diff --git a/packages/core/src/agent/agent.ts b/packages/core/src/agent/agent.ts
index 800ca6f0e..a3aa23315 100644
--- a/packages/core/src/agent/agent.ts
+++ b/packages/core/src/agent/agent.ts
@@ -3794,6 +3794,12 @@ export class Agent {
   }
 
   private shouldPersistMemoryForContext(oc: OperationContext): boolean {
+    // Skip memory persistence for delegated sub-agent calls to prevent
+    // polluting the parent conversation's memory with duplicate messages.
+    // See: https://github.com/VoltAgent/voltagent/issues/1026
+    if (oc.parentAgentId) {
+      return false;
+    }
     return !this.isReadOnlyMemoryForContext(oc);
   }