diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/OpcUa/OpcUaPublishActor.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/OpcUa/OpcUaPublishActor.cs
index 9f005cc1..3d8a735c 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/OpcUa/OpcUaPublishActor.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/OpcUa/OpcUaPublishActor.cs
@@ -209,7 +209,9 @@ public sealed class OpcUaPublishActor : ReceiveActor
             var artifact = msg.DeploymentId is { } depId
                 ? LoadArtifact(depId)
                 : LoadLatestArtifact();
-            var composition = DeploymentArtifact.ParseComposition(artifact);
+            var composition = _localNode is { } ln
+                ? DeploymentArtifact.ParseComposition(artifact, ln.Value)
+                : DeploymentArtifact.ParseComposition(artifact);
             var plan = Phase7Planner.Compute(_lastApplied, composition);
 
             if (plan.IsEmpty)
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/OpcUa/OpcUaPublishActorRebuildTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/OpcUa/OpcUaPublishActorRebuildTests.cs
index 618c1672..1a9760d7 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/OpcUa/OpcUaPublishActorRebuildTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/OpcUa/OpcUaPublishActorRebuildTests.cs
@@ -98,6 +98,104 @@ public sealed class OpcUaPublishActorRebuildTests : RuntimeActorTestBase
         AwaitAssert(() => sink.RebuildCalls.ShouldBe(1), duration: TimeSpan.FromMilliseconds(500));
     }
 
+    /// <summary>
+    ///     Wiring proof for per-ClusterId scoping (Task 4): a multi-cluster artifact must
+    ///     materialise ONLY the local node's cluster slice. Mirrors the multi-cluster artifact
+    ///     shape exercised in <c>DeploymentArtifactTests</c> (MAIN + SITE-A, one Galaxy driver +
+    ///     one SystemPlatform tag each). The scoped rebuild for the SITE-A node must surface the
+    ///     SITE-A tag (<c>t-sa</c> → variable <c>F.S1</c>) and NOT MAIN's (<c>t-main</c> →
+    ///     <c>F.M1</c>); the mirror holds for the MAIN node. Without the production scoping edit,
+    ///     the unscoped parse would materialise BOTH variables on every node.
+    /// </summary>
+    [Fact]
+    public void Rebuild_materialises_only_the_nodes_cluster()
+    {
+        // --- SITE-A node: only the SITE-A tag's variable, never MAIN's. ---
+        var dbA = NewInMemoryDbFactory();
+        var sinkA = new RecordingSink();
+        var applierA = new Phase7Applier(sinkA, NullLogger<Phase7Applier>.Instance);
+        SeedMultiClusterDeployment(dbA);
+
+        var siteActor = Sys.ActorOf(OpcUaPublishActor.PropsForTests(
+            sink: sinkA,
+            dbFactory: dbA,
+            applier: applierA,
+            localNode: NodeId.Parse("site-a-1:4053")));
+
+        siteActor.Tell(new OpcUaPublishActor.RebuildAddressSpace(CorrelationId.NewId()));
+
+        AwaitAssert(() => sinkA.RebuildCalls.ShouldBe(1), duration: TimeSpan.FromSeconds(2));
+        // t-sa (Name "S1", FolderPath "F") → MxAccessRef "F.S1" → variable node "F.S1".
+        sinkA.Calls.ShouldContain("EV:F.S1");
+        // t-main (MAIN cluster) must NOT leak onto the SITE-A node.
+        sinkA.Calls.ShouldNotContain("EV:F.M1");
+
+        // --- MAIN node: the mirror — only MAIN's tag's variable, never SITE-A's. ---
+        var dbM = NewInMemoryDbFactory();
+        var sinkM = new RecordingSink();
+        var applierM = new Phase7Applier(sinkM, NullLogger<Phase7Applier>.Instance);
+        SeedMultiClusterDeployment(dbM);
+
+        var mainActor = Sys.ActorOf(OpcUaPublishActor.PropsForTests(
+            sink: sinkM,
+            dbFactory: dbM,
+            applier: applierM,
+            localNode: NodeId.Parse("central-1:4053")));
+
+        mainActor.Tell(new OpcUaPublishActor.RebuildAddressSpace(CorrelationId.NewId()));
+
+        AwaitAssert(() => sinkM.RebuildCalls.ShouldBe(1), duration: TimeSpan.FromSeconds(2));
+        sinkM.Calls.ShouldContain("EV:F.M1");
+        sinkM.Calls.ShouldNotContain("EV:F.S1");
+    }
+
+    /// <summary>
+    ///     Seal a 2-cluster deployment (MAIN + SITE-A) whose artifact mirrors the multi-cluster
+    ///     shape the composer emits: a <c>Clusters</c> + <c>Nodes</c> map, one SystemPlatform
+    ///     namespace + Galaxy driver + Galaxy tag per cluster. Used by
+    ///     <see cref="Rebuild_materialises_only_the_nodes_cluster"/>.
+    /// </summary>
+    private static void SeedMultiClusterDeployment(IDbContextFactory<OtOpcUaConfigDbContext> dbFactory)
+    {
+        var artifact = JsonSerializer.SerializeToUtf8Bytes(new
+        {
+            Clusters = new[] { new { ClusterId = "MAIN" }, new { ClusterId = "SITE-A" } },
+            Nodes = new[]
+            {
+                new { NodeId = "central-1:4053", ClusterId = "MAIN" },
+                new { NodeId = "site-a-1:4053", ClusterId = "SITE-A" },
+            },
+            DriverInstances = new[]
+            {
+                new { DriverInstanceId = "main-galaxy", DriverType = "GalaxyMxGateway", DriverConfig = "{}", ClusterId = "MAIN",   NamespaceId = "main-ns" },
+                new { DriverInstanceId = "sa-galaxy",   DriverType = "GalaxyMxGateway", DriverConfig = "{}", ClusterId = "SITE-A", NamespaceId = "sa-ns" },
+            },
+            Namespaces = new[]
+            {
+                new { NamespaceId = "main-ns", ClusterId = "MAIN",   Kind = 1 }, // NamespaceKind.SystemPlatform
+                new { NamespaceId = "sa-ns",   ClusterId = "SITE-A", Kind = 1 },
+            },
+            Tags = new[]
+            {
+                new { TagId = "t-main", DriverInstanceId = "main-galaxy", EquipmentId = (string?)null, Name = "M1", FolderPath = "F", DataType = "Boolean", TagConfig = "{}" },
+                new { TagId = "t-sa",   DriverInstanceId = "sa-galaxy",   EquipmentId = (string?)null, Name = "S1", FolderPath = "F", DataType = "Boolean", TagConfig = "{}" },
+            },
+            ScriptedAlarms = Array.Empty<object>(),
+        });
+
+        using var ctx = dbFactory.CreateDbContext();
+        ctx.Deployments.Add(new Deployment
+        {
+            DeploymentId = Guid.NewGuid(),
+            RevisionHash = new string('b', 64),
+            Status = DeploymentStatus.Sealed,
+            CreatedBy = "test",
+            SealedAtUtc = DateTime.UtcNow,
+            ArtifactBlob = artifact,
+        });
+        ctx.SaveChanges();
+    }
+
     private static void SeedDeployment(
         IDbContextFactory<OtOpcUaConfigDbContext> dbFactory,
         string[] equipmentIds,