Rapid Patterns

Pattern Graduation Triggers

These are the specific signals to move from the rapid/cheap pattern to something more robust:

AI-Powered App: Cost Traps

• Bedrock Knowledge Base with OpenSearch Serverless = ~$700/month minimum. Use Bedrock’s managed vector store instead.
• Start with Nova Micro for classification/routing, Nova Lite for generation — cheapest Bedrock models.
• Store conversation history in DynamoDB, not in-memory (Lambda is stateless) and not S3 (too slow for chat).
• Don’t build an agent unless you need tool use — InvokeModel directly is simpler and cheaper.