DynamoDB as a State Machine: How I Stopped Paying for Redundant Lambda Executions

Part of my warrantyAI build series — building an AI-powered warranty management system on AWS, one week at a time. #bedrock #aws #serverless #langchain #aiengineering #building #ai #agents | Harish Aravindan 𝗜 𝗽𝗮𝘂𝘀𝗲𝗱 𝗮𝗻 𝗔𝗜 𝗮𝗴𝗲𝗻𝘁 𝗺𝗶𝗱-𝘄𝗼𝗿𝗸𝗳𝗹𝗼𝘄 𝘁𝗵𝗶𝘀 𝘄𝗲𝗲𝗸 𝗮𝗻𝗱 𝗹𝗲𝘁 𝗮 𝗵𝘂𝗺𝗮𝗻 𝗱𝗲𝗰𝗶𝗱𝗲 𝘄𝗵𝗮𝘁 𝗵𝗮𝗽𝗽𝗲𝗻𝘀 𝗻𝗲𝘅𝘁 𝗪𝗲𝗲𝗸 𝟵 𝗼𝗳 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝘄𝗮𝗿𝗿𝗮𝗻𝘁𝘆𝗔𝗜 - and this one changed how I think about AI pipelines. 𝗧𝗵𝗲 𝗽𝗿𝗼𝗯𝗹𝗲𝗺: Week 8's pipeline classified warranties and sent reminders automatically. Fine for low and medium risk. But for high-risk documents — expired warranties, missing serial numbers, suspicious policy terms — no one should be auto-sending anything without a human in the loop. And honestly? The AI world is finally catching up to this thinking. OpenAI, Anthropic, and Google have all started baking 𝗛𝘂𝗺𝗮𝗻-𝗶𝗻-𝘁𝗵𝗲-𝗟𝗼𝗼𝗽 (𝗛𝗜𝗧𝗟) patterns into their agent frameworks — not as an afterthought, but as a core design primitive. The reason is simple: LLMs are probabilistic. They're very good at pattern recognition across m