diff --git a/packages/sdk-typescript/src/daemon/acpRouteTable.ts b/packages/sdk-typescript/src/daemon/acpRouteTable.ts
index f29cd5e408a..032dbeefb7d 100644
--- a/packages/sdk-typescript/src/daemon/acpRouteTable.ts
+++ b/packages/sdk-typescript/src/daemon/acpRouteTable.ts
@@ -12,10 +12,19 @@
 // prevents route inconsistencies between the two transport variants.
 // ---------------------------------------------------------------------------
 
-import { isRecord } from './acpTransportUtils.js';
-
 const REQUESTED_SESSION_ID_META_KEY = 'qwen-code/sessionId';
 
+// Kept local (instead of reusing `isRecord` from `acpTransportUtils.ts`):
+// acpTransportUtils imports this module's ROUTE_TABLE, so re-importing the
+// predicate from there would silently restore the
+// acpRouteTable -> acpTransportUtils -> acpRouteTable runtime cycle this
+// change exists to break. ESM cycles compile and test green, so the guard is
+// this comment — do not consolidate without breaking the cycle some other
+// way first.
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
+
 export interface RouteMapping {
   method: string;
   /**