Removing an empty dictionary can look like a harmless refactor. In a DynamoDB application, it can break the next write.

That was one of two bugs explored during our October 28th Quito Lambda session, LocalStack: A safe environment for experimenting with AI agents and AWS. Gandhy García, a software developer at Stack Builders, used a small game API to show an AI coding agent reproducing failures, changing code, and running integration tests against local AWS service emulation.

The interesting part was the feedback available to the agent. It could exercise the application's database operations without needing credentials for a live AWS environment.…