lib/constructs/bedrock-agent.ts

@@ -249,7 +249,9 @@ Keep responses concise, professional, and actionable.`;
     guardrailVersion.addDependency(guardrail);
 
     agentRole.addToPolicy(new iam.PolicyStatement({
-      actions: ['bedrock:ApplyGuardrail'],
+      // GetGuardrail: the Agents service fetches the guardrail config before applying it —
+      // without it every InvokeAgent logs an AccessDenied (trips CIS 4.1 alarm)
+      actions: ['bedrock:ApplyGuardrail', 'bedrock:GetGuardrail'],
       // Base ARN plus version-suffixed children — runtime applies the versioned guardrail
       resources: [guardrail.attrGuardrailArn, `${guardrail.attrGuardrailArn}/*`],
     }));