Cypress MCP Server

A Model Context Protocol (MCP) server implementation that integrates Cypress with Cursor AI, enabling AI-powered test automation, debugging, and script generation.

🚀 Features

• Full Cypress Integration: Supports all major Cypress commands and features
• MCP Standard Compliant: Follows the official Model Context Protocol specification
• Cursor AI Compatible: Seamlessly integrates with Cursor's AI assistant
• Comprehensive Tool Set:
  • Run tests in headless or headed mode
  • Validate test files and code
  • Generate tests from descriptions
  • Retrieve test results, screenshots, and videos
  • Execute Cypress commands programmatically
• Security: Configurable command allowlist and execution time limits
• Logging: Comprehensive logging with Winston
• Flexible Configuration: YAML-based configuration with environment variable support

📋 Prerequisites

• Node.js 18.0.0 or higher
• npm or yarn package manager
• Cypress project (existing or new)

🔧 Installation

Option 1: Install from npm (when published)

npm install -g cypress-mcp-server

Option 2: Install from source

git clone https://github.com/yourusername/cypress-mcp-server.git
cd cypress-mcp-server
npm install
npm link  # Optional: link globally for CLI access

⚙️ Configuration

1. Create Configuration File

Copy the example configuration file:

cp cypress-mcp.config.yaml.example cypress-mcp.config.yaml

2. Configure Cursor

Add the MCP server to Cursor's configuration. Open Cursor settings and add:

On macOS/Linux: ~/.cursor/mcp.json

On Windows: %APPDATA%\Cursor\mcp.json

{
  "mcpServers": {
    "cypress": {
      "command": "node",
      "args": ["/path/to/cypress-mcp-server/src/index.js"],
      "env": {
        "CYPRESS_MCP_CONFIG": "/path/to/cypress-mcp.config.yaml"
      }
    }
  }
}

Or if installed globally:

{
  "mcpServers": {
    "cypress": {
      "command": "cypress-mcp-server"
    }
  }
}

3. Customize Configuration

Edit cypress-mcp.config.yaml:

cypress:
  projectPath: /path/to/your/cypress/project
  browser: chrome
  headless: true
  baseUrl: http://localhost:3000
  viewportWidth: 1280
  viewportHeight: 720
  defaultCommandTimeout: 4000
  requestTimeout: 5000
  responseTimeout: 30000

mcp:
  name: cypress-mcp-server
  version: 1.0.0

security:
  allowedCommands:
    - '*'
  maxExecutionTime: 300000

🎯 Usage

Once configured, you can use natural language prompts in Cursor to interact with Cypress:

Running Tests

Run all Cypress tests in headless mode

Run the test file cypress/e2e/login.cy.js using Firefox

Run Cypress tests with baseUrl set to http://localhost:8080

Generating Tests

Generate a Cypress test that validates user login. The test should visit the login page, enter credentials, click login, and verify redirect to dashboard. Save it to cypress/e2e/login.cy.js

Validating Tests

Validate the Cypress test file cypress/e2e/checkout.cy.js for syntax errors

Getting Results

Show me the results from the last Cypress test run

Get all screenshots from failed tests

📚 Available Tools

The MCP server exposes the following tools:

cypress_run

Run Cypress tests with specified options.

Parameters:

• spec (string, optional): Specific test file or glob pattern
• browser (string, optional): Browser to use (chrome, firefox, edge, electron)
• headless (boolean, optional): Run in headless mode
• baseUrl (string, optional): Base URL for the application
• env (object, optional): Environment variables
• config (object, optional): Additional Cypress configuration

cypress_open

Open Cypress Test Runner in headed mode for interactive debugging.

Parameters:

• browser (string, optional): Browser to open
• project (string, optional): Path to Cypress project

cypress_validate

Validate a Cypress test file or test code.

Parameters:

• testFile (string, optional): Path to test file
• testCode (string, optional): Test code to validate

cypress_generate

Generate a Cypress test file from a description.

Parameters:

• description (string, required): Description of the test
• testName (string, optional): Name for the test
• outputPath (string, optional): Path to save the generated test

cypress_get_results

Get test results from previous runs.

Parameters:

• runId (string, optional): Specific run ID, or omit for all results

cypress_get_screenshots

Get screenshots captured during test runs.

Parameters:

• runId (string, optional): Filter by run ID
• testPath (string, optional): Filter by test path

cypress_get_videos

Get videos recorded during test runs.

Parameters:

• runId (string, optional): Filter by run ID

cypress_execute_command

Execute a Cypress command directly (placeholder for advanced use cases).

📖 Examples

See the examples/ directory for:

• Example Cypress test files
• Sample Cursor prompts
• Configuration examples

🧪 Testing

Run the test suite:

npm test

Run tests with coverage:

npm run test:coverage

🔒 Security

The MCP server includes several security features:

1. Command Allowlist: Configure which Cypress commands are allowed
2. Execution Time Limits: Prevent long-running tests from blocking
3. Input Validation: All inputs are validated before execution
4. Error Handling: Comprehensive error handling prevents crashes

📝 Logging

Logs are written to:

• Console (development mode)
• logs/error.log (errors only)
• logs/combined.log (all logs)

Set the log level with the LOG_LEVEL environment variable:

LOG_LEVEL=debug node src/index.js

🐛 Troubleshooting

Server won't start

1. Check Node.js version: node --version (should be 18+)
2. Verify dependencies: npm install
3. Check configuration file syntax
4. Review logs in logs/ directory

Tests not running

1. Verify Cypress is installed: npx cypress verify
2. Check project path in configuration
3. Ensure baseUrl is accessible
4. Check browser permissions

Cursor not connecting

1. Verify MCP configuration in Cursor settings
2. Check file paths are absolute
3. Restart Cursor after configuration changes
4. Check console for connection errors

Browser issues

1. Ensure Chrome/Firefox is installed
2. Check browser permissions
3. Try running Cypress manually: npx cypress open
4. Review Cypress documentation for browser setup

🤝 Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests
5. Submit a pull request

📄 License

MIT License - see LICENSE file for details

🔗 Links

• Model Context Protocol Documentation
• Cypress Documentation
• Cursor Documentation

🙏 Acknowledgments

• Anthropic for the Model Context Protocol specification
• The Cypress team for an amazing testing framework
• Cursor for AI-powered development tools

📧 Support

For issues, questions, or contributions:

• Open an issue on GitHub
• Check existing documentation
• Review example files

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Note: This is a community project and is not officially affiliated with Cypress, Cursor, or Anthropic.