Playwright Skill

by lackeyjb

Enables Claude to write and execute any Playwright automation on-the-fly - from simple page tests to complex multi-step flows.

npx skills add https://github.com/lackeyjb/playwright-skill --skill playwright-skill

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Playwright Browser Automation

Write and execute focused Playwright scripts for the user's request. Prefer the skill's executor and helpers, but use the full Playwright API when needed.

Path resolution

This skill can be installed in several locations, so resolve its directory first. Set SKILL_DIR to the directory containing this SKILL.md file, then run the commands below as written:

export SKILL_DIR=<absolute path of the directory containing this SKILL.md>
export TMP_DIR="$(node -p 'require("node:os").tmpdir()')"

If shell state does not persist between commands, substitute the literal paths for $SKILL_DIR and $TMP_DIR in each command instead.

Common installation paths:

Plugin system: ~/.claude/plugins/marketplaces/playwright-skill/skills/playwright-skill
Manual global: ~/.claude/skills/playwright-skill
Project-specific: <project>/.claude/skills/playwright-skill

Workflow

For localhost work, detect running servers before writing a URL:
```
node -e "require('$SKILL_DIR/lib/helpers').detectDevServers().then(s => console.log(JSON.stringify(s)))"
```
Use the only result automatically. Ask which URL to use when there are multiple results. Ask for a URL or offer to start a server when none exist.
Write reusable scripts to $TMP_DIR/playwright-test-*.js unless the user asks to save them in the project. Use PW_SCRIPT_DIR to preserve scripts.
Use a visible browser by default. Use headless: true only when requested or when the environment has no display.
Put the target URL in a constant or environment variable.
Run scripts with node "$SKILL_DIR/run.js" <script.js>.
Report actions, failures, and artifact paths. Do not claim success without checking the resulting page.

Setup

Run once:

cd "$SKILL_DIR" && npm run setup

This installs Playwright and Chromium. Use cd "$SKILL_DIR" && npm run install-all-browsers when Firefox or WebKit is required.

Minimal example

const os = require('node:os');
const path = require('node:path');
const { chromium } = require('playwright');

const targetUrl = process.env.TARGET_URL || 'http://localhost:3000';
const artifactDir = process.env.PW_ARTIFACT_DIR || os.tmpdir();

(async () => {
  const browser = await chromium.launch({ headless: false });
  try {
    const page = await browser.newPage();
    await page.goto(targetUrl);
    console.log('Page loaded:', await page.title());
    await page.screenshot({ path: path.join(artifactDir, 'page.png'), fullPage: true });
  } finally {
    await browser.close();
  }
})();

Run it:

node "$SKILL_DIR/run.js" "$TMP_DIR/playwright-test-page.js"

For short one-off tasks, use inline execution:

node "$SKILL_DIR/run.js" -e "const browser = await chromium.launch({headless: false}); try { const page = await browser.newPage(); await page.goto('https://example.com'); console.log(await page.title()); } finally { await browser.close(); }"

The -e process exits as soon as the snippet settles, so close the browser inside the snippet.

Current Playwright patterns

Prefer locators that describe what a user sees, in this order:

page.getByRole() with an accessible name
page.getByLabel() for form controls
page.getByText() for visible content
page.getByTestId() when the application provides a test contract

Actions auto-wait for actionability. Use web-first assertions or a locator's waitFor() instead of waitForSelector(), fixed sleeps, or networkidle.

await page.getByLabel('Email').fill('test@example.com');
await page.getByRole('button', { name: 'Sign in' }).click();
await page.waitForURL('**/dashboard');
await page.getByRole('heading', { name: 'Dashboard' }).waitFor();

Common tasks

Responsive checks

{
  const os = require('node:os');
  const path = require('node:path');

  const artifactDir = process.env.PW_ARTIFACT_DIR || os.tmpdir();
  const viewports = [
    { name: 'desktop', width: 1440, height: 900 },
    { name: 'mobile', width: 390, height: 844 },
  ];

  for (const viewport of viewports) {
    await page.setViewportSize(viewport);
    await page.goto(targetUrl);
    await page.screenshot({ path: path.join(artifactDir, `${viewport.name}.png`), fullPage: true });
  }
}

Login flow

Use test credentials supplied by the user. Never invent or expose real credentials. Verify both the navigation and a post-login element.

await page.goto(`${targetUrl}/login`);
await page.getByLabel('Email').fill(process.env.TEST_EMAIL);
await page.getByLabel('Password').fill(process.env.TEST_PASSWORD);
await page.getByRole('button', { name: /sign in|log in/i }).click();
await page.waitForURL('**/dashboard');
await page.getByRole('heading', { name: /dashboard/i }).waitFor();

Save scripts and artifacts

PW_SCRIPT_DIR=./playwright-tests node "$SKILL_DIR/run.js" "$TMP_DIR/playwright-test-login.js"
PW_ARTIFACT_DIR=./playwright-artifacts node "$SKILL_DIR/run.js" "$TMP_DIR/playwright-test-page.js"

PW_SCRIPT_DIR copies file-based scripts before execution and adds a timestamp when a filename already exists. PW_ARTIFACT_DIR controls helper screenshot output; the default is the operating system temporary directory.

Connect to an existing Chrome session

Start Chrome with remote debugging enabled, then connect with Playwright:

const browser = await chromium.connectOverCDP('http://127.0.0.1:9222');
const page = browser.contexts()[0].pages()[0];

This reuses cookies and extensions in that session. Do not use it for secrets unless the user explicitly asks; a connected browser has the user's access.

Helpers

const helpers = require(`${process.env.PW_SKILL_DIR}/lib/helpers`);

const servers = await helpers.detectDevServers();
const browser = await helpers.launchBrowser('chromium');
const context = await helpers.createContext(browser);
const page = await context.newPage();
await helpers.handleCookieBanner(page);
await helpers.takeScreenshot(page, 'result');

Available helpers are detectDevServers, getExtraHeadersFromEnv, launchBrowser, createContext, handleCookieBanner, and takeScreenshot. Use Playwright locators and assertions directly for actions, waits, extraction, authentication, tables, and retries.