Enforce least-privilege authorization in multi-agent AI chains using Cedar

This post presents a reference implementation and deployment walkthrough for enforcing authorization in multi-agent AI systems using a three-layer Cedar policy model (agent-to-tool, agent-to-agent delegation, and originating-user authorization), combined with OIDC/OAuth authentication, HMAC-SHA256 context signing, and AWS services (Lambda, Verified Permissions, Cognito, API Gateway, CloudWatch). It covers schema and policy definitions, architecture and processing flow, test scenarios, monitoring/audit mapping to NIST controls, and operational guidance for production and multi-account deployments.