "react";

// Read promises (suspends until resolved)
function Comments({ promise }) {
  const comments = use(promise);
  return comments.map(c => <div key={c.id}>{c.text}</div>);
}

// Conditional context (not possible with useContext!)
function Theme({ showTheme }) {
  if (showTheme) {
    const theme = use(ThemeContext);
    return <div style={{ color: theme.primary }}>Themed</div>;
  }
  return <div>Plain</div>;
}

Actions & useActionState

typescript

"use server";
async function submitForm(formData: FormData) {
  await saveToDatabase(formData);
  revalidatePath("/");
}

// With pending state
import { useActionState } from "react";

function Form() {
  const [state, action, isPending] = useActionState(submitForm, null);
  return (
    <form action={action}>
      <button disabled={isPending}>
        {isPending ? "Saving..." : "Save"}
      </button>
    </form>
  );
}

ref as Prop (No forwardRef)

typescript

// ✅ React 19: ref is just a prop
function Input({ ref, ...props }) {
  return <input ref={ref} {...props} />;
}

// ❌ Old way (unnecessary now)
const Input = forwardRef((props, ref) => <input ref={ref} {...props} />);

Keywords

react, react 19, compiler, useMemo, useCallback, server components, use hook

Files

Just SKILL.md in curated/react-19 of Gentleman-Programming/Gentleman-Skills.

Open the folder on GitHubat commit c8036a3

Compare with similar skills

React 19 next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

React 19 compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
React 19 this skillGentleman-Programming/Gentleman-Skills	657	—	~710	Automated safety check: Pass	Apache-2.0	6 mo ago
Web Artifacts Builderanthropics/skills	180k	40 repos	~769	Automated safety check: Pass	Apache-2.0	2 days ago
React Composition Patternsvercel-labs/openreview	1.7k	58 repos	~721	Automated safety check: Pass	MIT	7 mo ago
React Router Developmentremix-run/react-router	57k	1 repos	~1.5k	Automated safety check: Pass	MIT	today
React UI State PatternsChrisWiles/claude-code-showcase	6.1k	7 repos	~1.6k	Automated safety check: Pass	None	9 mo ago
Chakra UI v3 Builderchakra-ui/chakra-ui	41k	—	~3.1k	Automated safety check: Pass	MIT	today

Similar skills

Web Artifacts Builder
anthropics/skills
Official
Builds multi-component claude.ai HTML artifacts as a small React, TypeScript and Tailwind project, then bundles it into one shareable HTML file.
180k GitHub starsUsed in 40 repos~769 tokens
Frontend & DesignAuto-check passed
React Composition Patterns
vercel-labs/openreview
Official
Rules for structuring React components with composition instead of boolean props, covering compound components, lifted state, variants and React 19 changes.
1.7k GitHub starsUsed in 58 repos~721 tokens
Frontend & DesignAuto-check passed
React Router Development
remix-run/react-router
Guides work on React Router apps by first identifying whether the app uses Framework, Data or Declarative mode, then loading the matching reference and the installed package docs.
57k GitHub starsUsed in 1 repo~1.5k tokens
Frontend & DesignAuto-check passed
React UI State Patterns
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Sets patterns for React interfaces: when to show loading spinners or skeletons, how to surface errors, how to disable buttons during async work and how to handle empty lists.
6.1k GitHub starsUsed in 7 repos~1.6k tokens
Frontend & DesignAuto-check passed
Chakra UI v3 Builder
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React Component Performance
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Questions about React 19

What does React 19 do?

React 19 patterns with React Compiler. An agent skill from Gentleman-Programming/Gentleman-Skills. React 19 is an agent skill from Gentleman-Programming/Gentleman-Skills. React 19 patterns with React Compiler.

When should I use React 19?

React 19 fits situations like: tasks that involve React components.

How do I install React 19 in Claude Code?

Run `npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a claude-code`. Or copy the skill folder (curated/react-19 in Gentleman-Programming/Gentleman-Skills) into .claude/skills/react-19 in your project. Claude Code loads it when a task matches its description.

How do I install React 19 in Codex?

Run `npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a codex`. Or copy the skill folder (curated/react-19 in Gentleman-Programming/Gentleman-Skills) into .agents/skills/react-19 in your project. Codex loads it when a task matches its description.

Can I use React 19 in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Gentleman-Programming/Gentleman-Skills --skill react-19 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/react-19, .gemini/skills/react-19, .github/skills/react-19 and .opencode/skills/react-19 in your project.

What does React 19 need to run?

SKILL.md names no scripts, command-line tools or credentials: React 19 is instructions for the agent only.

Does React 19 access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is React 19 safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does React 19 use?

React 19 is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does React 19 use?

About 710 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to React 19?

Skills that share tags, products or a category with React 19: Web Artifacts Builder (anthropics/skills, 180k stars), React Composition Patterns (vercel-labs/openreview, 1.7k stars), React Router Development (remix-run/react-router, 57k stars) and React UI State Patterns (ChrisWiles/claude-code-showcase, 6.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains React 19?

Gentleman-Programming (a GitHub organization) maintains it in Gentleman-Programming/Gentleman-Skills, which has 657 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on March 28, 2026.

Source: Gentleman-Programming/Gentleman-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

React 19

Install React 19

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

No Manual Memoization (REQUIRED)

Imports (REQUIRED)

Server Components First

When to use "use client"

use() Hook

Actions & useActionState

ref as Prop (No forwardRef)

Keywords

Files

Compare with similar skills

Similar skills

Web Artifacts Builder

React Composition Patterns

React Router Development

React UI State Patterns

Chakra UI v3 Builder

React Component Performance

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Angular Architecture

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Angular Forms

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Questions about React 19

Install React 19

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

No Manual Memoization (REQUIRED)

Imports (REQUIRED)

Server Components First

When to use "use client"

use() Hook

Actions & useActionState

ref as Prop (No forwardRef)

Keywords

Files

Compare with similar skills

Similar skills

More from Gentleman-Programming/Gentleman-Skills

Related

Questions about React 19