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Agent skill

React

by magnus919 in magnus919/agent-skills

Operate React applications as a named tool: inspect and diagnose React/Vite projects, design component boundaries and state flow, implement accessible responsive UI, and verify behavior with the…

MITAuto-check passedFrontend & Design

Install React

skills CLI
$ npx skills add magnus919/agent-skills --skill react -a claude-code

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

GitHub CLI
$ gh skill install magnus919/agent-skills react --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/magnus919/agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/react .claude/skills/react && 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/

Facts

Skill name
react
GitHub stars
111
Token cost
~1.4k tokens
SKILL.md length
575 words
Files
7 (incl. scripts, references)
Skills in repo
129
Repo updated
First seen
Licence
MIT

At a glance

Operate React applications as a named tool: inspect and diagnose React/Vite projects, design component boundaries and state flow, implement accessible responsive UI, and verify behavior with the…

  • Works in 6 steps: Diagnose before editing. Run… → Define the component contract. Identify… → Implement with explicit data flow.… → …
  • A task explicitly involves React
  • SKILL.md covers Operating loop, React-specific rules, Routing and handoffs and Reference routing, plus 2 more sections
  • Runs Python scripts from its folder

What it does

React is an agent skill from magnus919/agent-skills. Operate React applications as a named tool: inspect and diagnose React/Vite projects, design component boundaries and state flow, implement accessible responsive UI, and verify behavior with the project's tests. Use when a task explicitly involves React, JSX/TSX, React hooks, React Router, Vite React configuration, or React build failures. Do not use for framework-agnostic frontend strategy (route to frontend-engineering), browser automation (route to playwright), accessibility policy or audits (route to…

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files, including scripts and reference files (for example `README.md`, `evals/evals.json` and `references/component-and-state.md`). Compatibility notes: The bundled diagnostic script uses Python 3.8+ standard library only. Running or building an application requires its repository package manager and Node.js.

It sits in Frontend & Design, covering React components, Browser automation and Accessibility. It works with React, Vite, Playwright and React Router. The repository describes itself as: Curated collection of AI agent skills for Hermes and other agent frameworks. The licence is MIT.

When your agent uses it

  • A task explicitly involves React
  • Vite React configuration
  • React build failures
  • Framework-agnostic frontend strategy (route to frontend-engineering)

Example prompts

  • “/react”

Requirements

  • Python 3
  • Node.js
  • Compatibility (from SKILL.md): The bundled diagnostic script uses Python 3.8+ standard library only. Running or building an application requires its repository package manager and Node.js.

Workflow steps

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

  1. Diagnose before editing. Run scripts/react-doctor.py --json [PROJECT] and
  2. Define the component contract. Identify the page/feature boundary,
  3. Implement with explicit data flow. Prefer local state for local behavior,
  4. Keep UI resilient. Render a useful loading, empty, error, and success
  5. Build for the browser. Use semantic HTML, keyboard-operable controls,
  6. Verify in layers. Run the narrowest existing unit/component test, then

What it can do on your machine

Read from SKILL.md and the folder at commit 96fbe07. 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

    Ships 2 files in scripts/ (Python), which the agent can run.

    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.

  • Compatibility

    The bundled diagnostic script uses Python 3.8+ standard library only. Running or building an application requires its repository package manager and Node.js.

    From compatibility in the SKILL.md frontmatter.

Context cost

React loads about 1.4k tokens when it runs, and up to ~2.8k if it reads all its reference files. Until then it costs about 148 tokens; SKILL.md has 575 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~148
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.8k

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); the scripts in this folder are not scanned.

SKILL.md

The full file from magnus919/agent-skills at commit 96fbe07, republished under its MIT licence (© magnus919). 575 words, ~1,416 tokens.

Download SKILL.mdSave it as .claude/skills/react/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.
name
react
description
Operate React applications as a named tool: inspect and diagnose React/Vite projects, design component boundaries and state flow, implement accessible responsive UI, and verify behavior with the project's tests. Use when a task explicitly involves React, JSX/TSX, React hooks, React Router, Vite React configuration, or React build failures. Do not use for framework-agnostic frontend strategy (route to frontend-engineering), browser automation (route to playwright), accessibility policy or audits (route to web-accessibility), or non-React mobile apps (route to mobile-development).
compatibility
The bundled diagnostic script uses Python 3.8+ standard library only. Running or building an application requires its repository package manager and Node.js.
license
MIT
metadata.tags
react, jsx, tsx, vite, hooks, components, router, frontend
metadata.source
https://react.dev/

React Application Engineering

Use this skill for the React-specific implementation layer. Preserve the project's existing React version, package manager, build scripts, styling conventions, and routing model unless the user asks for a migration.

Operating loop

  1. Diagnose before editing. Run scripts/react-doctor.py --json [PROJECT] and inspect package.json, source entry points, Vite config, TypeScript config, routes, and test scripts. The diagnostic is bounded and read-only.
  2. Define the component contract. Identify the page/feature boundary, inputs and outputs, owned state, server state, loading/empty/error/success states, and side effects. Keep reusable components independent of route globals and avoid passing state through unrelated layers.
  3. Implement with explicit data flow. Prefer local state for local behavior, context only for genuinely cross-cutting concerns, and the existing server state/cache solution for remote data. Keep effects for synchronization with external systems; derive values during render rather than storing duplicates.
  4. Keep UI resilient. Render a useful loading, empty, error, and success experience. Cancel or ignore stale async work, handle aborts, and avoid setting state after an obsolete request. Preserve stable keys and avoid mutating props or state.
  5. Build for the browser. Use semantic HTML, keyboard-operable controls, visible focus, responsive layout, and stable accessible names. For detailed accessibility requirements, load web-accessibility.
  6. Verify in layers. Run the narrowest existing unit/component test, then lint/typecheck, then the production build. For browser-level flows use playwright, not ad hoc browser automation. Report the exact commands and any environment-dependent checks that were skipped.

React-specific rules

  • Hooks run unconditionally and in the same order on every render; never call them in branches, loops, event handlers, or nested functions.
  • Effects synchronize with external systems. Do not use an effect to calculate a value that can be derived from props/state, or to mirror props into state without a clear user-editing requirement.
  • Use functional updates when the next state depends on the previous state. Give list items stable keys from domain identity, not array indexes when the list can reorder, insert, or delete.
  • Treat event handlers as user intent and keep them separate from render-time computation. Disable or guard duplicate submissions and expose pending state.
  • Keep API response validation and transformation at the integration boundary; components should consume a typed, predictable view model.
  • Do not add a state library or router solely because it is popular. First map ownership and use the project's existing choices.
  • In Vite, expose only intentionally public variables using the project's documented prefix (normally VITE_); never put secrets in client bundles. Read references/vite-diagnostics.md for environment, build, and deployment checks.
Show full SKILL.md (160 more words)Show less

Routing and handoffs

  • Component architecture, responsive implementation, performance budgets, and general frontend testing: frontend-engineering.
  • Browser E2E authoring, locator choice, network interception, and Playwright runs: playwright.
  • Semantic structure, keyboard/focus behavior, WCAG acceptance evidence, and accessibility audits: web-accessibility.
  • React Native, Expo, Android, or iOS implementation: mobile-development.

Reference routing

Load whenReference
Choosing component boundaries, state ownership, effects, or async UI behaviorreferences/component-and-state.md
Diagnosing Vite env exposure, dependency versions, build output, or deployment pathsreferences/vite-diagnostics.md

Included script

scripts/react-doctor.py is a read-only, dependency-free diagnostic. Run scripts/react-doctor.py --help for options. It accepts a project directory, checks common React/Vite signals, and emits human-readable or bounded JSON output. It does not install packages, execute project scripts, access the network, or print environment values.

Completion boundary

Stop when the requested React change is implemented, the project's relevant checks have run, and remaining failures are reported with their command and root-cause evidence. Do not broaden a component task into a framework migration or an accessibility audit without explicit scope.

© magnus919, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 6 other files (scripts, references) in react of magnus919/agent-skills.

  • SKILL.md
  • README.md
  • evals/evals.json
  • references/component-and-state.md
  • references/vite-diagnostics.md
  • scripts/react-doctor.py
  • scripts/test_react_doctor.py

Open the folder on GitHubat commit 96fbe07

Compare with similar skills

React 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 compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
React this skillmagnus919/agent-skills111—~1.4kAutomated safety check: PassMIT
React Router Developmentremix-run/react-router57k1 repos~1.5kAutomated safety check: PassMIT
Local Testinglobehub/lobe-ui2.2k—~2.1kAutomated safety check: PassMIT
Frontend UI FunctionalvictorGPT/vibeusage131—~939Automated safety check: PassMIT
Liteyuki Webui FrontendLiteyukiStudio/LiteyukiBot157—~2.5kAutomated safety check: PassCustom licence
Stitch to React and Vite Dashboardgoogle-labs-code/stitch-skills8.4k—~914Automated safety check: NotesApache-2.0

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  • React Router Development

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  • Local Testing

    lobehub/lobe-ui

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Works with

Categories

Questions about React

What does React do?

Operate React applications as a named tool: inspect and diagnose React/Vite projects, design component boundaries and state flow, implement accessible responsive UI, and verify behavior with the…. React is an agent skill from magnus919/agent-skills. Operate React applications as a named tool: inspect and diagnose React/Vite projects, design component boundaries and state flow, implement accessible responsive UI, and verify behavior with the project's tests.

When should I use React?

React fits situations like: A task explicitly involves React; vite React configuration; React build failures; framework-agnostic frontend strategy (route to frontend-engineering).

How do I install React in Claude Code?

Run `npx skills add magnus919/agent-skills --skill react -a claude-code`. Or copy the skill folder (react in magnus919/agent-skills) into .claude/skills/react in your project. Claude Code loads it when a task matches its description.

How do I install React in Codex?

Run `npx skills add magnus919/agent-skills --skill react -a codex`. Or copy the skill folder (react in magnus919/agent-skills) into .agents/skills/react in your project. Codex loads it when a task matches its description.

Can I use React 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 magnus919/agent-skills --skill react -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, .gemini/skills/react, .github/skills/react and .opencode/skills/react in your project.

What does React need to run?

Going by SKILL.md and its folder, React needs Python for the scripts in its folder. Our summary lists: Python 3; Node.js. Compatibility (from SKILL.md): The bundled diagnostic script uses Python 3.8+ standard library only. Running or building an application requires its repository package manager and Node.js..

Does React 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 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does React use?

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

How many tokens does React use?

About 1.4k tokens (SKILL.md is roughly 5.7k 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 1.4k tokens, read only when the agent opens those files.

What are the alternatives to React?

Skills that share tags, products or a category with React: React Router Development (remix-run/react-router, 57k stars), Local Testing (lobehub/lobe-ui, 2.2k stars), Frontend UI Functional (victorGPT/vibeusage, 131 stars) and Liteyuki Webui Frontend (LiteyukiStudio/LiteyukiBot, 157 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains React?

magnus919 (a GitHub user) maintains it in magnus919/agent-skills, which has 111 GitHub stars. The repository holds 129 skills in this directory. The repository was last updated on October 6, 2026.

Source: magnus919/agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.