The Hidden Cost of VPC-Deployed Bedrock Agents: A NAT Gateway Surprise

This real-world investigation reveals how Bedrock AgentCore deployments in VPC mode can incur unexpected NAT Gateway costs, with 659GB of traffic accumulating in just six days. The critical takeaway is not the $29 charge itself, but the monitoring blind spot that allowed undetected traffic to persist while the agent was completely inactive. For organizations scaling AI agent workloads, implementing proper CloudWatch metrics and VPC Flow Logs monitoring is essential to prevent cost surprises.