diff --git a/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs b/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs
index 2387f30..de8707a 100644
--- a/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs
+++ b/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs
@@ -17,6 +17,10 @@ public class ScriptedLifecycleTests
         Assert.That(selfInfo["oppoId"], Is.EqualTo(847666884L));
         var oppoInfo = (Dictionary<string, object?>)env.Body["oppoInfo"]!;
         Assert.That(oppoInfo["oppoId"], Is.EqualTo(906243102L));
+
+        // Bid travels in the envelope, not the Body — protect against the Task 5 reserved-keys regression.
+        Assert.That(env.Bid, Is.EqualTo("b"));
+        Assert.That(env.Body.ContainsKey("bid"), Is.False);
     }
 
     [Test]