## [2.9.0] - 2025-08-01
### Added
- **n8n Integration with MCP Client Tool Support**: Complete n8n integration enabling n8n-mcp to run as MCP server within n8n workflows
- Full compatibility with n8n's MCP Client Tool node
- Dedicated n8n mode (`N8N_MODE=true`) for optimized operation
- Workflow examples and n8n-friendly tool descriptions
- Quick deployment script (`deploy/quick-deploy-n8n.sh`) for easy setup
- Docker configuration specifically for n8n deployment (`Dockerfile.n8n`, `docker-compose.n8n.yml`)
- Test scripts for n8n integration (`test-n8n-integration.sh`, `test-n8n-mode.sh`)
- **n8n Deployment Documentation**: Comprehensive guide for deploying n8n-MCP with n8n (`docs/N8N_DEPLOYMENT.md`)
- Local testing instructions using `/scripts/test-n8n-mode.sh`
- Production deployment with Docker Compose
- Cloud deployment guide for Hetzner, AWS, and other providers
- n8n MCP Client Tool setup and configuration
- Troubleshooting section with common issues and solutions
- **Protocol Version Negotiation**: Intelligent client detection for n8n compatibility
- Automatically detects n8n clients and uses protocol version 2024-11-05
- Standard MCP clients get the latest version (2025-03-26)
- Improves compatibility with n8n's MCP Client Tool node
- Comprehensive protocol negotiation test suite
- **Comprehensive Parameter Validation**: Enhanced validation for all MCP tools
- Clear, user-friendly error messages for invalid parameters
- Numeric parameter conversion and edge case handling
- 52 new parameter validation tests
- Consistent error format across all tools
- **Session Management**: Improved session handling with comprehensive test coverage
- Fixed memory leak potential with async cleanup
- Better connection close handling
- Enhanced session management tests
- **Dynamic README Version Badge**: Made version badge update automatically from package.json
- Added `update-readme-version.js` script
- Enhanced `sync-runtime-version.js` to update README badges
- Version badge now stays in sync during publish workflow
### Fixed
- **Docker Build Optimization**: Fixed Dockerfile.n8n using wrong dependencies
- Now uses `package.runtime.json` instead of full `package.json`
- Reduces build time from 13+ minutes to 1-2 minutes
- Fixes ARM64 build failures due to network timeouts
- Reduces image size from ~1.5GB to ~280MB
- **CI Test Failures**: Resolved Docker entrypoint permission issues
- Updated tests to accept dynamic UID range (10000-59999)
- Enhanced lock file creation with better error recovery
- Fixed TypeScript lint errors in test files
- Fixed flaky performance tests with deterministic versions
- **Schema Validation Issues**: Fixed n8n nested output format compatibility
- Added validation for n8n's nested output workaround
- Fixed schema validation errors with n8n MCP Client Tool
- Enhanced error sanitization for production environments
### Changed
- **Memory Management**: Improved session cleanup to prevent memory leaks
- **Error Handling**: Enhanced error sanitization for production environments
- **Docker Security**: Using unpredictable UIDs/GIDs (10000-59999 range) for better security
- **CI/CD Configuration**: Made codecov patch coverage informational to prevent CI failures on infrastructure code
- **Test Scripts**: Enhanced with Docker auto-installation and better user experience
- Added colored output and progress indicators
- Automatic Docker installation for multiple operating systems
- n8n API key flow for management tools
### Security
- **Enhanced Docker Security**: Dynamic UID/GID generation for containers
- **Error Sanitization**: Improved error messages to prevent information leakage
- **Permission Handling**: Better permission management for mounted volumes
- **Input Validation**: Comprehensive parameter validation prevents injection attacks
