# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [0.1.2] - 2025-01-24
### Added
- **Test Suite**: Comprehensive test coverage with Vitest (163 tests)
- Unit tests for all data loaders and tools
- Integration tests for MCP server functionality
- ~82% code coverage
- **Biome**: Fast linter and formatter for code quality
- ESLint + Prettier replacement
- Configured with TypeScript support
### Changed
- Code cleanup via Biome auto-fixes (unused imports, `node:` protocol, etc.)
## [0.2.0] - 2025-01-24
### Added
- **Zod Input Validation**: Type-safe validation for all tool inputs with structured error responses
- **Custom Error Classes**: `SpecNotFoundError`, `WebIDLNotFoundError`, `CSSNotFoundError`, `ElementsNotFoundError`, `ValidationError` with helpful suggestions
- **Debug Logging**: Environment-based logging controlled by `W3C_MCP_DEBUG=true`
- **Performance Logging**: Timing information for tool calls with `W3C_MCP_PERF=true`
- **CI/CD Pipeline**: GitHub Actions workflow for Node.js 18/20/22 with automatic npm publishing
### Changed
- Structured error responses with JSON format including error type, message, and suggestions
- Improved error messages for not-found scenarios
### Performance
- Promise-based singleton caching prevents duplicate data loads
- Map-based spec index for O(1) lookups (previously O(n))
- Parallel data preloading at server startup (~70ms total)
- Optimized search with pre-compiled regex and early termination
## [0.1.0] - 2025-01-24
### Added
- Initial release of W3C MCP Server
- **Specification Discovery Tools**
- `list_w3c_specs` - List W3C/WHATWG/IETF web specifications with filtering
- `get_w3c_spec` - Get detailed information about a specific specification
- `search_w3c_specs` - Search specifications by query
- **WebIDL Tools**
- `get_webidl` - Get WebIDL interface definitions for a specification
- `list_webidl_specs` - List all specs with WebIDL definitions
- **CSS Tools**
- `get_css_properties` - Get CSS property definitions
- `list_css_specs` - List all CSS specifications
- **HTML Elements Tools**
- `get_html_elements` - Get HTML element definitions
- `list_element_specs` - List all specs with element definitions
- **PWA Tools**
- `get_pwa_specs` - Get all PWA-related specifications
- `get_spec_dependencies` - Get specification dependency information
