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How to Use Playwright Expert in Claude Code for Beginners

Cowrie
Cowrie
Dev @ Bswen

Purpose

This post demonstrates how to use the Playwright Expert skill in Claude Code for browser automation, testing websites, and validating user interactions.

Environment

  • Claude Code with claude-skills plugin
  • Node.js and npm installed
  • Basic familiarity with terminal commands

The Playwright Expert Skill

The Playwright Expert skill allows you to automate browser interactions through Claude Code. When you invoke it, the skill handles:

  • Automatic dev server detection: Finds your development server
  • Test script creation: Writes clean Playwright scripts to /tmp
  • Interactive testing: Tests pages, fills forms, takes screenshots
  • UX validation: Checks responsive design and user flows
  • Cross-browser testing: Validates functionality across browsers

I will use this skill to test a login flow and demonstrate common patterns.

Installation

First, ensure you have the claude-skills plugin installed in your Claude Code environment. The skill is available as playwright-skill in your skills list.

To verify it works, I run:

Terminal window
# Check available skills
claude skill list


# You should see playwright-skill in the output

Basic Usage

When I want to test a website, I simply invoke the skill:

Use playwright-skill to test https://example.com

The skill automatically:

  1. Detects if there’s a running dev server
  2. Creates a test script in /tmp
  3. Runs the test and captures results
  4. Returns screenshots and videos

Example 1: Testing a Login Flow

I needed to test a login form. Here’s what I did:

Terminal window
# Start the dev server first
npm run dev


# Then invoke Claude Code
cowrie@localhost:~/project$ claude

In Claude Code, I type:

Test the login flow at http://localhost:3000/login using playwright-skill

The skill creates a test script that:

  • Navigates to the login page
  • Fills in the username and password fields
  • Clicks the submit button
  • Verifies successful login
  • Takes a screenshot for documentation

The output looks like this:

/tmp/playwright-test-xxx.spec.ts
import { test, expect } from '@playwright/test';


test('login flow', async ({ page }) => {
  await page.goto('http://localhost:3000/login');


  // Fill login form
  await page.fill('input[name="username"]', 'testuser');
  await page.fill('input[name="password"]', 'testpass');


  // Submit form
  await page.click('button[type="submit"]');


  // Verify success
  await expect(page).toHaveURL(/.*dashboard/);
  await page.screenshot({ path: 'login-success.png' });
});

Example 2: Validating Responsive Design

I wanted to check if my site works on mobile devices. I used:

Use playwright-skill to test responsive design for https://mysite.com

The skill automatically tests across different viewports:

  • Desktop (1920x1080)
  • Tablet (768x1024)
  • Mobile (375x667)

This helps catch layout issues before users do.

Example 3: Form Testing

When testing a complex registration form, I simply say:

Test the registration form with playwright-skill

The skill:

  • Fills all required fields
  • Tests validation errors
  • Submits the form
  • Verifies success state

Common Patterns

Triggering the Skill

These phrases work well:

  • “Use playwright-skill to test…”
  • “Test the login flow with playwright-skill”
  • “Validate responsive design using playwright-skill”
  • “Check the form with playwright-skill”

Best Practices

DO:

  • Start your dev server before invoking the skill
  • Be specific about what to test (login flow, form, navigation)
  • Test on localhost during development
  • Check the generated scripts in /tmp for learning

DON’T:

  • Forget to have a dev server running
  • Test production environments without caution
  • Ignore the test output and screenshots
  • Skip manual verification of automated results

How It Fits With Other Skills

Playwright Expert works well with:

  • tdd-workflow: Write tests first, then implement
  • e2e: End-to-end testing for critical user flows
  • security-review: Validate authentication flows

This integration ensures quality development from multiple angles.

The Why

I think the key benefit of Playwright Expert is:

It removes the friction of browser automation

Without this skill, I would need to:

  • Install and configure Playwright
  • Write test scripts from scratch
  • Handle browser driver setup
  • Debug test infrastructure issues

With the skill, I focus on what to test, not how to set up the testing framework. The skill handles boilerplate, I handle test logic.

Summary

In this post, I showed how to use Playwright Expert skill in Claude Code for browser automation and testing. The key point is that the skill abstracts away Playwright setup complexity, letting you focus on test scenarios and user flows instead of framework configuration.

Final Words + More Resources

My intention with this article was to help others share my knowledge and experience. If you want to contact me, you can contact by email: Email me

Here are also the most important links from this article along with some further resources that will help you in this scope:

Oh, and if you found these resources useful, don’t forget to support me by starring the repo on GitHub!

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