diff --git a/src/AcDream.Core/Items/ClientObject.cs b/src/AcDream.Core/Items/ClientObject.cs
index 773c1c4e..04d9c873 100644
--- a/src/AcDream.Core/Items/ClientObject.cs
+++ b/src/AcDream.Core/Items/ClientObject.cs
@@ -127,7 +127,7 @@ public sealed class PropertyBundle
 public sealed class ClientObject
 {
     public uint ObjectId      { get; init; }
-    public uint WeenieClassId { get; init; }   // "blueprint"
+    public uint WeenieClassId { get; set; }    // "blueprint"
     public string Name         { get; set; } = "";
     public ItemType Type      { get; set; }
     public EquipMask ValidLocations { get; set; }
@@ -150,9 +150,49 @@ public sealed class ClientObject
     public int  ContainerSlot { get; set; } = -1;
     public bool Attuned       { get; set; }
     public bool Bonded        { get; set; }
+    public uint WielderId    { get; set; }    // PropertyInstanceId.Wielder; 0 = not wielded
+    public int  ItemsCapacity     { get; set; }   // main-pack slots (containers)
+    public int  ContainersCapacity{ get; set; }   // side-pack slots (containers)
+    public uint Priority     { get; set; }    // ClothingPriority / CoverageMask layer order
+    public int  Structure    { get; set; }    // charges/uses remaining
+    public int  MaxStructure { get; set; }
+    public float Workmanship { get; set; }    // 0..10 (fractional on the wire)
     public PropertyBundle Properties { get; } = new();
 }
 
+/// <summary>
+/// The wire-delivered patch from a <c>CreateObject</c> (0xF745). Nullable fields
+/// were gated by a WeenieHeader flag that was ABSENT — the merge upsert
+/// (ClientObjectTable.Ingest) leaves the existing value untouched
+/// for those, matching retail's <c>SetWeenieDesc</c> (patches only present fields).
+/// Non-nullable id/effect fields use 0 = "not sent". Effects is assigned
+/// unconditionally (0 clears) — the D.5.2 icon contract. Quantity fields are
+/// int? (ACE PropertyInt convention); id/mask fields are uint?.
+/// </summary>
+public readonly record struct WeenieData(
+    uint Guid,
+    string? Name,
+    ItemType? Type,
+    uint WeenieClassId,
+    uint IconId,
+    uint IconOverlayId,
+    uint IconUnderlayId,
+    uint Effects,
+    int? Value,
+    int? StackSize,
+    int? StackSizeMax,
+    int? Burden,
+    uint? ContainerId,
+    uint? WielderId,
+    uint? ValidLocations,
+    uint? CurrentWieldedLocation,
+    uint? Priority,
+    int? ItemsCapacity,
+    int? ContainersCapacity,
+    int? Structure,
+    int? MaxStructure,
+    float? Workmanship);
+
 /// <summary>
 /// Container = inventory pack. Hierarchy is strictly 2-deep: character
 /// → side packs; a side pack cannot hold another side pack (r06 §7).
diff --git a/tests/AcDream.Core.Tests/Items/ClientObjectTableTests.cs b/tests/AcDream.Core.Tests/Items/ClientObjectTableTests.cs
index e11de2b4..a975d327 100644
--- a/tests/AcDream.Core.Tests/Items/ClientObjectTableTests.cs
+++ b/tests/AcDream.Core.Tests/Items/ClientObjectTableTests.cs
@@ -198,4 +198,36 @@ public sealed class ClientObjectTableTests
         Assert.True(ok);
         Assert.Equal(0u, repo.Get(0x500000ADu)!.Effects);
     }
+
+    [Fact]
+    public void ClientObject_NewFields_DefaultAndSettable()
+    {
+        var o = new ClientObject
+        {
+            ObjectId = 1, WielderId = 0x42u, ItemsCapacity = 24, ContainersCapacity = 7,
+            Priority = 8u, Structure = 5, MaxStructure = 10, Workmanship = 7.5f,
+        };
+        o.WeenieClassId = 0xABCDu;   // now settable
+        Assert.Equal(0x42u, o.WielderId);
+        Assert.Equal(24, o.ItemsCapacity);
+        Assert.Equal(7, o.ContainersCapacity);
+        Assert.Equal(8u, o.Priority);
+        Assert.Equal(5, o.Structure);
+        Assert.Equal(10, o.MaxStructure);
+        Assert.Equal(7.5f, o.Workmanship);
+        Assert.Equal(0xABCDu, o.WeenieClassId);
+    }
+
+    [Fact]
+    public void WeenieData_Construct()
+    {
+        var d = new WeenieData(Guid: 1, Name: "x", Type: ItemType.Misc, WeenieClassId: 2,
+            IconId: 0x06001234u, IconOverlayId: 0, IconUnderlayId: 0, Effects: 0,
+            Value: 5, StackSize: 1, StackSizeMax: 1, Burden: 10,
+            ContainerId: 0x99u, WielderId: null, ValidLocations: null,
+            CurrentWieldedLocation: null, Priority: null,
+            ItemsCapacity: null, ContainersCapacity: null,
+            Structure: null, MaxStructure: null, Workmanship: null);
+        Assert.Equal(0x99u, d.ContainerId);
+    }
 }