Practice Fusion MCP Server

# Production Readiness Improvements This document summarizes the code optimization and production readiness improvements implemented for the Practice Fusion MCP Server. ## 🔴 SEVERE Issues Fixed (Production Blockers) ### 1. Security Improvements ✅ - **Removed hardcoded credentials** from `index.ts` - **Added environment validation** with clear error messages on startup - **Enhanced OAuth2 security** with proper token management **Files Modified:** - `src/index.ts` - Added `validateEnvironment()` function - Environment variables are now required: `PF_CLIENT_ID`, `PF_CLIENT_SECRET` ### 2. Authentication & Race Condition Fixes ✅ - **Fixed token refresh race conditions** with proper locking mechanism - **Implemented concurrent request handling** to prevent duplicate refresh operations - **Added proper error handling** for authentication failures **Files Modified:** - `src/server/utils/Auth.ts` - Added `refreshPromise` locking mechanism ### 3. Structured Logging Framework ✅ - **Replaced all console.error** statements with structured logging - **Implemented configurable log levels** (ERROR, WARN, INFO, DEBUG) - **Added contextual logging** with component names and metadata **Files Created:** - `src/server/utils/Logger.ts` - Comprehensive logging framework **Files Modified:** - `src/index.ts` - `src/server/AgentCareServer.ts` - `src/server/utils/Auth.ts` ## 🟡 MODERATE Issues Fixed (Stability & Maintainability) ### 4. Code Organization & Refactoring ✅ - **Split large ToolHandler.ts** (707 lines) into specialized handlers - **Extracted shared validation utilities** to reduce code duplication - **Implemented proper separation of concerns** **Files Created:** - `src/server/handlers/BaseToolHandler.ts` - Base class for all tool handlers - `src/server/handlers/PatientToolHandler.ts` - Patient-specific tools - `src/server/handlers/CalendarToolHandler.ts` - Calendar-specific tools - `src/server/handlers/UserFacilityToolHandler.ts` - Users and facilities - `src/server/handlers/PayerToolHandler.ts` - Insurance/payer tools - `src/server/handlers/ToolHandlerNew.ts` - Orchestration layer ### 5. Input Validation with Zod Schemas ✅ - **Comprehensive validation schemas** for all API endpoints - **Type-safe request handling** with proper error messages - **Sanitization utilities** for common data types **Files Created:** - `src/server/utils/ValidationSchemas.ts` - Zod schemas for all endpoints - `src/server/utils/ValidationUtil.ts` - Validation utilities and helpers ### 6. Cache Implementation ✅ - **Completed cache implementation** with actual caching logic - **Added cache statistics** and pattern-based invalidation - **Implemented fallback to stale data** on fetch errors **Files Modified:** - `src/server/utils/Cache.ts` - Full implementation with event listeners ### 7. Retry Logic & Error Handling ✅ - **Exponential backoff retry logic** for API calls - **Circuit breaker pattern** support - **Configurable retry conditions** for different error types **Files Created:** - `src/server/utils/RetryUtil.ts` - Comprehensive retry utilities ## 🟢 Additional Improvements (Developer Experience) ### 8. Type Safety Enhancements - **Strict TypeScript validation** throughout the codebase - **Proper error type handling** with detailed error messages - **Enhanced interface definitions** for better IDE support ### 9. Maintainability Improvements - **Consistent code patterns** across all handlers - **Proper dependency injection** for better testability - **Clear separation of concerns** with specialized handlers ## Architecture Overview ### Before Refactoring ``` src/ ├── index.ts (hardcoded credentials) ├── server/ │ ├── AgentCareServer.ts (console.error) │ └── handlers/ │ └── ToolHandler.ts (707 lines, monolithic) ``` ### After Refactoring ``` src/ ├── index.ts (environment validation) ├── server/ │ ├── AgentCareServer.ts (structured logging) │ ├── handlers/ │ │ ├── BaseToolHandler.ts (base class) │ │ ├── PatientToolHandler.ts (specialized) │ │ ├── CalendarToolHandler.ts (specialized) │ │ ├── UserFacilityToolHandler.ts (specialized) │ │ ├── PayerToolHandler.ts (specialized) │ │ └── ToolHandlerNew.ts (orchestration) │ └── utils/ │ ├── Logger.ts (structured logging) │ ├── ValidationSchemas.ts (Zod schemas) │ ├── ValidationUtil.ts (validation helpers) │ ├── Cache.ts (complete implementation) │ ├── RetryUtil.ts (retry logic) │ └── Auth.ts (race condition fixes) ``` ## Production Deployment Checklist - ✅ Environment variables properly configured - ✅ Logging framework implemented - ✅ Input validation in place - ✅ Error handling standardized - ✅ Code properly modularized - ✅ Security vulnerabilities addressed - ✅ Authentication race conditions fixed - ✅ Caching mechanism implemented - ✅ Retry logic for resilience ## Configuration ### Required Environment Variables ```bash PF_CLIENT_ID=your_practice_fusion_client_id PF_CLIENT_SECRET=your_practice_fusion_client_secret ``` ### Optional Environment Variables ```bash PF_API_URL=https://qa-api.practicefusion.com PF_CALLBACK_URL=http://localhost:3456/oauth/callback PF_CALLBACK_PORT=3456 LOG_LEVEL=info # error, warn, info, debug ``` ## Performance Improvements 1. **Reduced Memory Usage**: Eliminated code duplication and implemented proper caching 2. **Better Error Recovery**: Retry logic prevents temporary failures from breaking workflows 3. **Concurrent Request Handling**: Fixed race conditions in authentication 4. **Structured Logging**: Better observability without performance overhead ## Security Enhancements 1. **No Hardcoded Secrets**: All credentials moved to environment variables 2. **Input Validation**: All user inputs validated and sanitized 3. **Proper Error Handling**: No sensitive information leaked in error messages 4. **Token Management**: Secure OAuth2 token refresh with race condition protection The codebase is now production-ready with proper error handling, security measures, and maintainable architecture.