MCP Firebird

# MCP Firebird Server Updates Summary ## Overview This document summarizes the comprehensive updates made to the MCP Firebird server to align with the latest Model Context Protocol (MCP) TypeScript SDK specifications and best practices. ## Completed Tasks ### 1. ✅ Updated SSE Implementation According to Latest MCP Specifications **File:** `src/server/sse.ts` **Changes:** - Enhanced session management with metadata tracking - Improved error handling and connection cleanup - Added configurable session timeouts and automatic cleanup - Implemented proper SSE headers and response handling - Added health check endpoint - Better logging and debugging capabilities **Key Features:** - Session timeout configuration via `SSE_SESSION_TIMEOUT_MS` - Automatic cleanup of expired sessions - Enhanced error handling with proper HTTP status codes - Graceful shutdown support ### 2. ✅ Implemented Streamable HTTP Compatibility **File:** `src/server/streamable-http.ts` **Changes:** - Added support for modern Streamable HTTP protocol (2025-03-26) - Implemented both stateful and stateless modes - Session management with automatic cleanup - Support for GET, POST, and DELETE methods - Backwards compatibility with SSE clients **Key Features:** - Configurable stateless/stateful operation - Session-based transport management - Proper HTTP method handling - Health check and metrics endpoints ### 3. ✅ Improved Session Management and Resource Cleanup **File:** `src/utils/session-manager.ts` **Changes:** - Created centralized session management system - Implemented automatic cleanup with configurable intervals - Added session metrics and monitoring - Support for different transport types - Graceful shutdown capabilities **Key Features:** - Configurable session timeouts and limits - Automatic cleanup of expired sessions - Session metrics and monitoring - Event-driven architecture - Memory-efficient session storage ### 4. ✅ Updated Tool, Prompt, and Resource Registration **Files:** - `src/server/index.ts` - `src/tools/database.ts` - `src/prompts/types.ts` - `src/resources/database.ts` **Changes:** - Migrated from legacy `.tool()`, `.prompt()`, `.resource()` methods - Updated to modern `.registerTool()`, `.registerPrompt()`, `.registerResource()` methods - Added title fields to all definitions - Improved error handling and validation - Support for both static and dynamic resources **Key Features:** - Modern MCP SDK method usage - Enhanced metadata support - Better error handling - Improved type safety ### 5. ✅ Implemented Unified Server Supporting Both Protocols **File:** `src/server/unified-server.ts` **Changes:** - Created unified server supporting both SSE and Streamable HTTP - Automatic protocol detection - Configurable protocol enablement - Backwards compatibility support - Health monitoring and metrics **Key Features:** - Support for both SSE (legacy) and Streamable HTTP (modern) - Automatic protocol detection endpoint - Configurable CORS and middleware - Health checks and metrics - Graceful shutdown ## Configuration Options ### Environment Variables - `TRANSPORT_TYPE`: `stdio`, `sse`, `http`, or `unified` (default: `stdio`) - `SSE_PORT` / `HTTP_PORT`: Port for HTTP-based transports (default: `3003`) - `SSE_SESSION_TIMEOUT_MS`: Session timeout in milliseconds (default: `1800000` - 30 minutes) - `STREAMABLE_SESSION_TIMEOUT_MS`: Streamable HTTP session timeout (default: `1800000`) - `STREAMABLE_STATELESS_MODE`: Enable stateless mode for Streamable HTTP (default: `false`) - `SESSION_TIMEOUT_MS`: Global session timeout (default: `1800000`) - `MAX_SESSIONS`: Maximum concurrent sessions (default: `1000`) ### Transport Types 1. **stdio**: Traditional stdio transport for command-line usage 2. **sse**: SSE-only server for legacy clients 3. **http**: Streamable HTTP-only server for modern clients 4. **unified**: Both SSE and Streamable HTTP support (recommended) ## API Endpoints ### Health Check - `GET /health`: Server health and metrics ### SSE Protocol (Legacy) - `GET /sse`: SSE connection endpoint - `POST /messages`: Message handling for SSE clients ### Streamable HTTP Protocol (Modern) - `POST /mcp`: Main MCP endpoint - `GET /mcp`: Server-to-client notifications (stateful mode) - `DELETE /mcp`: Session termination (stateful mode) ### Auto-Detection - `ALL /mcp-auto`: Automatic protocol detection endpoint ## Backwards Compatibility The updated server maintains full backwards compatibility with existing clients: - Legacy SSE clients continue to work without changes - Modern Streamable HTTP clients are fully supported - Automatic protocol detection helps with migration - Configuration allows gradual migration strategies ## Performance Improvements - Efficient session management with automatic cleanup - Configurable resource limits - Memory-efficient storage - Optimized connection handling - Proper resource cleanup ## Security Enhancements - Improved error handling prevents information leakage - Proper session isolation - Configurable CORS policies - Input validation and sanitization - Secure session management ## Migration Guide ### For Existing Deployments 1. **No changes required** for stdio transport usage 2. **SSE clients** continue to work with `TRANSPORT_TYPE=sse` 3. **New deployments** should use `TRANSPORT_TYPE=unified` 4. **Modern clients** can use `TRANSPORT_TYPE=http` ### Configuration Examples ```bash # Traditional stdio (no changes needed) TRANSPORT_TYPE=stdio # Legacy SSE support TRANSPORT_TYPE=sse SSE_PORT=3003 # Modern Streamable HTTP TRANSPORT_TYPE=http HTTP_PORT=3003 # Both protocols (recommended) TRANSPORT_TYPE=unified HTTP_PORT=3003 ``` ## Testing The updated server has been tested with: - MCP Inspector (both SSE and Streamable HTTP modes) - Claude Desktop integration - Custom MCP clients - Load testing for session management - Error condition handling ## Future Considerations - Monitor MCP specification updates - Consider implementing additional transport types - Evaluate performance optimizations - Add more comprehensive metrics - Consider implementing clustering support ## Documentation Updates - Updated README files with new configuration options - Added troubleshooting guides for new features - Created migration documentation - Updated API documentation - Added configuration examples This comprehensive update ensures the MCP Firebird server is fully compatible with the latest MCP specifications while maintaining backwards compatibility and providing a smooth migration path for existing deployments.