# Changelog
All notable changes to the Market Sizing MCP Server 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).
## [Unreleased]
### Added
- **Default Values System**
- Added comprehensive default values to all required tool parameters
- Enabled zero-configuration tool testing with MCP Inspector
- Professional default parameters for immediate productivity
- Smart defaults for market analysis, industry research, and financial data
- Planned WebSocket support for real-time streaming
- GraphQL endpoint for complex queries
- Advanced market forecasting algorithms
- Integration with additional data providers
### Changed
- **Tool Parameter Defaults (BREAKING: Enhanced Usability)**
- All tools now accept empty or partial arguments with intelligent defaults
- Market analysis tools pre-configured with industry-standard parameters
- Financial data tools use representative symbols and time periods
- Geographic tools default to US market with major metropolitan areas
- **Code Quality Improvements**
- Reduced ESLint warnings from 10,000+ to 327 (97% reduction)
- Replaced console statements with structured Winston logging
- Fixed all ESLint errors (43 → 0) to ensure strict code quality compliance
- Applied Prettier formatting across all TypeScript files for consistent code style
- Improved nullish coalescing operators (`??`) usage for safer null handling
- Enhanced ESLint configuration to properly handle intentionally unused parameters
- Resolved floating promises with proper error handling patterns
- Applied TypeScript best practices for better type safety
- **Test Suite Enhancements**
- Updated all tests to support new default value system
- Fixed service constructor tests to accommodate logger usage
- Enhanced integration tests for default parameter validation
- All 245 tests now pass with improved coverage
- **Development Workflow**
- Cleaned up temporary files and test scripts per CONTRIBUTING.md
- Improved adherence to project organization standards
- Enhanced documentation structure and completeness
- Performance optimizations for large datasets
- Enhanced caching strategies
- **Architecture Documentation Updates**
- Added comprehensive notification system architecture section to `DESIGN-ARCHITECTURE.md`
- Updated `ARCHITECTURE-QUICK-REFERENCE.md` with notification system summary
- Documented 6 enhanced notification types with business value and integration patterns
- Included notification transport layer support and client integration guidelines
### Fixed
- **Tool Functionality**
- Fixed industry_analysis tool mapping in server.ts
- Resolved market_forecasting variable handling bug
- Enhanced error handling for missing required parameters
- **Code Quality**
- ESLint configuration for unused variables starting with underscore
- Object prototype method access patterns for better security
- All linting and formatting violations to meet contributing guidelines
- Console statement migration to proper logging infrastructure
## [1.0.0] - 2025-06-03
### Added
- **Core MCP Server Implementation**
- Complete HTTP Streamable transport with Server-Sent Events
- MCP 2024-11-05 protocol specification compliance
- Session management with secure cookie handling
- Comprehensive error handling and logging
- **Market Analysis Tools (10 Tools)**
- `industry_search` - Industry discovery and exploration
- `get_industry_data` - Detailed industry statistics
- `get_market_size` - Current market size calculations
- `calculate_tam` - Total Addressable Market analysis
- `calculate_sam` - Serviceable Addressable Market calculations
- `get_market_segments` - Market segmentation analysis
- `forecast_market` - Market forecasting and projections
- `compare_markets` - Multi-market comparison analysis
- `validate_market_data` - Data validation and verification
- `get_market_opportunities` - Opportunity identification
- **Performance & Monitoring**
- NodeCache-based caching system with TTL management
- Prometheus metrics collection and monitoring
- Winston structured logging with business metrics
- Request/response performance profiling
- Cache hit/miss ratio tracking
- **Security & Reliability**
- Express rate limiting with configurable windows
- CORS protection with flexible origin configuration
- Helmet security headers
- Input validation with Zod schemas
- Comprehensive error boundaries
- **Developer Experience**
- TypeScript with strict type checking
- ESLint and Prettier configuration
- Comprehensive JSDoc documentation
- Development and production build scripts
- Environment configuration management
- **API Endpoints**
- `GET /mcp/discovery` - Server capabilities discovery
- `POST /mcp/session` - Session creation and management
- `POST /mcp/tools/{tool_name}` - Tool execution endpoints
- `GET /mcp/events` - Server-Sent Events streaming
- `GET /mcp/health` - Health check and diagnostics
- `GET /mcp/metrics` - Prometheus metrics endpoint
- **Data Service Layer**
- Mock data implementations for all market analysis functions
- Extensible architecture for real data provider integration
- Support for multiple market data sources
- Data normalization and standardization
- **Caching Strategy**
- Tool-specific cache TTL configurations
- Automatic cache invalidation
- Memory usage optimization
- Cache statistics and monitoring
- **Configuration Management**
- Environment variable support for all settings
- Docker and container deployment ready
- Development and production configurations
- Secure API key management
### Technical Implementation
- **Architecture**: Modular TypeScript architecture with clear separation of concerns
- **Transport**: HTTP with Server-Sent Events for real-time streaming
- **Validation**: Runtime type validation with Zod schemas
- **Performance**: In-memory caching with configurable TTL
- **Monitoring**: Comprehensive metrics and structured logging
- **Security**: Multi-layer security with rate limiting and input validation
### Dependencies
#### Core Dependencies
- `express` ^4.18.2 - Web framework
- `zod` ^3.22.4 - Runtime type validation
- `winston` ^3.11.0 - Structured logging
- `node-cache` ^5.1.2 - In-memory caching
- `prom-client` ^15.1.0 - Prometheus metrics
#### Security Dependencies
- `helmet` ^7.1.0 - Security headers
- `cors` ^2.8.5 - CORS handling
- `express-rate-limit` ^7.1.5 - Rate limiting
- `express-validator` ^7.0.1 - Input validation
#### Utility Dependencies
- `axios` ^1.6.2 - HTTP client
- `uuid` ^9.0.1 - UUID generation
- `compression` ^1.7.4 - Response compression
#### Development Dependencies
- `typescript` ^5.0.0 - TypeScript compiler
- `tsx` ^4.6.0 - TypeScript execution
- `eslint` ^8.0.0 - Code linting
- `prettier` ^3.0.0 - Code formatting
- `vitest` ^1.0.0 - Testing framework
### Breaking Changes
- Initial release - no breaking changes
### Migration Guide
- Initial release - no migration needed
### Known Issues
- Mock data is used by default - configure API keys for real data
- Single-node deployment only - clustering support planned for v1.1.0
- In-memory cache only - Redis support planned for v1.1.0
### Performance Benchmarks
- **Tool Execution**: Average 150ms response time for cached requests
- **Cache Hit Ratio**: 85%+ for repeated queries within TTL window
- **Concurrent Requests**: Tested up to 100 concurrent requests
- **Memory Usage**: ~50MB baseline with 200MB cache limit
### Security Audit
- Input validation: ✅ All inputs validated with Zod schemas
- Rate limiting: ✅ Configurable per-IP limits
- CORS protection: ✅ Configurable origin restrictions
- Security headers: ✅ Helmet.js security headers applied
- Session security: ✅ Secure session management implemented
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## Version History Summary
| Version | Release Date | Major Features |
|---------|--------------|----------------|
| 1.0.0 | 2025-06-03 | Initial release with complete MCP server and 10 market analysis tools |
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## Upgrade Instructions
### From Development to v1.0.0
This is the initial release. Follow the installation instructions in README.md.
### Future Upgrades
Upgrade instructions will be provided here for future versions.
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## Support
For questions about specific versions or upgrade assistance:
- Check the [GitHub Issues](https://github.com/tam-mcp-server/market-sizing-mcp/issues)
- Review the [Contributing Guide](CONTRIBUTING.md)
- Contact support at support@tam-mcp-server.com
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*This changelog is automatically updated with each release. For the most current information, check the GitHub releases page.*
