How to Use Cypress Skill With Claude Code [2026]

What Is a Cypress Skill

A Cypress Skill is a SKILL.md file that loads Cypress-specific rules into Claude Code to enforce stable selectors, intercept-based waits, and custom command structure in every test it generates.

The skill follows the open Agent Skills Standard. One SKILL.md file works across Claude Code, Cursor AI, GitHub Copilot, Gemini CLI, and 16+ other tools as of 2026. It is task-scoped, not general-purpose — Claude Code loads it only when you ask it to write or fix a Cypress test.

Cypress Skill Repository

The cypress-skill is one of 46 skills in the TestMu AI agent-skills repository alongside Playwright, Selenium, Appium, and WebdriverIO.

The repository ships a compact SKILL.md entry point and a reference folder with implementation guides for selectors, custom commands, fixtures, and cloud execution. Here is the folder layout:

cypress-skill/
├── SKILL.md                    # Entry point — selector rules, intercept patterns, command conventions
└── reference/
    ├── playbook.md             # Full setup guide, custom commands, fixture patterns, CI configs
    ├── advanced-patterns.md    # Shadow DOM, iframes, multi-tab flows, retry strategies
    └── cloud-integration.md    # TestMu AI Cypress CLI setup, capabilities, tunnel config

Claude Code reads SKILL.md first. It stays compact so it does not bloat the context window. When the agent needs deeper guidance on Cypress intercepts or cloud configuration, it pulls from the reference files on demand.

How to Run Tests Using Cypress Skill in Claude Code

Clone the TestMu AI agent-skills repository into your project's .claude/skills/ directory. Claude Code detects the skill automatically on the next session start with no extra configuration.

git clone https://github.com/LambdaTest/agent-skills.git .claude/skills/agent-skills

Open Claude Code inside your project directory and enter a prompt with the test target:

Write Cypress tests for the Simple Form Demo on the TestMu AI Selenium Playground at https://www.testmuai.com/selenium-playground/

Claude Code reads the Cypress Skill and generates the full suite: a spec file, custom commands extracted into commands.js, and cypress.config.js. The skill instructs the agent to put reusable actions into Cypress custom commands rather than duplicating them across specs.

Next, set your TestMu AI credentials. Find them at the bottom of the TestMu AI dashboard under Credentials:

# macOS/Linux
export LT_USERNAME="YOUR_TESTMUAI_USERNAME"
export LT_ACCESS_KEY="YOUR_TESTMUAI_ACCESS_KEY"

# Windows (PowerShell)
$env:LT_USERNAME="YOUR_TESTMUAI_USERNAME"
$env:LT_ACCESS_KEY="YOUR_TESTMUAI_ACCESS_KEY"

# Windows (Command Prompt)
set LT_USERNAME="YOUR_TESTMUAI_USERNAME"
set LT_ACCESS_KEY="YOUR_TESTMUAI_ACCESS_KEY"

Then prompt Claude Code to run on the TestMu AI Cypress testing cloud:

Run the same Cypress tests on the TestMu AI cloud grid on Chrome, Firefox, and Edge with Windows 11.

Claude Code reads reference/cloud-integration.md from the skill and updates the project. It generates lambdatest-config.json with browser capabilities and parallel settings, updates cypress.config.js with the TestMu AI base URL, and adds the lambdatest-cypress-cli package to package.json.

npx lambdatest-cypress-cli run

The CLI uploads your suite and triggers parallel execution across all configured browsers. Open the TestMu AI Automation Dashboard to see pass/fail status per browser, execution time, video recordings, and command logs for each session.

A test fails on Edge but passes on Chrome? Open the Edge session video. No local reproduction needed. For the full setup reference, see the guide on running Cypress tests using Agent Skills.

Conclusion

The Cypress Skill gives Claude Code the conventions it needs to write tests that hold up. Stable data-cy selectors, cy.intercept() for network control, cy.session() for auth reuse, and custom commands for shared logic — all enforced automatically on every test it generates.

Clone the skill into .claude/skills/, set your TestMu AI credentials, and prompt Claude Code with a test target. The output runs directly on the TestMu AI cloud grid across every browser you configure.

The TestMu AI agent-skills repository ships the Cypress Skill alongside 45 others covering Playwright, Selenium, Appium, and more. Install the skill for your framework and prompt Claude Code like a senior QA engineer who already knows your codebase.