diff --git a/SVSim.BattleNode/Lifecycle/ScriptedLifecycle.cs b/SVSim.BattleNode/Lifecycle/ScriptedLifecycle.cs
index fde884b..4703a51 100644
--- a/SVSim.BattleNode/Lifecycle/ScriptedLifecycle.cs
+++ b/SVSim.BattleNode/Lifecycle/ScriptedLifecycle.cs
@@ -113,11 +113,17 @@ public static class ScriptedLifecycle
         EnvelopeForPush(NetworkBattleUri.Swap,
             new SwapResponseBody(Self: BuildPosIdxList(hand)));
 
-    public static MsgEnvelope BuildReady(IReadOnlyList<long> hand) =>
+    /// <summary>Non-interactive opponent (scripted single / AINetwork): oppo is the
+    /// placeholder <see cref="InitialHand"/> (v1 behaviour).</summary>
+    public static MsgEnvelope BuildReady(IReadOnlyList<long> hand) => BuildReady(hand, InitialHand);
+
+    /// <summary>Both hands known (the mulligan barrier supplies the opponent's
+    /// post-mulligan hand).</summary>
+    public static MsgEnvelope BuildReady(IReadOnlyList<long> selfHand, IReadOnlyList<long> oppoHand) =>
         EnvelopeForPush(NetworkBattleUri.Ready,
             new ReadyBody(
-                Self: BuildPosIdxList(hand),
-                Oppo: BuildPosIdxList(InitialHand),
+                Self: BuildPosIdxList(selfHand),
+                Oppo: BuildPosIdxList(oppoHand),
                 IdxChangeSeed: ScriptedProfiles.ReadyIdxChangeSeed,
                 Spin: ScriptedProfiles.ReadySpin));
 
diff --git a/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs b/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs
index 730de6d..3e62653 100644
--- a/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs
+++ b/SVSim.UnitTests/BattleNode/Lifecycle/ScriptedLifecycleTests.cs
@@ -145,6 +145,27 @@ public class ScriptedLifecycleTests
         Assert.That(body.Self[1].Idx, Is.EqualTo(4));
     }
 
+    [Test]
+    public void BuildReady_two_arg_sets_oppo_to_supplied_hand()
+    {
+        var env = ScriptedLifecycle.BuildReady(new long[] { 1, 4, 3 }, new long[] { 1, 2, 6 });
+        var body = (ReadyBody)env.Body;
+
+        Assert.That(body.Self.Select(p => p.Idx), Is.EqualTo(new[] { 1, 4, 3 }));
+        Assert.That(body.Oppo.Select(p => p.Idx), Is.EqualTo(new[] { 1, 2, 6 }),
+            "oppo must reflect the opponent's post-mulligan hand, not the placeholder InitialHand.");
+    }
+
+    [Test]
+    public void BuildReady_one_arg_defaults_oppo_to_InitialHand()
+    {
+        var env = ScriptedLifecycle.BuildReady(new long[] { 1, 4, 3 });
+        var body = (ReadyBody)env.Body;
+
+        Assert.That(body.Oppo.Select(p => p.Idx), Is.EqualTo(new[] { 1, 2, 3 }),
+            "single-arg overload (non-interactive opponent) keeps the placeholder hand.");
+    }
+
     [Test]
     public void BuildOpponentTurnStart_HasUriTurnStartAndSpin()
     {