AI BriefingVerifying Automated Security Configuration When Deploying a Vibe-Coding App with Agent Toolkit for AWS
·2026.11.11 10:05
Key point
Applying rule files allowed the agent to automatically reflect security settings, resulting in a deployment costing $0.95 per month.
Details
- Agent Toolkit for AWS is a tool that ensures agents follow the latest AWS best practices and log actions to CloudTrail through MCP servers, skills, and rule files
- A comparison before and after applying rule files showed that without them, S3 security and IAM least privilege were missing, but with them, security settings such as presigned URLs, OAC, and ARN references were automatically applied
- The process from vibe-coding to deployment completion took approximately 1 hour, and about 1 hour and 30 minutes including testing, with an estimated monthly cost of $0.95
- Using the aws:ViaAWSMCPService condition key allows restricting permissions to block only write operations via MCP while permitting direct CLI calls
Practice Environment and Cautions
- The practice was performed using Claude Code and AWS CLI 2.35.0 or higher in the Seoul region (ap-northeast-2)
- The aws configure agent-toolkit command works only in the us-east-1 region, and the MCP endpoint does not support Seoul
- Direct verification after deployment is essential, and applying rule files prompts the agent to recommend the use of external authentication services such as Cognito
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