diff --git a/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap b/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap
index c97e8e032..bf1d715db 100644
--- a/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap
+++ b/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap
@@ -356,10 +356,12 @@ export class AgentCoreStack extends Stack {
     const { spec, mcpSpec, credentials, harnesses } = props;
 
     // Create AgentCoreApplication with all agents and harness roles
-    this.application = new AgentCoreApplication(this, 'Application', {
-      spec,
-      harnesses: harnesses?.length ? harnesses : undefined,
-    });
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const appProps: Record<string, unknown> = { spec };
+    if (harnesses?.length) {
+      appProps.harnesses = harnesses;
+    }
+    this.application = new AgentCoreApplication(this, 'Application', appProps as any);
 
     // Create AgentCoreMcp if there are gateways configured
     if (mcpSpec?.agentCoreGateways && mcpSpec.agentCoreGateways.length > 0) {
diff --git a/src/assets/cdk/lib/cdk-stack.ts b/src/assets/cdk/lib/cdk-stack.ts
index a89efc850..a823b4433 100644
--- a/src/assets/cdk/lib/cdk-stack.ts
+++ b/src/assets/cdk/lib/cdk-stack.ts
@@ -58,10 +58,12 @@ export class AgentCoreStack extends Stack {
     const { spec, mcpSpec, credentials, harnesses } = props;
 
     // Create AgentCoreApplication with all agents and harness roles
-    this.application = new AgentCoreApplication(this, 'Application', {
-      spec,
-      harnesses: harnesses?.length ? harnesses : undefined,
-    });
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const appProps: Record<string, unknown> = { spec };
+    if (harnesses?.length) {
+      appProps.harnesses = harnesses;
+    }
+    this.application = new AgentCoreApplication(this, 'Application', appProps as any);
 
     // Create AgentCoreMcp if there are gateways configured
     if (mcpSpec?.agentCoreGateways && mcpSpec.agentCoreGateways.length > 0) {