# Agentic RAG Implementation Plan
## Comprehensive System Implementation and Testing Strategy

### Executive Summary

This document outlines a systematic approach to implement, test, and deploy the agentic RAG (Retrieval-Augmented Generation) system for CIM document analysis. The plan ensures robust error handling, comprehensive testing, and gradual rollout to minimize risks.

---

## Phase 1: Foundation and Infrastructure (Week 1)

### 1.1 Environment Configuration Setup

#### 1.1.1 Enhanced Environment Variables
```bash
# Agentic RAG Configuration
AGENTIC_RAG_ENABLED=true
AGENTIC_RAG_MAX_AGENTS=6
AGENTIC_RAG_PARALLEL_PROCESSING=true
AGENTIC_RAG_VALIDATION_STRICT=true
AGENTIC_RAG_RETRY_ATTEMPTS=3
AGENTIC_RAG_TIMEOUT_PER_AGENT=60000

# Agent-Specific Configuration
AGENT_DOCUMENT_UNDERSTANDING_ENABLED=true
AGENT_FINANCIAL_ANALYSIS_ENABLED=true
AGENT_MARKET_ANALYSIS_ENABLED=true
AGENT_INVESTMENT_THESIS_ENABLED=true
AGENT_SYNTHESIS_ENABLED=true
AGENT_VALIDATION_ENABLED=true

# Quality Control
AGENTIC_RAG_QUALITY_THRESHOLD=0.8
AGENTIC_RAG_COMPLETENESS_THRESHOLD=0.9
AGENTIC_RAG_CONSISTENCY_CHECK=true

# Monitoring and Logging
AGENTIC_RAG_DETAILED_LOGGING=true
AGENTIC_RAG_PERFORMANCE_TRACKING=true
AGENTIC_RAG_ERROR_REPORTING=true
```

#### 1.1.2 Configuration Schema Updates
- Update `backend/src/config/env.ts` with new agentic RAG configuration
- Add validation for all new environment variables
- Implement configuration validation at startup

### 1.2 Database Schema Enhancements

#### 1.2.1 New Tables for Agentic RAG
```sql
-- Agent execution tracking
CREATE TABLE agent_executions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    document_id UUID REFERENCES documents(id),
    agent_name VARCHAR(100) NOT NULL,
    step_number INTEGER NOT NULL,
    status VARCHAR(50) NOT NULL, -- 'pending', 'processing', 'completed', 'failed'
    input_data JSONB,
    output_data JSONB,
    validation_result JSONB,
    processing_time_ms INTEGER,
    error_message TEXT,
    retry_count INTEGER DEFAULT 0,
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW()
);

-- Agentic RAG processing sessions
CREATE TABLE agentic_rag_sessions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    document_id UUID REFERENCES documents(id),
    user_id UUID REFERENCES users(id),
    strategy VARCHAR(50) NOT NULL, -- 'agentic_rag', 'chunking', 'rag'
    status VARCHAR(50) NOT NULL,
    total_agents INTEGER NOT NULL,
    completed_agents INTEGER DEFAULT 0,
    failed_agents INTEGER DEFAULT 0,
    overall_validation_score DECIMAL(3,2),
    processing_time_ms INTEGER,
    api_calls_count INTEGER,
    total_cost DECIMAL(10,4),
    reasoning_steps JSONB,
    final_result JSONB,
    created_at TIMESTAMP DEFAULT NOW(),
    completed_at TIMESTAMP
);

-- Quality metrics tracking
CREATE TABLE processing_quality_metrics (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    document_id UUID REFERENCES documents(id),
    session_id UUID REFERENCES agentic_rag_sessions(id),
    metric_type VARCHAR(100) NOT NULL, -- 'completeness', 'accuracy', 'consistency', 'relevance'
    metric_value DECIMAL(3,2),
    metric_details JSONB,
    created_at TIMESTAMP DEFAULT NOW()
);
```

#### 1.2.2 Migration Scripts
- Create migration files for new tables
- Implement data migration utilities
- Add rollback capabilities

### 1.3 Enhanced Type Definitions

#### 1.3.1 Agent Types (`backend/src/models/agenticTypes.ts`)
```typescript
export interface AgentStep {
  name: string;
  description: string;
  query: string;
  validation?: (result: any) => boolean;
  retryStrategy?: RetryStrategy;
  timeoutMs?: number;
  maxTokens?: number;
  temperature?: number;
}

export interface AgentExecution {
  id: string;
  documentId: string;
  agentName: string;
  stepNumber: number;
  status: 'pending' | 'processing' | 'completed' | 'failed';
  inputData?: any;
  outputData?: any;
  validationResult?: any;
  processingTimeMs?: number;
  errorMessage?: string;
  retryCount: number;
  createdAt: Date;
  updatedAt: Date;
}

export interface AgenticRAGSession {
  id: string;
  documentId: string;
  userId: string;
  strategy: 'agentic_rag' | 'chunking' | 'rag';
  status: 'pending' | 'processing' | 'completed' | 'failed';
  totalAgents: number;
  completedAgents: number;
  failedAgents: number;
  overallValidationScore?: number;
  processingTimeMs?: number;
  apiCallsCount: number;
  totalCost?: number;
  reasoningSteps: AgentExecution[];
  finalResult?: any;
  createdAt: Date;
  completedAt?: Date;
}

export interface QualityMetrics {
  id: string;
  documentId: string;
  sessionId: string;
  metricType: 'completeness' | 'accuracy' | 'consistency' | 'relevance';
  metricValue: number;
  metricDetails: any;
  createdAt: Date;
}

export interface AgenticRAGResult {
  success: boolean;
  summary: string;
  analysisData: CIMReview;
  reasoningSteps: AgentExecution[];
  processingTime: number;
  apiCalls: number;
  totalCost: number;
  qualityMetrics: QualityMetrics[];
  sessionId: string;
  error?: string;
}
```

---

## Phase 2: Core Agentic RAG Implementation (Week 2)

### 2.1 Enhanced Agentic RAG Processor

#### 2.1.1 Agent Registry System
```typescript
// backend/src/services/agenticRAGProcessor.ts
class AgentRegistry {
  private agents: Map<string, AgentStep> = new Map();
  
  registerAgent(name: string, agent: AgentStep): void {
    this.agents.set(name, agent);
  }
  
  getAgent(name: string): AgentStep | undefined {
    return this.agents.get(name);
  }
  
  getAllAgents(): AgentStep[] {
    return Array.from(this.agents.values());
  }
  
  validateAgentConfiguration(): boolean {
    // Validate all agents have required fields
    return Array.from(this.agents.values()).every(agent => 
      agent.name && agent.description && agent.query
    );
  }
}
```

#### 2.1.2 Enhanced Agent Execution Engine
```typescript
class AgentExecutionEngine {
  private registry: AgentRegistry;
  private sessionManager: AgenticRAGSessionManager;
  private qualityAssessor: QualityAssessmentService;
  
  async executeAgent(
    agentName: string, 
    documentId: string, 
    inputData: any,
    sessionId: string
  ): Promise<AgentExecution> {
    const agent = this.registry.getAgent(agentName);
    if (!agent) {
      throw new Error(`Agent ${agentName} not found`);
    }
    
    const execution = await this.sessionManager.createExecution(
      sessionId, agentName, inputData
    );
    
    try {
      // Execute with retry logic
      const result = await this.executeWithRetry(agent, inputData, execution);
      
      // Validate result
      const validation = agent.validation ? agent.validation(result) : true;
      
      // Update execution
      await this.sessionManager.updateExecution(execution.id, {
        status: 'completed',
        outputData: result,
        validationResult: validation,
        processingTimeMs: Date.now() - execution.createdAt.getTime()
      });
      
      return execution;
    } catch (error) {
      await this.sessionManager.updateExecution(execution.id, {
        status: 'failed',
        errorMessage: error.message
      });
      throw error;
    }
  }
  
  private async executeWithRetry(
    agent: AgentStep, 
    inputData: any, 
    execution: AgentExecution
  ): Promise<any> {
    const maxRetries = agent.retryStrategy?.maxRetries || 3;
    let lastError: Error;
    
    for (let attempt = 1; attempt <= maxRetries; attempt++) {
      try {
        const result = await this.callLLM({
          prompt: agent.query,
          systemPrompt: this.getAgentSystemPrompt(agent.name),
          maxTokens: agent.maxTokens || 3000,
          temperature: agent.temperature || 0.1,
          timeoutMs: agent.timeoutMs || 60000
        });
        
        if (!result.success) {
          throw new Error(result.error);
        }
        
        return this.parseAgentResult(result.content);
      } catch (error) {
        lastError = error;
        await this.sessionManager.updateExecution(execution.id, {
          retryCount: attempt
        });
        
        if (attempt < maxRetries) {
          await this.delay(agent.retryStrategy?.delayMs || 1000 * attempt);
        }
      }
    }
    
    throw lastError;
  }
}
```

#### 2.1.3 Quality Assessment Service
```typescript
class QualityAssessmentService {
  async assessQuality(
    analysisData: CIMReview, 
    reasoningSteps: AgentExecution[]
  ): Promise<QualityMetrics[]> {
    const metrics: QualityMetrics[] = [];
    
    // Completeness assessment
    const completeness = this.assessCompleteness(analysisData);
    metrics.push({
      metricType: 'completeness',
      metricValue: completeness.score,
      metricDetails: completeness.details
    });
    
    // Consistency assessment
    const consistency = this.assessConsistency(reasoningSteps);
    metrics.push({
      metricType: 'consistency',
      metricValue: consistency.score,
      metricDetails: consistency.details
    });
    
    // Accuracy assessment
    const accuracy = await this.assessAccuracy(analysisData);
    metrics.push({
      metricType: 'accuracy',
      metricValue: accuracy.score,
      metricDetails: accuracy.details
    });
    
    return metrics;
  }
  
  private assessCompleteness(analysisData: CIMReview): { score: number; details: any } {
    const requiredFields = this.getRequiredFields();
    const presentFields = this.countPresentFields(analysisData, requiredFields);
    const score = presentFields / requiredFields.length;
    
    return {
      score,
      details: {
        requiredFields: requiredFields.length,
        presentFields,
        missingFields: requiredFields.filter(field => !this.hasField(analysisData, field))
      }
    };
  }
  
  private assessConsistency(reasoningSteps: AgentExecution[]): { score: number; details: any } {
    // Check for contradictions between agent outputs
    const contradictions = this.findContradictions(reasoningSteps);
    const score = Math.max(0, 1 - (contradictions.length * 0.1));
    
    return {
      score,
      details: {
        contradictions,
        totalSteps: reasoningSteps.length
      }
    };
  }
  
  private async assessAccuracy(analysisData: CIMReview): Promise<{ score: number; details: any }> {
    // Use LLM to validate accuracy of key claims
    const validationPrompt = this.buildAccuracyValidationPrompt(analysisData);
    const result = await this.callLLM({
      prompt: validationPrompt,
      systemPrompt: 'You are a quality assurance specialist. Validate the accuracy of the provided analysis.',
      maxTokens: 1000,
      temperature: 0.1
    });
    
    const validation = JSON.parse(result.content);
    return {
      score: validation.accuracyScore,
      details: validation.issues
    };
  }
}
```

### 2.2 Session Management

#### 2.2.1 Agentic RAG Session Manager
```typescript
class AgenticRAGSessionManager {
  async createSession(
    documentId: string, 
    userId: string, 
    strategy: string
  ): Promise<AgenticRAGSession> {
    const session: AgenticRAGSession = {
      id: generateUUID(),
      documentId,
      userId,
      strategy,
      status: 'pending',
      totalAgents: 6, // Document Understanding, Financial, Market, Thesis, Synthesis, Validation
      completedAgents: 0,
      failedAgents: 0,
      apiCallsCount: 0,
      reasoningSteps: [],
      createdAt: new Date()
    };
    
    await this.saveSession(session);
    return session;
  }
  
  async updateSession(
    sessionId: string, 
    updates: Partial<AgenticRAGSession>
  ): Promise<void> {
    await this.updateSessionInDatabase(sessionId, updates);
  }
  
  async createExecution(
    sessionId: string, 
    agentName: string, 
    inputData: any
  ): Promise<AgentExecution> {
    const execution: AgentExecution = {
      id: generateUUID(),
      documentId: '', // Will be set from session
      agentName,
      stepNumber: await this.getNextStepNumber(sessionId),
      status: 'pending',
      inputData,
      retryCount: 0,
      createdAt: new Date(),
      updatedAt: new Date()
    };
    
    await this.saveExecution(execution);
    return execution;
  }
}
```

---

## Phase 2.5: Main Pipeline Integration (Week 2.5)

### 2.5.1 Integrate Agentic RAG into Main Document Processing Pipeline
- Integrate agentic RAG into `documentProcessingService` to allow selection and execution of the agentic RAG strategy.
- Refactor `unifiedDocumentProcessor` to support multiple processing strategies, including agentic RAG, chunking, and classic RAG.
- Ensure seamless handoff between document upload, processing, and agentic RAG execution.

### 2.5.2 Strategy Selection Logic
- Implement strategy selection logic based on environment variables, feature flags, user roles, or document characteristics.
- Allow dynamic switching between agentic RAG and other strategies for A/B testing and canary deployments.
- Expose strategy selection in the backend API and log all strategy decisions for monitoring.

---

## Phase 2.6: Database Integration (Week 2.5)

### 2.6.1 Persist Agentic RAG Sessions
- Save agentic RAG sessions to the database using the new `agentic_rag_sessions` table.
- Store all reasoning steps (agent executions) and quality metrics for each session.
- Ensure atomicity and consistency of session, execution, and metrics data.

### 2.6.2 Performance and Cost Tracking
- Track and persist performance metrics (processing time, API calls, cost) for each session.
- Implement database queries for retrieving historical performance and quality data for analytics and monitoring.
- Add indexes and optimize queries for efficient retrieval of session and metrics data.

---

## Phase 2.7: API Integration (Week 2.5)

### 2.7.1 Agentic RAG Endpoints
- Add new API endpoints for initiating agentic RAG processing, retrieving session status, and fetching results.
- Update existing document processing endpoints to support agentic RAG as a selectable strategy.
- Implement endpoints for comparing agentic RAG results with other strategies (e.g., chunking, classic RAG).

### 2.7.2 API Documentation and Error Handling
- Update OpenAPI/Swagger documentation to include new endpoints and parameters.
- Ensure robust error handling and clear error messages for all agentic RAG API operations.
- Add tests for all new and updated endpoints.

---

## Phase 2.8: Frontend Integration (Week 2.5)

### 2.8.1 UI Enhancements for Agentic RAG
- Add agentic RAG processing options to the document upload and processing UI.
- Display reasoning steps, agent outputs, and quality metrics in the document viewer and results pages.
- Provide real-time feedback on agentic RAG session status and progress.

### 2.8.2 Strategy Comparison Interface
- Implement a UI for comparing results and quality metrics between agentic RAG and other strategies.
- Allow users to select and view detailed reasoning steps and quality assessments for each strategy.
- Gather user feedback on agentic RAG results for continuous improvement.

---

## Phase 3: Testing Framework (Week 3)

### 3.1 Unit Testing Strategy

#### 3.1.1 Agent Testing
```typescript
// backend/src/services/__tests__/agenticRAGProcessor.test.ts
describe('AgenticRAGProcessor', () => {
  let processor: AgenticRAGProcessor;
  let mockLLMService: jest.Mocked<LLMService>;
  let mockSessionManager: jest.Mocked<AgenticRAGSessionManager>;
  
  beforeEach(() => {
    mockLLMService = createMockLLMService();
    mockSessionManager = createMockSessionManager();
    processor = new AgenticRAGProcessor(mockLLMService, mockSessionManager);
  });
  
  describe('processDocument', () => {
    it('should successfully process document with all agents', async () => {
      // Arrange
      const documentText = loadTestDocument('sample_cim.txt');
      const documentId = 'test-doc-123';
      
      // Mock successful agent responses
      mockLLMService.callLLM.mockResolvedValue({
        success: true,
        content: JSON.stringify(createMockAgentResponse('document_understanding'))
      });
      
      // Act
      const result = await processor.processDocument(documentText, documentId);
      
      // Assert
      expect(result.success).toBe(true);
      expect(result.reasoningSteps).toHaveLength(6);
      expect(result.qualityMetrics).toBeDefined();
      expect(result.processingTime).toBeGreaterThan(0);
    });
    
    it('should handle agent failures gracefully', async () => {
      // Arrange
      const documentText = loadTestDocument('sample_cim.txt');
      const documentId = 'test-doc-123';
      
      // Mock one agent failure
      mockLLMService.callLLM
        .mockResolvedValueOnce({
          success: true,
          content: JSON.stringify(createMockAgentResponse('document_understanding'))
        })
        .mockRejectedValueOnce(new Error('Financial analysis failed'));
      
      // Act
      const result = await processor.processDocument(documentText, documentId);
      
      // Assert
      expect(result.success).toBe(false);
      expect(result.error).toContain('Financial analysis failed');
      expect(result.reasoningSteps).toHaveLength(1); // Only first agent completed
    });
    
    it('should retry failed agents according to retry strategy', async () => {
      // Arrange
      const documentText = loadTestDocument('sample_cim.txt');
      const documentId = 'test-doc-123';
      
      // Mock agent that fails twice then succeeds
      mockLLMService.callLLM
        .mockRejectedValueOnce(new Error('Temporary failure'))
        .mockRejectedValueOnce(new Error('Temporary failure'))
        .mockResolvedValueOnce({
          success: true,
          content: JSON.stringify(createMockAgentResponse('financial_analysis'))
        });
      
      // Act
      const result = await processor.processDocument(documentText, documentId);
      
      // Assert
      expect(mockLLMService.callLLM).toHaveBeenCalledTimes(3);
      expect(result.success).toBe(true);
    });
  });
  
  describe('quality assessment', () => {
    it('should assess completeness correctly', async () => {
      // Arrange
      const analysisData = createCompleteCIMReview();
      
      // Act
      const completeness = await processor.assessCompleteness(analysisData);
      
      // Assert
      expect(completeness.score).toBeGreaterThan(0.9);
      expect(completeness.details.missingFields).toHaveLength(0);
    });
    
    it('should detect inconsistencies between agents', async () => {
      // Arrange
      const reasoningSteps = createInconsistentAgentSteps();
      
      // Act
      const consistency = await processor.assessConsistency(reasoningSteps);
      
      // Assert
      expect(consistency.score).toBeLessThan(1.0);
      expect(consistency.details.contradictions).toHaveLength(1);
    });
  });
});
```

#### 3.1.2 Integration Testing
```typescript
// backend/src/services/__tests__/agenticRAGIntegration.test.ts
describe('AgenticRAG Integration Tests', () => {
  let testDatabase: TestDatabase;
  let processor: AgenticRAGProcessor;
  
  beforeAll(async () => {
    testDatabase = await setupTestDatabase();
    processor = new AgenticRAGProcessor();
  });
  
  afterAll(async () => {
    await testDatabase.cleanup();
  });
  
  beforeEach(async () => {
    await testDatabase.reset();
  });
  
  it('should process real CIM document end-to-end', async () => {
    // Arrange
    const documentText = await loadRealCIMDocument();
    const documentId = await createTestDocument(testDatabase, documentText);
    
    // Act
    const result = await processor.processDocument(documentText, documentId);
    
    // Assert
    expect(result.success).toBe(true);
    expect(result.analysisData).toMatchSchema(cimReviewSchema);
    expect(result.qualityMetrics.every(m => m.metricValue >= 0.8)).toBe(true);
    
    // Verify database records
    const session = await testDatabase.getSession(result.sessionId);
    expect(session.status).toBe('completed');
    expect(session.completedAgents).toBe(6);
    expect(session.failedAgents).toBe(0);
  });
  
  it('should handle large documents within time limits', async () => {
    // Arrange
    const largeDocument = await loadLargeCIMDocument(); // 100k+ characters
    const documentId = await createTestDocument(testDatabase, largeDocument);
    
    // Act
    const startTime = Date.now();
    const result = await processor.processDocument(largeDocument, documentId);
    const processingTime = Date.now() - startTime;
    
    // Assert
    expect(result.success).toBe(true);
    expect(processingTime).toBeLessThan(300000); // 5 minutes max
    expect(result.apiCalls).toBeLessThan(20); // Reasonable API call count
  });
  
  it('should maintain data consistency across retries', async () => {
    // Arrange
    const documentText = await loadRealCIMDocument();
    const documentId = await createTestDocument(testDatabase, documentText);
    
    // Mock intermittent failures
    const originalCallLLM = processor['callLLM'];
    let callCount = 0;
    processor['callLLM'] = async (request: any) => {
      callCount++;
      if (callCount % 3 === 0) {
        throw new Error('Intermittent failure');
      }
      return originalCallLLM.call(processor, request);
    };
    
    // Act
    const result = await processor.processDocument(documentText, documentId);
    
    // Assert
    expect(result.success).toBe(true);
    expect(result.reasoningSteps.every(step => step.status === 'completed')).toBe(true);
  });
});
```

### 3.2 Performance Testing

#### 3.2.1 Load Testing
```typescript
// backend/src/test/performance/agenticRAGLoadTest.ts
describe('AgenticRAG Load Testing', () => {
  it('should handle concurrent document processing', async () => {
    // Arrange
    const documents = await loadMultipleCIMDocuments(10);
    const processors = Array(5).fill(null).map(() => new AgenticRAGProcessor());
    
    // Act
    const startTime = Date.now();
    const results = await Promise.all(
      documents.map((doc, index) => 
        processors[index % processors.length].processDocument(doc.text, doc.id)
      )
    );
    const totalTime = Date.now() - startTime;
    
    // Assert
    expect(results.every(r => r.success)).toBe(true);
    expect(totalTime).toBeLessThan(600000); // 10 minutes max
    expect(results.every(r => r.processingTime < 120000)).toBe(true); // 2 minutes per doc
  });
  
  it('should maintain quality under load', async () => {
    // Arrange
    const documents = await loadMultipleCIMDocuments(20);
    const processor = new AgenticRAGProcessor();
    
    // Act
    const results = await Promise.all(
      documents.map(doc => processor.processDocument(doc.text, doc.id))
    );
    
    // Assert
    const avgQuality = results.reduce((sum, r) => 
      sum + r.qualityMetrics.reduce((qSum, m) => qSum + m.metricValue, 0) / r.qualityMetrics.length, 0
    ) / results.length;
    
    expect(avgQuality).toBeGreaterThan(0.85);
  });
});
```

---

## Phase 4: Error Handling and Resilience (Week 4)

### 4.1 Comprehensive Error Handling

#### 4.1.1 Error Classification System
```typescript
enum AgenticRAGErrorType {
  AGENT_EXECUTION_FAILED = 'AGENT_EXECUTION_FAILED',
  VALIDATION_FAILED = 'VALIDATION_FAILED',
  TIMEOUT_ERROR = 'TIMEOUT_ERROR',
  RATE_LIMIT_ERROR = 'RATE_LIMIT_ERROR',
  INVALID_RESPONSE = 'INVALID_RESPONSE',
  DATABASE_ERROR = 'DATABASE_ERROR',
  CONFIGURATION_ERROR = 'CONFIGURATION_ERROR'
}

class AgenticRAGError extends Error {
  constructor(
    message: string,
    public type: AgenticRAGErrorType,
    public agentName?: string,
    public retryable: boolean = false,
    public context?: any
  ) {
    super(message);
    this.name = 'AgenticRAGError';
  }
}

class ErrorHandler {
  handleError(error: AgenticRAGError, sessionId: string): Promise<void> {
    logger.error('Agentic RAG error occurred', {
      sessionId,
      errorType: error.type,
      agentName: error.agentName,
      retryable: error.retryable,
      context: error.context
    });
    
    switch (error.type) {
      case AgenticRAGErrorType.AGENT_EXECUTION_FAILED:
        return this.handleAgentExecutionError(error, sessionId);
      case AgenticRAGErrorType.VALIDATION_FAILED:
        return this.handleValidationError(error, sessionId);
      case AgenticRAGErrorType.TIMEOUT_ERROR:
        return this.handleTimeoutError(error, sessionId);
      case AgenticRAGErrorType.RATE_LIMIT_ERROR:
        return this.handleRateLimitError(error, sessionId);
      default:
        return this.handleGenericError(error, sessionId);
    }
  }
  
  private async handleAgentExecutionError(error: AgenticRAGError, sessionId: string): Promise<void> {
    if (error.retryable) {
      await this.retryAgentExecution(error.agentName!, sessionId);
    } else {
      await this.markSessionAsFailed(sessionId, error.message);
    }
  }
  
  private async handleValidationError(error: AgenticRAGError, sessionId: string): Promise<void> {
    // Attempt to fix validation issues
    const fixedResult = await this.attemptValidationFix(sessionId);
    if (fixedResult) {
      await this.updateSessionResult(sessionId, fixedResult);
    } else {
      await this.markSessionAsFailed(sessionId, 'Validation could not be fixed');
    }
  }
}
```

#### 4.1.2 Circuit Breaker Pattern
```typescript
class CircuitBreaker {
  private failures = 0;
  private lastFailureTime = 0;
  private state: 'CLOSED' | 'OPEN' | 'HALF_OPEN' = 'CLOSED';
  
  constructor(
    private failureThreshold: number = 5,
    private timeoutMs: number = 60000
  ) {}
  
  async execute<T>(operation: () => Promise<T>): Promise<T> {
    if (this.state === 'OPEN') {
      if (Date.now() - this.lastFailureTime > this.timeoutMs) {
        this.state = 'HALF_OPEN';
      } else {
        throw new AgenticRAGError(
          'Circuit breaker is open',
          AgenticRAGErrorType.AGENT_EXECUTION_FAILED,
          undefined,
          true
        );
      }
    }
    
    try {
      const result = await operation();
      this.onSuccess();
      return result;
    } catch (error) {
      this.onFailure();
      throw error;
    }
  }
  
  private onSuccess(): void {
    this.failures = 0;
    this.state = 'CLOSED';
  }
  
  private onFailure(): void {
    this.failures++;
    this.lastFailureTime = Date.now();
    
    if (this.failures >= this.failureThreshold) {
      this.state = 'OPEN';
    }
  }
}
```

### 4.2 Fallback Strategies

#### 4.2.1 Graceful Degradation
```typescript
class FallbackStrategy {
  async executeWithFallback(
    primaryOperation: () => Promise<any>,
    fallbackOperation: () => Promise<any>
  ): Promise<any> {
    try {
      return await primaryOperation();
    } catch (error) {
      logger.warn('Primary operation failed, using fallback', { error });
      return await fallbackOperation();
    }
  }
  
  async processWithReducedAgents(
    documentText: string,
    documentId: string,
    failedAgents: string[]
  ): Promise<AgenticRAGResult> {
    // Use only essential agents for basic analysis
    const essentialAgents = ['document_understanding', 'synthesis'];
    const availableAgents = essentialAgents.filter(agent => 
      !failedAgents.includes(agent)
    );
    
    if (availableAgents.length === 0) {
      throw new AgenticRAGError(
        'No essential agents available',
        AgenticRAGErrorType.AGENT_EXECUTION_FAILED,
        undefined,
        false
      );
    }
    
    return await this.processWithAgents(documentText, documentId, availableAgents);
  }
}
```

---

## Phase 5: Monitoring and Observability (Week 5)

### 5.1 Comprehensive Logging

#### 5.1.1 Structured Logging
```typescript
class AgenticRAGLogger {
  logAgentStart(sessionId: string, agentName: string, inputData: any): void {
    logger.info('Agent execution started', {
      sessionId,
      agentName,
      inputDataKeys: Object.keys(inputData),
      timestamp: new Date().toISOString()
    });
  }
  
  logAgentSuccess(
    sessionId: string, 
    agentName: string, 
    result: any, 
    processingTime: number
  ): void {
    logger.info('Agent execution completed', {
      sessionId,
      agentName,
      resultKeys: Object.keys(result),
      processingTime,
      timestamp: new Date().toISOString()
    });
  }
  
  logAgentFailure(
    sessionId: string, 
    agentName: string, 
    error: Error, 
    retryCount: number
  ): void {
    logger.error('Agent execution failed', {
      sessionId,
      agentName,
      error: error.message,
      retryCount,
      timestamp: new Date().toISOString()
    });
  }
  
  logSessionComplete(session: AgenticRAGSession): void {
    logger.info('Agentic RAG session completed', {
      sessionId: session.id,
      documentId: session.documentId,
      strategy: session.strategy,
      totalAgents: session.totalAgents,
      completedAgents: session.completedAgents,
      failedAgents: session.failedAgents,
      processingTime: session.processingTimeMs,
      apiCalls: session.apiCallsCount,
      totalCost: session.totalCost,
      overallValidationScore: session.overallValidationScore,
      timestamp: new Date().toISOString()
    });
  }
}
```

#### 5.1.2 Performance Metrics
```typescript
class PerformanceMetrics {
  private metrics: Map<string, number[]> = new Map();
  
  recordMetric(name: string, value: number): void {
    if (!this.metrics.has(name)) {
      this.metrics.set(name, []);
    }
    this.metrics.get(name)!.push(value);
  }
  
  getAverageMetric(name: string): number {
    const values = this.metrics.get(name);
    if (!values || values.length === 0) return 0;
    return values.reduce((sum, val) => sum + val, 0) / values.length;
  }
  
  getPercentileMetric(name: string, percentile: number): number {
    const values = this.metrics.get(name);
    if (!values || values.length === 0) return 0;
    
    const sorted = [...values].sort((a, b) => a - b);
    const index = Math.ceil((percentile / 100) * sorted.length) - 1;
    return sorted[index];
  }
  
  generateReport(): PerformanceReport {
    return {
      averageProcessingTime: this.getAverageMetric('processing_time'),
      p95ProcessingTime: this.getPercentileMetric('processing_time', 95),
      averageApiCalls: this.getAverageMetric('api_calls'),
      averageCost: this.getAverageMetric('total_cost'),
      successRate: this.getAverageMetric('success_rate'),
      averageQualityScore: this.getAverageMetric('quality_score')
    };
  }
}
```

### 5.2 Health Checks and Alerts

#### 5.2.1 Health Check Endpoints
```typescript
// backend/src/routes/health.ts
router.get('/health/agentic-rag', async (req, res) => {
  try {
    const healthStatus = await agenticRAGHealthChecker.checkHealth();
    res.json(healthStatus);
  } catch (error) {
    res.status(500).json({ error: 'Health check failed' });
  }
});

router.get('/health/agentic-rag/metrics', async (req, res) => {
  try {
    const metrics = await performanceMetrics.generateReport();
    res.json(metrics);
  } catch (error) {
    res.status(500).json({ error: 'Metrics retrieval failed' });
  }
});
```

#### 5.2.2 Alert System
```typescript
class AlertSystem {
  async checkAlerts(): Promise<void> {
    const metrics = await performanceMetrics.generateReport();
    
    // Check for performance degradation
    if (metrics.averageProcessingTime > 120000) { // 2 minutes
      await this.sendAlert('HIGH_PROCESSING_TIME', {
        current: metrics.averageProcessingTime,
        threshold: 120000
      });
    }
    
    // Check for high failure rate
    if (metrics.successRate < 0.9) {
      await this.sendAlert('LOW_SUCCESS_RATE', {
        current: metrics.successRate,
        threshold: 0.9
      });
    }
    
    // Check for high costs
    if (metrics.averageCost > 5.0) { // $5 per document
      await this.sendAlert('HIGH_COST', {
        current: metrics.averageCost,
        threshold: 5.0
      });
    }
  }
  
  private async sendAlert(type: string, data: any): Promise<void> {
    logger.warn('Alert triggered', { type, data });
    // Integrate with external alerting system (Slack, email, etc.)
  }
}
```

---

## Phase 6: Deployment and Rollout (Week 6)

### 6.1 Gradual Rollout Strategy

#### 6.1.1 Feature Flags
```typescript
class FeatureFlags {
  private flags: Map<string, boolean> = new Map();
  
  constructor() {
    this.loadFlagsFromEnvironment();
  }
  
  isEnabled(flag: string): boolean {
    return this.flags.get(flag) || false;
  }
  
  private loadFlagsFromEnvironment(): void {
    this.flags.set('AGENTIC_RAG_ENABLED', process.env.AGENTIC_RAG_ENABLED === 'true');
    this.flags.set('AGENTIC_RAG_BETA', process.env.AGENTIC_RAG_BETA === 'true');
    this.flags.set('AGENTIC_RAG_PRODUCTION', process.env.AGENTIC_RAG_PRODUCTION === 'true');
  }
}
```

#### 6.1.2 Canary Deployment
```typescript
class CanaryDeployment {
  private canaryPercentage: number = 0;
  
  async shouldUseAgenticRAG(documentId: string, userId: string): Promise<boolean> {
    if (!featureFlags.isEnabled('AGENTIC_RAG_ENABLED')) {
      return false;
    }
    
    // Check if user is in beta
    if (featureFlags.isEnabled('AGENTIC_RAG_BETA')) {
      const user = await userService.getUser(userId);
      return user.role === 'admin' || user.email.includes('@bpcp.com');
    }
    
    // Check canary percentage
    const hash = this.hashDocumentId(documentId);
    const percentage = hash % 100;
    
    return percentage < this.canaryPercentage;
  }
  
  async incrementCanary(): Promise<void> {
    if (this.canaryPercentage < 100) {
      this.canaryPercentage += 10;
      logger.info('Canary percentage increased', { percentage: this.canaryPercentage });
    }
  }
  
  private hashDocumentId(documentId: string): number {
    let hash = 0;
    for (let i = 0; i < documentId.length; i++) {
      const char = documentId.charCodeAt(i);
      hash = ((hash << 5) - hash) + char;
      hash = hash & hash; // Convert to 32-bit integer
    }
    return Math.abs(hash);
  }
}
```

### 6.2 Rollback Strategy

#### 6.2.1 Automatic Rollback
```typescript
class RollbackManager {
  private rollbackThresholds = {
    errorRate: 0.1, // 10% error rate
    processingTime: 300000, // 5 minutes average
    costPerDocument: 10.0 // $10 per document
  };
  
  async checkRollbackConditions(): Promise<boolean> {
    const metrics = await performanceMetrics.generateReport();
    
    const shouldRollback = 
      metrics.successRate < (1 - this.rollbackThresholds.errorRate) ||
      metrics.averageProcessingTime > this.rollbackThresholds.processingTime ||
      metrics.averageCost > this.rollbackThresholds.costPerDocument;
    
    if (shouldRollback) {
      await this.executeRollback();
      return true;
    }
    
    return false;
  }
  
  private async executeRollback(): Promise<void> {
    logger.warn('Executing automatic rollback due to performance issues');
    
    // Disable agentic RAG
    process.env.AGENTIC_RAG_ENABLED = 'false';
    
    // Switch to chunking strategy
    process.env.PROCESSING_STRATEGY = 'chunking';
    
    // Send alert
    await alertSystem.sendAlert('AUTOMATIC_ROLLBACK', {
      reason: 'Performance degradation detected',
      timestamp: new Date().toISOString()
    });
  }
}
```

---

## Phase 7: Documentation and Training (Week 7)

### 7.1 Technical Documentation

#### 7.1.1 API Documentation
- Complete OpenAPI/Swagger documentation for all agentic RAG endpoints
- Integration guides for different client types
- Error code reference and troubleshooting guide

#### 7.1.2 Architecture Documentation
- System architecture diagrams
- Data flow documentation
- Performance characteristics and limitations

### 7.2 Operational Documentation

#### 7.2.1 Deployment Guide
- Step-by-step deployment instructions
- Configuration management
- Environment setup procedures

#### 7.2.2 Monitoring Guide
- Dashboard setup instructions
- Alert configuration
- Troubleshooting procedures

---

## Testing Checklist

### Unit Tests
- [ ] All agent implementations
- [ ] Error handling mechanisms
- [ ] Quality assessment algorithms
- [ ] Session management
- [ ] Configuration validation

### Integration Tests
- [ ] End-to-end document processing
- [ ] Database operations
- [ ] LLM service integration
- [ ] Error recovery scenarios

### Performance Tests
- [ ] Load testing with multiple concurrent requests
- [ ] Memory usage under load
- [ ] API call optimization
- [ ] Cost analysis

### Security Tests
- [ ] Input validation
- [ ] Authentication and authorization
- [ ] Data sanitization
- [ ] Rate limiting

### User Acceptance Tests
- [ ] Quality comparison with existing system
- [ ] User interface integration
- [ ] Error message clarity
- [ ] Performance expectations

---

## Success Criteria

### Functional Requirements
- [ ] All 6 agents execute successfully
- [ ] Quality metrics meet minimum thresholds (0.8+)
- [ ] Processing time under 5 minutes for typical documents
- [ ] Cost per document under $5
- [ ] 95% success rate

### Non-Functional Requirements
- [ ] System handles 10+ concurrent requests
- [ ] Graceful degradation under load
- [ ] Comprehensive error handling
- [ ] Detailed monitoring and alerting
- [ ] Easy rollback capability

### Quality Assurance
- [ ] All tests passing
- [ ] Code coverage > 90%
- [ ] Performance benchmarks met
- [ ] Security review completed
- [ ] Documentation complete

---

## Risk Mitigation

### Technical Risks
1. **LLM API failures**: Implement circuit breakers and fallback strategies
2. **Performance degradation**: Monitor and auto-rollback
3. **Data consistency issues**: Implement validation and retry logic
4. **Cost overruns**: Set strict limits and monitoring

### Operational Risks
1. **Deployment issues**: Use canary deployment and feature flags
2. **Monitoring gaps**: Comprehensive logging and alerting
3. **User adoption**: Gradual rollout with feedback collection
4. **Support burden**: Extensive documentation and training

---

## Timeline Summary

- **Week 1**: Foundation and Infrastructure
- **Week 2**: Core Agentic RAG Implementation
- **Week 3**: Testing Framework
- **Week 4**: Error Handling and Resilience
- **Week 5**: Monitoring and Observability
- **Week 6**: Deployment and Rollout
- **Week 7**: Documentation and Training

Total Implementation Time: 7 weeks

This plan ensures systematic implementation with comprehensive testing, error handling, and monitoring at each phase, minimizing risks and ensuring successful deployment of the agentic RAG system. 