Official agent skill

React19 Concurrent Patterns

Preserve React 18 concurrent patterns and adopt React 19 APIs (useTransition, useDeferredValue, Suspense, use(), useOptimistic, Actions) during migration.

OfficialMITAuto-check passed

Install React19 Concurrent Patterns

skills CLI

$ npx skills add github/awesome-copilot --skill react19-concurrent-patterns -a claude-code

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

GitHub CLI

$ gh skill install github/awesome-copilot react19-concurrent-patterns --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/github/awesome-copilot.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/react19-concurrent-patterns .claude/skills/react19-concurrent-patterns && 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 "react19-concurrent-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns into .claude/skills/react19-concurrent-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react19-concurrent-patterns", 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/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns

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 github/awesome-copilot --skill react19-concurrent-patterns -a codex

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

GitHub CLI

$ gh skill install github/awesome-copilot react19-concurrent-patterns --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/react19-concurrent-patterns .agents/skills/react19-concurrent-patterns && 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 "react19-concurrent-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns into .agents/skills/react19-concurrent-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react19-concurrent-patterns", 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 github/awesome-copilot --skill react19-concurrent-patterns -a cursor

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

GitHub CLI

$ gh skill install github/awesome-copilot react19-concurrent-patterns --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/react19-concurrent-patterns .cursor/skills/react19-concurrent-patterns && 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 "react19-concurrent-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns into .cursor/skills/react19-concurrent-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react19-concurrent-patterns", 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/github/awesome-copilot.git --path skills/react19-concurrent-patterns

--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 github/awesome-copilot --skill react19-concurrent-patterns -a gemini-cli

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

GitHub CLI

$ gh skill install github/awesome-copilot react19-concurrent-patterns --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/github/awesome-copilot.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/react19-concurrent-patterns .gemini/skills/react19-concurrent-patterns && 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 "react19-concurrent-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns into .gemini/skills/react19-concurrent-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react19-concurrent-patterns", 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 github/awesome-copilot react19-concurrent-patterns

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 github/awesome-copilot --skill react19-concurrent-patterns -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/react19-concurrent-patterns .github/skills/react19-concurrent-patterns && 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 "react19-concurrent-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns into .github/skills/react19-concurrent-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react19-concurrent-patterns", 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 github/awesome-copilot --skill react19-concurrent-patterns -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 github/awesome-copilot react19-concurrent-patterns --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/react19-concurrent-patterns .opencode/skills/react19-concurrent-patterns && 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 "react19-concurrent-patterns" agent skill from https://github.com/github/awesome-copilot/tree/main/skills/react19-concurrent-patterns into .opencode/skills/react19-concurrent-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "react19-concurrent-patterns", 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: react19-concurrent-patterns
GitHub stars: 40k
Used in: 1 other repo
Token cost: ~722 tokens
SKILL.md length: 219 words
Files: 4 (incl. references)
Skills in repo: 417
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Preserve React 18 concurrent patterns and adopt React 19 APIs (useTransition, useDeferredValue, Suspense, use(), useOptimistic, Actions) during migration.

Works in 2 steps: Preserve existing React 18 concurrent… → Adopt new React 19 APIs worth…
SKILL.md covers Part 1 Preserve: React 18…, Part 2 React 19 New APIs and Migration Safety Rules
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

React19 Concurrent Patterns is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Preserve React 18 concurrent patterns and adopt React 19 APIs (useTransition, useDeferredValue, Suspense, use(), useOptimistic, Actions) during migration.

Its SKILL.md is about 720 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/react19-actions.md`, `references/react19-suspense.md` and `references/react19-use.md`).

It works with React. The repository describes itself as: Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot. The licence is MIT.

Example prompts

“/react19-concurrent-patterns”

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

Preserve existing React 18 concurrent patterns that must not be broken during migration
Adopt new React 19 APIs worth introducing after migration stabilizes

What it can do on your machine

Read from SKILL.md and the folder at commit 727ff2e. 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 javascript and bash).
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

React19 Concurrent Patterns loads about 722 tokens when it runs, and up to ~6.3k if it reads all its reference files. Until then it costs about 46 tokens; SKILL.md has 219 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~46
When it runs · the whole SKILL.md, loaded when a task matches: ~722
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~6.3k

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 github/awesome-copilot at commit 727ff2e, republished under its MIT licence (© github). 219 words, ~722 tokens.

Download SKILL.mdSave it as .claude/skills/react19-concurrent-patterns/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.

name: react19-concurrent-patterns
description: Preserve React 18 concurrent patterns and adopt React 19 APIs (useTransition, useDeferredValue, Suspense, use(), useOptimistic, Actions) during migration.

React 19 Concurrent Patterns

React 19 introduced new APIs that complement the migration work. This skill covers two concerns:

Preserve existing React 18 concurrent patterns that must not be broken during migration
Adopt new React 19 APIs worth introducing after migration stabilizes

Part 1 Preserve: React 18 Concurrent Patterns That Must Survive the Migration

These patterns exist in React 18 codebases and must not be accidentally removed or broken:

createRoot Already Migrated by the R18 Orchestra

If the R18 orchestra already ran, ReactDOM.render → createRoot is done. Verify it's correct:

jsx

// CORRECT React 19 root (same as React 18):
import { createRoot } from 'react-dom/client';
const root = createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

useTransition No Migration Needed

useTransition from React 18 works identically in React 19. Do not touch these patterns during migration:

jsx

// React 18 useTransition  unchanged in React 19:
const [isPending, startTransition] = useTransition();

function handleClick() {
  startTransition(() => {
    setFilteredResults(computeExpensiveFilter(input));
  });
}

useDeferredValue No Migration Needed

jsx

// React 18 useDeferredValue  unchanged in React 19:
const deferredQuery = useDeferredValue(query);

Suspense for Code Splitting No Migration Needed

jsx

// React 18 Suspense with lazy  unchanged in React 19:
const LazyComponent = React.lazy(() => import('./LazyComponent'));

function App() {
  return (
    <Suspense fallback={<Spinner />}>
      <LazyComponent />
    </Suspense>
  );
}

Part 2 React 19 New APIs

These are worth adopting in a post-migration cleanup sprint. Do not introduce these DURING the migration stabilize first.

For full patterns on each new API, read:

references/react19-use.md the use() hook for promises and context
references/react19-actions.md Actions, useActionState, useFormStatus, useOptimistic
references/react19-suspense.md Suspense for data fetching (the new pattern)

Migration Safety Rules

During the React 19 migration itself, these concurrent-mode patterns must be left completely untouched:

bash

# Verify nothing touched these during migration:
grep -rn "useTransition\|useDeferredValue\|Suspense\|startTransition" \
  src/ --include="*.js" --include="*.jsx" | grep -v "\.test\."

If the migrator touched any of these files, review the changes the migration should only have modified React API surface (forwardRef, defaultProps, etc.), never concurrent mode logic.

Files

SKILL.md and 3 other files (references) in skills/react19-concurrent-patterns of github/awesome-copilot.

SKILL.md
references/react19-actions.md
references/react19-suspense.md
references/react19-use.md

Open the folder on GitHubat commit 727ff2e

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in github/awesome-copilot, which our catalogue first saw on October 7, 2026.

boshi-xixixi/TraeSkill.trae/Skills/.agents/skills/react19-concurrent-patterns

Compare with similar skills

React19 Concurrent Patterns 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.

React19 Concurrent Patterns compared with similar skills
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React19 Concurrent Patterns this skillgithub/awesome-copilot	40k	1 repos	~722	Automated safety check: Pass	MIT	today
Web Artifacts Builderanthropics/skills	180k	40 repos	~769	Automated safety check: Pass	Apache-2.0	2 days ago
React Doctormakeplane/plane	60k	12 repos	~657	Automated safety check: Pass	AGPL-3.0	yesterday
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	yesterday
Electron Multi-Process ArchitectureiOfficeAI/AionUi	33k	1 repos	~1.8k	Automated safety check: Pass	Apache-2.0	28 days ago

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Questions about React19 Concurrent Patterns

What does React19 Concurrent Patterns do?

Preserve React 18 concurrent patterns and adopt React 19 APIs (useTransition, useDeferredValue, Suspense, use(), useOptimistic, Actions) during migration. React19 Concurrent Patterns is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Preserve React 18 concurrent patterns and adopt React 19 APIs (useTransition, useDeferredValue, Suspense, use(), useOptimistic, Actions) during migration.

How do I install React19 Concurrent Patterns in Claude Code?

Run `npx skills add github/awesome-copilot --skill react19-concurrent-patterns -a claude-code`. Or copy the skill folder (skills/react19-concurrent-patterns in github/awesome-copilot) into .claude/skills/react19-concurrent-patterns in your project. Claude Code loads it when a task matches its description.

How do I install React19 Concurrent Patterns in Codex?

Run `npx skills add github/awesome-copilot --skill react19-concurrent-patterns -a codex`. Or copy the skill folder (skills/react19-concurrent-patterns in github/awesome-copilot) into .agents/skills/react19-concurrent-patterns in your project. Codex loads it when a task matches its description.

Can I use React19 Concurrent Patterns 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 github/awesome-copilot --skill react19-concurrent-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/react19-concurrent-patterns, .gemini/skills/react19-concurrent-patterns, .github/skills/react19-concurrent-patterns and .opencode/skills/react19-concurrent-patterns in your project.

What does React19 Concurrent Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: React19 Concurrent Patterns is instructions for the agent only.

Does React19 Concurrent Patterns 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 React19 Concurrent Patterns 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 React19 Concurrent Patterns use?

React19 Concurrent Patterns is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does React19 Concurrent Patterns use?

About 722 tokens (SKILL.md is roughly 2.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 5.6k tokens, read only when the agent opens those files.

What are the alternatives to React19 Concurrent Patterns?

Skills that share tags, products or a category with React19 Concurrent Patterns: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 60k stars), React Composition Patterns (vercel-labs/openreview, 1.7k stars) and React Router Development (remix-run/react-router, 57k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains React19 Concurrent Patterns?

github (a GitHub organization, an official publisher) maintains it in github/awesome-copilot, which has 39,748 GitHub stars. The repository holds 417 skills in this directory. The repository was last updated on October 7, 2026.

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

Install React19 Concurrent Patterns

Facts

At a glance

What it does

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

React 19 Concurrent Patterns

Part 1 Preserve: React 18 Concurrent Patterns That Must Survive the Migration

createRoot Already Migrated by the R18 Orchestra

useTransition No Migration Needed

useDeferredValue No Migration Needed

Suspense for Code Splitting No Migration Needed

Part 2 React 19 New APIs

Migration Safety Rules

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from github/awesome-copilot

Related

Questions about React19 Concurrent Patterns