homeassistant-mcp/docs/development

Development Guide

This guide provides information for developers who want to contribute to or extend the Home Assistant MCP.

Project Structure

homeassistant-mcp/
├── src/
│   ├── __tests__/        # Test files
│   ├── __mocks__/       # Mock files
│   ├── api/           # API endpoints and route handlers
│   ├── config/        # Configuration management
│   ├── hass/         # Home Assistant integration
│   ├── interfaces/    # TypeScript interfaces
│   ├── mcp/          # MCP core functionality
│   ├── middleware/    # Express middleware
│   ├── routes/       # Route definitions
│   ├── security/     # Security utilities
│   ├── sse/          # Server-Sent Events handling
│   ├── tools/        # Tool implementations
│   ├── types/        # TypeScript type definitions
│   └── utils/        # Utility functions
├── __tests__/        # Test files
├── docs/            # Documentation
├── dist/           # Compiled JavaScript
└── scripts/        # Build and utility scripts

Development Setup

1. Install dependencies:

   npm install
   

2. Set up development environment:

   cp .env.example .env.development
   

3. Start development server:

   npm run dev
   

Code Style

We follow these coding standards:

1. TypeScript best practices

   • Use strict type checking
   • Avoid any types
   • Document complex types

2. ESLint rules

   • Run npm run lint to check
   • Run npm run lint:fix to auto-fix

3. Code formatting

   • Use Prettier
   • Run npm run format to format code

Testing

1. Unit tests:

   npm run test
   

2. Integration tests:

   npm run test:integration
   

3. Coverage report:

   npm run test:coverage
   

Creating New Tools

1. Create a new file in src/tools/:

   import { z } from 'zod';
   import { Tool } from '../types';
   
   export const myTool: Tool = {
     name: 'my_tool',
     description: 'Description of my tool',
     parameters: z.object({
       // Define parameters
     }),
     execute: async (params) => {
       // Implement tool logic
     }
   };
   

2. Add to src/tools/index.ts

3. Create tests in __tests__/tools/

4. Add documentation in docs/tools/

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Write/update tests
5. Update documentation
6. Submit a pull request

Pull Request Process

1. Ensure all tests pass
2. Update documentation
3. Update CHANGELOG.md
4. Get review from maintainers

Building

1. Development build:

   npm run build:dev
   

2. Production build:

   npm run build
   

Documentation

1. Update documentation for changes
2. Follow documentation structure
3. Include examples
4. Update type definitions

Debugging

1. Development debugging:

   npm run dev:debug
   

2. Test debugging:

   npm run test:debug
   

3. VSCode launch configurations provided

Performance

1. Follow performance best practices
2. Use caching where appropriate
3. Implement rate limiting
4. Monitor memory usage

Security

1. Follow security best practices
2. Validate all inputs
3. Use proper authentication
4. Handle errors securely

Deployment

1. Build for production:

   npm run build
   

2. Start production server:

   npm start
   

3. Docker deployment:

   docker-compose up -d
   

Support

Need development help?

1. Check documentation
2. Search issues
3. Create new issue
4. Join discussions