diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DeploymentArtifactAliasParityTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DeploymentArtifactAliasParityTests.cs
index 61bafad2..feb93c79 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DeploymentArtifactAliasParityTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DeploymentArtifactAliasParityTests.cs
@@ -1,6 +1,10 @@
+using System.Linq;
 using System.Text.Json;
 using Shouldly;
 using Xunit;
+using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
+using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
+using ZB.MOM.WW.OtOpcUa.OpcUaServer;
 using ZB.MOM.WW.OtOpcUa.Runtime.Drivers;
 
 namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Drivers;
@@ -96,4 +100,164 @@ public sealed class DeploymentArtifactAliasParityTests
 
         c.EquipmentTags.ShouldBeEmpty();
     }
+
+    /// <summary>
+    ///     The load-bearing direct byte-parity proof for the two equipment-tag producers: for the SAME
+    ///     input draft, the live-edit composer (<see cref="Phase7Composer.Compose"/>) and the
+    ///     artifact decoder (<see cref="DeploymentArtifact.ParseComposition(System.ReadOnlySpan{byte})"/>)
+    ///     must emit IDENTICAL <c>EquipmentTags</c> — element-wise equal on every field
+    ///     (TagId, EquipmentId, DriverInstanceId, FolderPath, Name, DataType, FullName) AND in the same
+    ///     ORDER. The draft holds a Galaxy equipment tag (EquipmentId set, GalaxyMxGateway driver in an
+    ///     Equipment-kind namespace, TagConfig <c>{"FullName":"DelmiaReceiver_001.DownloadPath"}</c>)
+    ///     PLUS a Modbus equipment tag, so the parity is proven both for Galaxy specifically and across
+    ///     drivers — Galaxy is now an ordinary Equipment-kind driver with no exception clause on either
+    ///     side. Both sides sort by EquipmentId → FolderPath → Name (Ordinal), so identical input yields
+    ///     identical order. <c>EquipmentTagPlan</c> is a plain positional record (all string members), so
+    ///     <c>SequenceEqual</c> is full value-and-order equality.
+    /// </summary>
+    [Fact]
+    public void Composer_and_artifact_agree_on_galaxy_equipment_tag()
+    {
+        // ---- The ONE input draft both producers consume ----
+        // Equipment-kind namespace shared by both drivers (the qualifying gate on both sides).
+        var ns = new Namespace
+        {
+            NamespaceId = "ns-eq",
+            ClusterId = "c1",
+            Kind = NamespaceKind.Equipment,
+            NamespaceUri = "urn:eq",
+        };
+        // Galaxy is a standard Equipment-kind driver now — no driver-type exception on either side.
+        var galaxyDriver = new DriverInstance
+        {
+            DriverInstanceId = "drv-galaxy",
+            ClusterId = "c1",
+            NamespaceId = "ns-eq",
+            Name = "Galaxy1",
+            DriverType = "GalaxyMxGateway",
+            DriverConfig = "{}",
+        };
+        var modbusDriver = new DriverInstance
+        {
+            DriverInstanceId = "drv-modbus",
+            ClusterId = "c1",
+            NamespaceId = "ns-eq",
+            Name = "Modbus1",
+            DriverType = "Modbus",
+            DriverConfig = "{}",
+        };
+        var area = new UnsArea { UnsAreaId = "area-1", ClusterId = "c1", Name = "filling" };
+        var line = new UnsLine { UnsLineId = "line-1", UnsAreaId = "area-1", Name = "line-1" };
+        var galaxyEquip = new Equipment
+        {
+            EquipmentId = "eq-galaxy",
+            DriverInstanceId = "drv-galaxy",
+            UnsLineId = "line-1",
+            Name = "DelmiaReceiver",
+            MachineCode = "DELMIARECEIVER",
+        };
+        var modbusEquip = new Equipment
+        {
+            EquipmentId = "eq-modbus",
+            DriverInstanceId = "drv-modbus",
+            UnsLineId = "line-1",
+            Name = "FillingPump",
+            MachineCode = "FILLINGPUMP",
+        };
+
+        // The Galaxy equipment tag — FullName is the Galaxy ref "tag_name.AttributeName".
+        var galaxyTag = new Tag
+        {
+            TagId = "tag-galaxy",
+            DriverInstanceId = "drv-galaxy",
+            EquipmentId = "eq-galaxy",
+            FolderPath = null, // coalesces to "" on both sides
+            Name = "DownloadPath",
+            DataType = "String",
+            AccessLevel = TagAccessLevel.Read,
+            TagConfig = "{\"FullName\":\"DelmiaReceiver_001.DownloadPath\"}",
+        };
+        // A non-Galaxy (Modbus) equipment tag — proves the parity holds across drivers, not just Galaxy.
+        var modbusTag = new Tag
+        {
+            TagId = "tag-modbus",
+            DriverInstanceId = "drv-modbus",
+            EquipmentId = "eq-modbus",
+            FolderPath = "registers",
+            Name = "Speed",
+            DataType = "Float",
+            AccessLevel = TagAccessLevel.ReadWrite,
+            TagConfig = "{\"FullName\":\"40001\"}",
+        };
+
+        var areas = new[] { area };
+        var lines = new[] { line };
+        var equipment = new[] { galaxyEquip, modbusEquip };
+        var drivers = new[] { galaxyDriver, modbusDriver };
+        var tags = new[] { galaxyTag, modbusTag };
+        var namespaces = new[] { ns };
+
+        // ---- Side 1: the live-edit composer ----
+        var composed = Phase7Composer.Compose(
+            areas, lines, equipment, drivers, Array.Empty<ScriptedAlarm>(), tags, namespaces);
+
+        // ---- Side 2: serialise the SAME draft to the artifact blob shape ConfigComposer emits
+        //              (Pascal-case off the EF entities), then decode it. ----
+        var blob = JsonSerializer.SerializeToUtf8Bytes(new
+        {
+            Namespaces = new[]
+            {
+                new { ns.NamespaceId, ns.ClusterId, Kind = (int)ns.Kind },
+            },
+            DriverInstances = new[]
+            {
+                new { galaxyDriver.DriverInstanceId, galaxyDriver.DriverType, galaxyDriver.DriverConfig, galaxyDriver.NamespaceId, galaxyDriver.ClusterId },
+                new { modbusDriver.DriverInstanceId, modbusDriver.DriverType, modbusDriver.DriverConfig, modbusDriver.NamespaceId, modbusDriver.ClusterId },
+            },
+            Tags = new[]
+            {
+                ToSnapshot(galaxyTag),
+                ToSnapshot(modbusTag),
+            },
+        });
+
+        var decoded = DeploymentArtifact.ParseComposition(blob);
+
+        // ---- The equality contract: element-wise equal on ALL fields + same order ----
+        decoded.EquipmentTags.Count.ShouldBe(2);
+        // SequenceEqual = full value-and-order equality (EquipmentTagPlan is a positional record).
+        decoded.EquipmentTags.SequenceEqual(composed.EquipmentTags).ShouldBeTrue();
+
+        // Spell the per-field contract out too (so a future divergence names the offending field
+        // rather than just "sequences differ"), and pin the Galaxy tag's wire-level FullName.
+        foreach (var (d, x) in decoded.EquipmentTags.Zip(composed.EquipmentTags))
+        {
+            d.TagId.ShouldBe(x.TagId);
+            d.EquipmentId.ShouldBe(x.EquipmentId);
+            d.DriverInstanceId.ShouldBe(x.DriverInstanceId);
+            d.FolderPath.ShouldBe(x.FolderPath);
+            d.Name.ShouldBe(x.Name);
+            d.DataType.ShouldBe(x.DataType);
+            d.FullName.ShouldBe(x.FullName);
+        }
+
+        var galaxyPlan = decoded.EquipmentTags.Single(t => t.TagId == "tag-galaxy");
+        galaxyPlan.FullName.ShouldBe("DelmiaReceiver_001.DownloadPath");
+        galaxyPlan.EquipmentId.ShouldBe("eq-galaxy");
+        galaxyPlan.DriverInstanceId.ShouldBe("drv-galaxy");
+        galaxyPlan.FolderPath.ShouldBe(string.Empty); // null FolderPath coalesced identically on both sides
+    }
+
+    /// <summary>The full Pascal-case snapshot a <see cref="Tag"/> EF entity serialises to in the
+    /// artifact (matches ConfigComposer): the equipment-tag decoder reads exactly these fields.</summary>
+    private static object ToSnapshot(Tag t) => new
+    {
+        t.TagId,
+        t.DriverInstanceId,
+        t.EquipmentId,
+        t.Name,
+        t.FolderPath,
+        t.DataType,
+        t.TagConfig,
+    };
 }