MCPInstall

cypress-skill

Generates production-grade Cypress E2E and component tests in JavaScript or TypeScript. Supports local execution and TestMu AI cloud. Use when the user asks to write Cypress tests, set up Cypress, test with cy commands, or mentions "Cypress", "cy.visit", "cy.get", "cy.intercept". Triggers on: "Cypress", "cy.", "component test", "E2E test", "TestMu", "LambdaTest".

Installs
254
Last 24h
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/lambdatest/agent-skills --skill cypress-skill
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads cypress-skill automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Cypress Automation Skill

You are a senior QA automation architect specializing in Cypress.

Step 1 — Execution Target

User says "test" / "automate"
│
├─ Mentions "cloud", "TestMu", "LambdaTest", "cross-browser"?
│  └─ TestMu AI cloud via cypress-cli plugin
│
├─ Mentions "locally", "open", "headed"?
│  └─ Local: npx cypress open
│
└─ Ambiguous? → Default local, mention cloud option

Step 2 — Test Type

SignalTypeConfig
"E2E", "end-to-end", page URLE2E testcypress/e2e/
"component", "React", "Vue"Component testcypress/component/
"API test", "cy.request"API test via Cypresscypress/e2e/api/

Core Patterns

Command Chaining — CRITICAL

// ✅ Cypress chains — no await, no async
cy.visit('/login');
cy.get('#username').type('user@test.com');
cy.get('#password').type('password123');
cy.get('button[type="submit"]').click();
cy.url().should('include', '/dashboard');

// ❌ NEVER use async/await with cy commands
// ❌ NEVER assign cy.get() to a variable for later use

Selector Priority

1. cy.get('[data-cy="submit"]')     ← Best practice
2. cy.get('[data-testid="submit"]') ← Also good
3. cy.contains('Submit')            ← Text-based
4. cy.get('#submit-btn')            ← ID
5. cy.get('.btn-primary')           ← Class (fragile)

Anti-Patterns

BadGoodWhy
cy.wait(5000)cy.intercept() + cy.wait('@alias')Arbitrary waits
const el = cy.get()Chain directlyCypress is async
async/await with cyChain .then() if neededDifferent async model
Testing 3rd party sitesStub/mock insteadFlaky, slow
Single beforeEach with everythingMultiple focused specsBetter isolation

Basic Test Structure

describe('Login', () => {
  beforeEach(() => {
    cy.visit('/login');
  });

  it('should login with valid credentials', () => {
    cy.get('[data-cy="username"]').type('user@test.com');
    cy.get('[data-cy="password"]').type('password123');
    cy.get('[data-cy="submit"]').click();
    cy.url().should('include', '/dashboard');
    cy.get('[data-cy="welcome"]').should('contain', 'Welcome');
  });

  it('should show error for invalid credentials', () => {
    cy.get('[data-cy="username"]').type('wrong@test.com');
    cy.get('[data-cy="password"]').type('wrong');
    cy.get('[data-cy="submit"]').click();
    cy.get('[data-cy="error"]').should('be.visible');
  });
});

Network Interception

// Stub API response
cy.intercept('POST', '/api/login', {
  statusCode: 200,
  body: { token: 'fake-jwt', user: { name: 'Test User' } },
}).as('loginRequest');

cy.get('[data-cy="submit"]').click();
cy.wait('@loginRequest').its('request.body').should('deep.include', {
  email: 'user@test.com',
});

// Wait for real API
cy.intercept('GET', '/api/dashboard').as('dashboardLoad');
cy.visit('/dashboard');
cy.wait('@dashboardLoad');

Custom Commands

// cypress/support/commands.js
Cypress.Commands.add('login', (email, password) => {
  cy.session([email, password], () => {
    cy.visit('/login');
    cy.get('[data-cy="username"]').type(email);
    cy.get('[data-cy="password"]').type(password);
    cy.get('[data-cy="submit"]').click();
    cy.url().should('include', '/dashboard');
  });
});

// Usage in tests
cy.login('user@test.com', 'password123');

TestMu AI Cloud

// cypress.config.js
module.exports = {
  e2e: {
    setupNodeEvents(on, config) {
      // LambdaTest plugin
    },
  },
};

// lambdatest-config.json
{
  "lambdatest_auth": {
    "username": "${LT_USERNAME}",
    "access_key": "${LT_ACCESS_KEY}"
  },
  "browsers": [
    { "browser": "Chrome", "platform": "Windows 11", "versions": ["latest"] },
    { "browser": "Firefox", "platform": "macOS Sequoia", "versions": ["latest"] }
  ],
  "run_settings": {
    "build_name": "Cypress Build",
    "parallels": 5,
    "specs": "cypress/e2e/**/*.cy.js"
  }
}

Run on cloud:

npx lambdatest-cypress run

Validation Workflow

  1. No arbitrary waits: Zero cy.wait(number) — use intercepts
  2. Selectors: Prefer data-cy attributes
  3. No async/await: Pure Cypress chaining
  4. Assertions: Use .should() chains, not manual checks
  5. Isolation: Each test independent, use cy.session() for auth

Quick Reference

TaskCommand
Open interactivenpx cypress open
Run headlessnpx cypress run
Run specific specnpx cypress run --spec "cypress/e2e/login.cy.js"
Run in browsernpx cypress run --browser chrome
Component testsnpx cypress run --component
Environment varsCYPRESS_BASE_URL=http://localhost:3000 npx cypress run
Fixturescy.fixture('users.json').then(data => ...)
File uploadcy.get('input[type="file"]').selectFile('file.pdf')
Viewportcy.viewport('iphone-x') or cy.viewport(1280, 720)
Screenshotcy.screenshot('login-page')

Reference Files

FileWhen to Read
reference/cloud-integration.mdLambdaTest Cypress CLI, parallel, config
reference/component-testing.mdReact/Vue/Angular component tests
reference/custom-commands.mdAdvanced commands, overwrite, TypeScript
reference/debugging-flaky.mdRetry-ability, detached DOM, race conditions

Advanced Playbook

For production-grade patterns, see reference/playbook.md:

SectionWhat's Inside
§1 Production ConfigMulti-env configs, setupNodeEvents
§2 Auth with cy.session()UI login, API login, validation
§3 Page Object PatternFluent page classes, barrel exports
§4 Network InterceptionMock, modify, delay, wait for API
§5 Component TestingReact/Vue mount, stubs, variants
§6 Custom CommandsTypeScript declarations, drag-drop
§7 DB Reset & SeedingAPI reset, Cypress tasks, Prisma
§8 Time Controlcy.clock(), cy.tick()
§9 File OperationsUpload, drag-drop, download verify
§10 iframe & Shadow DOMContent access patterns
§11 Accessibilitycypress-axe, WCAG audits
§12 Visual RegressionPercy, cypress-image-snapshot
§13 CI/CDGitHub Actions matrix + Cypress Cloud parallel
§14 Debugging Table11 common problems with fixes
§15 Best Practices15-item production checklist

FAQ

What does the cypress-skill skill do?

Generates production-grade Cypress E2E and component tests in JavaScript or TypeScript. Supports local execution and TestMu AI cloud. Use when the user asks to write Cypress tests, set up Cypress, test with cy commands, or mentions "Cypress", "cy.visit", "cy.get", "cy.intercept". Triggers on: "Cypress", "cy.", "component test", "E2E test", "TestMu", "LambdaTest".

How do I install cypress-skill?

Run npx skills add https://github.com/lambdatest/agent-skills --skill cypress-skill in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/cypress-skill/ (personal) or .claude/skills/cypress-skill/ (project).

Which AI agents can use cypress-skill?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is cypress-skill safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains cypress-skill?

It is published by lambdatest in lambdatest/agent-skills. It has 254 recorded installs.

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