What happened
AWS published a detailed technical post on June 1 describing two complementary controls in Amazon Bedrock AgentCore Gateway: Cedar-based Policy for deterministic allow/deny access decisions on every tool call (evaluated against principal, action, resource, and conditions), and Lambda Interceptors for dynamic request/response validation, payload enrichment, and response filtering before or after each tool invocation. AWS also extended AgentCore MCP support with dynamic listing, streaming, OAuth 2.0 on-behalf-of token exchange, and AWS PrivateLink for private connectivity.
Why it matters
These controls directly address the core agentic security problem: LLM agents decide tool selection and arguments at runtime, making static call-graph auditing impossible. Cedar-based Policy enforces deterministic deny at the gateway before tools execute; Lambda Interceptors provide a programmable hook for dynamic validation (e.g., geography-based access control that requires both JWT validation and policy evaluation). Combined, they shift agentic authorization from model-level intent to infrastructure-level enforcement—the right architectural pattern.
Applicability
Enterprise teams deploying multi-agent workflows on AWS should immediately review AgentCore Gateway Policy and Interceptor capabilities as the baseline control model. Consulting teams advising AWS customers on agentic deployments should use the lakehouse data agent reference architecture as a pattern for role-to-tool mapping, tenant scoping, and audit logging.