EuConquisto Composer MCP

--- document: Task Specification - Comprehensive Error Handling and Resilience System version: 1.0.0 status: active author: Claude Code created: 2025-06-28 last_updated: 2025-06-28 --- # TASK-005: Comprehensive Error Handling and Resilience System ## 📋 Task Overview **Task ID**: TASK-005 **Title**: Comprehensive Error Handling and Resilience System **Status**: pending **Owner**: Claude Desktop **Priority**: medium **Dependencies**: TASK-002 (hybrid fallback system) **Created**: 2025-06-28 13:52 EST **Updated**: 2025-06-28 13:52 EST ## 🎯 Objective Implement a comprehensive error handling and resilience system that provides robust error recovery, detailed logging, user-friendly error messages, and system reliability across all components of the EuConquisto Composer MCP server. ## 📊 Current Context ### Current Error Handling State - ✅ Basic try-catch blocks in API client - ✅ HTTP status code handling - ⚠️ Limited error classification - ⚠️ Generic error messages - ❌ No retry mechanisms for transient failures - ❌ No error aggregation or analytics - ❌ Limited logging infrastructure ### Identified Error Categories ``` Error Classification: ├── API Errors │ ├── 500 Internal Server Error (current blocker) │ ├── Authentication failures │ ├── Network timeouts │ └── Rate limiting ├── Browser Automation Errors │ ├── Element not found │ ├── Timeout errors │ ├── Navigation failures │ └── EROFS/permission issues ├── Content Processing Errors │ ├── Invalid widget data │ ├── Malformed composition structure │ ├── NLP processing failures │ └── Validation errors ├── System Errors │ ├── Memory limitations │ ├── File system access │ ├── Configuration issues │ └── Dependency failures └── User Input Errors ├── Invalid parameters ├── Missing required fields ├── Format validation failures └── Permission violations ``` ## 🏗️ 4-Phase Execution Plan ### Phase 1: Understand Scope, Plan Implementation, Define Deliverables #### Scope Analysis ``` Comprehensive Error Handling System: ├── Error Classification Engine │ ├── Error type categorization │ ├── Severity level assignment │ └── Recovery strategy mapping ├── Resilience Framework │ ├── Retry mechanisms with exponential backoff │ ├── Circuit breaker patterns │ ├── Timeout management │ └── Graceful degradation ├── Logging and Monitoring │ ├── Structured logging system │ ├── Error aggregation and analytics │ ├── Performance monitoring │ └── Health check integration ├── User Experience Enhancement │ ├── User-friendly error messages │ ├── Localized error text (pt_br/en) │ ├── Recovery suggestions │ └── Progress indication during retries ├── Developer Tools │ ├── Error debugging utilities │ ├── Error simulation for testing │ ├── Performance profiling │ └── Error reporting integration └── Recovery Strategies ├── Automatic retry policies ├── Fallback mechanism activation ├── Data recovery procedures └── Service degradation handling ``` #### Implementation Plan ``` 1. Error Classification System - Comprehensive error taxonomy - Error type detection algorithms - Severity assessment engine - Recovery strategy mapping 2. Resilience Framework - Retry mechanism implementation - Circuit breaker patterns - Timeout management system - Graceful degradation policies 3. Logging Infrastructure - Structured logging implementation - Error aggregation system - Performance monitoring - Analytics and reporting 4. User Experience Enhancement - User-friendly error messages - Localization support - Recovery guidance system - Progress indication 5. Developer Tools - Debugging utilities - Error simulation framework - Performance profiling tools - Integration testing support ``` #### Deliverables ``` Primary Artifacts: ├── /src/errors/ │ ├── error-classifier.ts │ ├── error-handler.ts │ ├── resilience-framework.ts │ ├── retry-manager.ts │ ├── circuit-breaker.ts │ └── recovery-strategies.ts ├── /src/logging/ │ ├── structured-logger.ts │ ├── error-aggregator.ts │ ├── performance-monitor.ts │ └── analytics-collector.ts ├── /src/errors/messages/ │ ├── error-messages-en.json │ ├── error-messages-pt-br.json │ └── recovery-suggestions.json ├── /src/utils/ │ ├── error-simulator.ts │ ├── debugging-tools.ts │ └── performance-profiler.ts └── /tests/error-handling/ ├── error-classification.test.js ├── resilience-framework.test.js ├── retry-mechanisms.test.js ├── circuit-breaker.test.js └── error-recovery.test.js Configuration: ├── /config/error-handling/ │ ├── error-policies.json │ ├── retry-configurations.json │ ├── circuit-breaker-settings.json │ └── logging-configuration.json Documentation: ├── /docs/guides/error-handling.md ├── /docs/api/error-api.md ├── /docs/troubleshooting/common-errors.md └── /docs/examples/error-scenarios.md ``` **STOP AND WAIT** - Do not proceed to implementation **DO NOT** update knowledge graph **PAUSE** for explicit next-phase instructions ### Phase 2: Implementation #### Step 1: Create Artifacts ``` Implementation Order: 1. Error Classification Engine (/src/errors/error-classifier.ts) - Comprehensive error taxonomy - Automatic error categorization - Severity level assignment - Recovery strategy mapping 2. Resilience Framework (/src/errors/resilience-framework.ts) - Retry mechanism with exponential backoff - Circuit breaker implementation - Timeout management - Graceful degradation policies 3. Structured Logging System (/src/logging/structured-logger.ts) - Hierarchical logging levels - Contextual information capture - Performance metrics integration - Error correlation tracking 4. Error Handler (/src/errors/error-handler.ts) - Centralized error processing - Error transformation and enrichment - Recovery strategy execution - User notification management 5. Retry Manager (/src/errors/retry-manager.ts) - Intelligent retry policies - Exponential backoff algorithms - Retry limit management - Success rate tracking 6. Circuit Breaker (/src/errors/circuit-breaker.ts) - Failure threshold monitoring - Automatic service isolation - Recovery detection - Fallback activation 7. Error Aggregation (/src/logging/error-aggregator.ts) - Error pattern detection - Frequency analysis - Trending identification - Alert generation 8. User Experience Components - Localized error messages (pt_br/en) - Recovery suggestion engine - Progress indication system - Help and guidance integration 9. Developer Tools - Error simulation framework - Debugging utilities - Performance profiling tools - Testing integration ``` #### Step 2: Validate ``` Testing Protocol: 1. Error Classification Testing - All error types properly categorized - Severity levels correctly assigned - Recovery strategies appropriately mapped - Edge cases handled 2. Resilience Framework Testing - Retry mechanisms function correctly - Circuit breakers activate/deactivate properly - Timeout handling works as expected - Graceful degradation operates smoothly 3. Logging System Testing - All events properly logged - Performance metrics captured - Error correlation tracking functional - Log rotation and cleanup working 4. User Experience Testing - Error messages user-friendly and helpful - Localization working for pt_br and en - Recovery suggestions appropriate - Progress indication clear 5. Integration Testing - Error handling integrated across all components - API client error handling enhanced - Browser automation error recovery - MCP server stability improved 6. Performance Testing - Error handling overhead minimal - Logging performance acceptable - Recovery time within limits - System stability under error conditions ``` **STOP AND WAIT** - Do not proceed to Phase 3 **DO NOT** update knowledge graph **PAUSE** for explicit next-phase instructions ### Phase 3: Documentation #### Step 1: Knowledge Graph Updates ``` Entities to Create: ├── Error Handling System Entity ├── Error Classifier Entity ├── Resilience Framework Entity ├── Retry Manager Entity ├── Circuit Breaker Entity ├── Logging System Entity └── Error Recovery Entity Relations to Establish: ├── Error Handler → Uses → Error Classifier ├── Error Handler → Uses → Resilience Framework ├── Resilience Framework → Uses → Retry Manager ├── Resilience Framework → Uses → Circuit Breaker ├── Error Handler → Logs To → Logging System └── Error Handler → Executes → Error Recovery ``` #### Step 2: Progress Tracking ``` Documentation Updates: ├── /docs/progress/2025-06-28.md (update completion) ├── /docs/architecture/error-handling.md (new) ├── /docs/guides/error-handling.md (comprehensive guide) ├── /docs/troubleshooting/common-errors.md (troubleshooting) └── /docs/api/error-api.md (API documentation) Status Updates: ├── Mark TASK-005 as COMPLETED ├── Document created files ├── Update error handling capabilities └── Synchronize all documentation ``` **STOP AND WAIT** - Do not proceed to Phase 4 **DO NOT** update knowledge graph **PAUSE** for explicit next-phase instructions ### Phase 4: Thorough Verification #### Validation Protocol ``` 1. Implementation Completeness Check ├── Verify all error handling components ├── Check resilience mechanisms functional └── Validate logging system operational 2. System Validation ├── Test error handling across all components ├── Validate recovery mechanisms └── Confirm system stability improvements 3. Performance Validation ├── Error handling overhead measurement ├── Recovery time benchmarks └── System reliability metrics 4. Documentation Validation ├── Troubleshooting guide accuracy ├── API documentation completeness └── Error scenario examples validation ``` #### Verification Checklist ``` Per Component Verification: □ Error Classifier - categorization accurate □ Resilience Framework - retry/circuit breaker functional □ Structured Logger - comprehensive logging □ Error Handler - centralized processing □ Retry Manager - intelligent retry policies □ Circuit Breaker - failure isolation working □ Error Aggregator - pattern detection □ User Messages - localized and helpful □ Developer Tools - debugging utilities functional □ Performance Impact - within acceptable limits □ Documentation - complete and accurate ``` ## 🔗 Related Files ### Dependencies - `/src/api-client.ts` - Current basic error handling - `/src/composition-manager.ts` - Error propagation points - TASK-002 hybrid fallback system integration ### Analysis References - Current 500 error investigation results - Browser automation error patterns - MCP server stability requirements ## 📈 Success Criteria ### Primary Goals 1. **Error Recovery**: >95% automatic recovery from transient failures 2. **System Stability**: <1% error rate under normal conditions 3. **User Experience**: Clear, actionable error messages 4. **Developer Experience**: Comprehensive debugging tools ### Secondary Goals 1. **Performance**: <10ms error handling overhead 2. **Localization**: Full pt_br and English support 3. **Monitoring**: Real-time error analytics 4. **Documentation**: Complete troubleshooting guides ## 🛡️ Error Handling Patterns ### Retry Strategy Matrix ``` Error Type | Retry Count | Backoff | Circuit Breaker --------------------|-------------|------------|---------------- Network Timeout | 3 | Exponential| Yes 500 Server Error | 5 | Linear | Yes Authentication | 1 | None | No Rate Limiting | 3 | Fixed | Yes Element Not Found | 2 | Linear | No Permission Denied | 0 | None | No ``` ### Circuit Breaker Configuration ``` Service Type | Failure Rate | Time Window | Recovery Time --------------------|--------------|-------------|--------------- API Endpoints | 50% | 60s | 30s Browser Automation | 30% | 30s | 15s NLP Processing | 20% | 120s | 60s Widget Creation | 40% | 45s | 20s ``` ### Localized Error Messages ``` Error Categories (pt_br/en): ├── Connection Errors │ ├── "Erro de conexão com o servidor" / "Server connection error" │ └── "Verifique sua conexão" / "Check your connection" ├── Authentication Errors │ ├── "Token de acesso inválido" / "Invalid access token" │ └── "Faça login novamente" / "Please log in again" ├── Content Errors │ ├── "Conteúdo inválido detectado" / "Invalid content detected" │ └── "Verifique o formato" / "Check the format" └── System Errors ├── "Erro interno do sistema" / "Internal system error" └── "Tente novamente em instantes" / "Try again in a moment" ``` --- **Note**: This task creates a robust error handling foundation that ensures system reliability, improves user experience, and provides comprehensive debugging capabilities for developers.