Give Your Coding Agent a Real Cloud to Break
Blog post from LocalStack
An experiment used Claude Code with the LocalStack MCP server, IAM enforcement, and App Inspector tracing to diagnose and repair a CDK-based S3, SQS, Lambda, and DynamoDB inventory pipeline without accessing a real AWS account. The pipeline’s original batch-processing behavior caused one malformed record to fail an entire SQS batch repeatedly, producing duplicate DynamoDB writes for healthy records and eventually sending all records to the dead-letter queue. After deploying and reproducing the issue in LocalStack, the agent used traces to identify DynamoDB type validation as the failure source and IAM events to rule out permission problems. It fixed the system by enabling Lambda partial batch responses, catching failures per message, validating malformed data before writing, and replacing random record IDs with deterministic keys to make writes idempotent. Verification showed that healthy rows were stored once, the malformed row alone reached the DLQ after the configured retries, and production queue settings were restored; the run reportedly took about 17 minutes, used 32 MCP calls, and incurred no cloud charges.
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