jChatbot UI Integration:

• Amazon Lex V2: Proper chatbot interface with BedrockAgentIntent for seamless Bedrock integration • Web Chat UI: React/Vue frontend for web users • Mobile App: Native mobile application support • Chat Orchestrator Lambda: Routes conversations between Lex and Bedrock services

VPC & Networking (us-east-1):

• VPC: Proper 10.0.0.0/16 CIDR with public/private subnets • Internet Gateway: For public internet access • Application Load Balancer: Distributes traffic in public subnet • NAT Gateway: Enables outbound internet access from private subnet • VPC Endpoints: Private connections to Bedrock services via AWS PrivateLink • bedrock endpoint for control plane APIs • bedrock-runtime endpoint for model invocations

Enhanced Architecture Flow:

1. User Interaction: Users interact via web UI or mobile app
2. Lex Integration: Amazon Lex V2 processes natural language and routes to Bedrock using BedrockAgentIntent
3. Private Connectivity: All Bedrock calls go through VPC endpoints (no internet required)
4. Agent Processing: Bedrock Agent generates SQL and invokes Lambda functions
5. Data Operations: Lambda functions interact with RDS (appointments) and OpenSearch (RAG)

Security Enhancements:

• Private Subnets: All compute resources in private subnets • VPC Endpoints: Secure, private communication with Bedrock • IAM Roles: Least-privilege access for all services • Encryption: KMS keys for data at rest and in transit

Key Benefits:

• No Internet Dependency: Bedrock access via VPC endpoints • Scalable UI: Multiple frontend options (web, mobile) • Secure: All traffic stays within AWS network • Cost Optimized: VPC endpoints reduce data transfer costs • Monitored: Comprehensive logging and tracing

Architecture Components:

Core Bedrock Services:

• Bedrock Agent: Handles appointment scheduling with SQL generation capabilities • Bedrock Knowledge Base: Manages RAG-based Q&A functionality • Foundation Model: Claude/Titan for natural language processing

Agent Action Groups:

• Appointment Scheduler Function: Lambda function that generates and executes SQL statements (INSERT, UPDATE, DELETE, availability checks) • RAG Query Function: Lambda function for document retrieval and answer generation