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Guide · Agent skill

How to use the Frontend Engineer agent skill

Updated · written with AI from the project's own documentation and checked against our catalogue data

The frontend-engineer skill is a set of written instructions that tells an AI agent how to build websites and web apps with a strict checklist: build the project, run it locally, open it in a browser, take screenshots and check for errors before calling the work finished. This guide is for anyone who has not used agent skills before and wants to install, trigger and sanity-check it. By the end you will know what it needs, how to install it, and how to ask for work in a way that activates it.

Frontend Engineer Workflownanocoai/nanoclaw · MIT

Quick start

  1. 1Download and unzip. Download the ZIP from this page and unzip it to get the SKILL.md file.
  2. 2Place the skill folder. Copy the folder into ~/.claude/skills/ for personal use, or into .claude/skills/ inside a project.
  3. 3Or upload in the Claude apps. In the Claude apps, open Settings, go to Capabilities, then Skills, and upload the skill.
  4. 4Install the requirements. Make sure Node.js with pnpm and the agent-browser command-line tool are available. Add the Vercel CLI and your own token only if you plan to deploy.
  5. 5Ask for a web task. Describe the page or feature, the stack and the sizes you want checked, in plain language.
  6. 6Review screenshots and deploy. Check the desktop and tablet screenshots and the console result. Approve any deploy only after you have reviewed the command.

What the frontend-engineer skill makes the agent do

The skill's core rule is that the agent must not say a job is done until it has visually verified the result in a real browser. Screenshots are the proof it uses.

The workflow runs in order: understand the existing project first, write code under stated standards, run a build and fix all errors, start a dev server and check the page in a browser, deploy only after checks pass, then verify the live URL. The standards cover TypeScript types, semantic HTML, one h1 per page, alt text on images, mobile-first CSS, and a 4.5:1 contrast ratio for text.

  • Checks a desktop (1280px) and tablet (about 768px) layout with screenshots
  • Looks for console errors and horizontal scrollbars or layout overflow
  • Warns against components defined inside other components and leftover console.log calls
  • Asks for a report with the tech stack, live URL if deployed, screenshots and known limitations

Install the skill from the ZIP or the Claude apps

Download the ZIP from this page and unzip it. The package contains a single file, SKILL.md. Put the unzipped skill folder in one of these locations:

  • Personal skills: ~/.claude/skills/ so it is available across your projects
  • Project skills: .claude/skills/ inside a specific project folder
  • Claude apps: open Settings, go to Capabilities, then Skills, and upload the skill there

Make sure the requirements are in place

The skill's examples assume a Node.js setup that uses pnpm, because the commands run pnpm run build and pnpm run dev. The browser checks need the agent-browser command-line tool. Deployment needs the Vercel CLI and a valid Vercel token. The source notes that the deploy example uses a placeholder token, so you must replace it with your own before deploying.

A companion deployment skill such as vercel-cli is suggested but optional. The skill says it pairs with one where one is installed.

  • Node.js with pnpm
  • agent-browser command-line tool
  • Vercel CLI and a valid Vercel token (only for deployment)
  • Optional: a deployment skill such as vercel-cli

Trigger the skill with a natural request

You do not need a special command. Ask for a frontend task in plain language and mention that you want it built, tested and checked in a browser. The skill is written for work on websites and web applications, so name the web tech when you can.

Describe the page, the stack and the target. A specific request gives the agent a clear checklist to verify against.

  • "Build a landing page for my bakery in plain HTML and CSS, check it in a browser at desktop and tablet sizes, and send me the screenshots."
  • "Add a pricing section to this Next.js app using the existing card component. Build it, screenshot it, and fix any layout overflow."
  • "Make the signup form in this Tailwind project accessible and responsive, then verify it in the browser."

Safety notes: scripts and network access

The skill runs scripts and uses the network. It runs builds and a dev server, opens local and remote pages with agent-browser, and can run a Vercel deploy command. Deploying to production changes a live site, so review what the agent is about to run before approving a deploy.

The deploy example includes the placeholder token value. Do not leave a placeholder or a real token in files you share. Use your own credentials through your normal Vercel setup and check the command before it runs.

  • Review the deploy command and project path before approving
  • Do not paste real tokens into the skill file or chat
  • Production deploys affect a real site; test on the local build first
vercel deploy --yes --prod --token placeholder --cwd /path/to/project

Tips for getting good results

The skill asks the agent to read existing patterns before it writes code. Point it at an existing project with package.json, components and design tokens so it reuses them rather than building new ones.

If a screenshot still looks wrong, the skill's iteration protocol asks the agent to fix, rebuild, re-test and compare. It also says that if the same issue persists after three iterations, the agent should report it as a known limitation.

  • Give it an existing codebase when you have one, so it can follow your components and styling
  • Ask for both desktop and tablet screenshots when layout matters
  • Use it for real pages, not one-line text edits, where the full cycle is overhead
  • Expect a report listing known limitations if something stays unresolved

What people use it for

  • Building a simple landing page in plain HTML and CSS and checking it at desktop and tablet widths
  • Adding a section to an existing React or Next.js app while reusing its components
  • Making a Tailwind form accessible and checking it in a real browser
  • Verifying a deployed site against the local build after a release

Frequently asked questions

How do I install the frontend-engineer agent skill?

Download the ZIP from this page and unzip it. Place the folder in ~/.claude/skills/ for personal use or in .claude/skills/ inside a project, or upload it in the Claude apps under Settings, Capabilities, Skills.

What do I need to use the frontend-engineer skill?

You need Node.js with pnpm, since the examples run pnpm run build and pnpm run dev, plus the agent-browser command-line tool for screenshots. Vercel CLI and a valid Vercel token are only needed for deployment, and a companion skill such as vercel-cli is optional.

Is the frontend-engineer skill free and what is its licence?

The source lists the licence as MIT. This page does not state pricing, so check the listing for any cost details.

Does the skill deploy my site automatically?

No. Deployment is step five of the workflow and runs only after checks pass. The example command uses a placeholder token, so you must supply your own valid token and review the command before it runs.

Does this skill work for projects that are not websites?

No. The rules are specific to React, Next.js and HTML/CSS web frontends, so it is not suited to other kinds of projects.

What are alternatives to this skill?

The source does not compare this skill with other tools. If you only need a quick throwaway edit, the skill's full build, screenshot and deploy cycle may be more than you need.

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Our verdict

Use this skill if you want an agent to build web pages and check them in a real browser before reporting success, especially with an existing React, Next.js or Tailwind codebase or for a simple landing page. Skip it for quick edits, non-web projects, or if you want deployments to be automatic and safe, since the deploy example needs your own token and production changes affect a live site.

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