diff --git a/docs/plans/2026-08-05-mtconnect-writeback.md.tasks.json b/docs/plans/2026-08-05-mtconnect-writeback.md.tasks.json
index cf23733a..17c9832a 100644
--- a/docs/plans/2026-08-05-mtconnect-writeback.md.tasks.json
+++ b/docs/plans/2026-08-05-mtconnect-writeback.md.tasks.json
@@ -1,12 +1,12 @@
 {
   "planPath": "docs/plans/2026-08-05-mtconnect-writeback.md",
   "tasks": [
-    { "id": 0, "subject": "Task 0: Write options block (config + parse)", "status": "pending" },
-    { "id": 1, "subject": "Task 1: Agent-client write seam", "status": "pending" },
-    { "id": 2, "subject": "Task 2: MTConnectDriver IWritable + discovery stamping", "status": "pending", "blockedBy": [0, 1] },
-    { "id": 3, "subject": "Task 3: Integration fixture + write legs", "status": "pending", "blockedBy": [2] },
-    { "id": 4, "subject": "Task 4: Docs reconciliation (MTConnect + stale MQTT records)", "status": "pending", "blockedBy": [2] },
-    { "id": 5, "subject": "Task 5: Full-suite verification", "status": "pending", "blockedBy": [3, 4] },
+    { "id": 0, "subject": "Task 0: Write options block (config + parse)", "status": "completed" },
+    { "id": 1, "subject": "Task 1: Agent-client write seam", "status": "completed" },
+    { "id": 2, "subject": "Task 2: MTConnectDriver IWritable + discovery stamping", "status": "completed", "blockedBy": [0, 1] },
+    { "id": 3, "subject": "Task 3: Integration fixture + write legs", "status": "completed", "blockedBy": [2] },
+    { "id": 4, "subject": "Task 4: Docs reconciliation (MTConnect + stale MQTT records)", "status": "completed", "blockedBy": [2] },
+    { "id": 5, "subject": "Task 5: Full-suite verification", "status": "completed", "blockedBy": [3, 4] },
     { "id": 6, "subject": "Task 6: Live gate (main session, headless)", "status": "pending", "blockedBy": [5] }
   ],
   "lastUpdated": "2026-08-05T00:00:00Z"
diff --git a/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/DriverTypeNames.cs b/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/DriverTypeNames.cs
index b08039a4..5c03e45e 100644
--- a/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/DriverTypeNames.cs
+++ b/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/DriverTypeNames.cs
@@ -58,7 +58,8 @@ public static class DriverTypeNames
     /// <summary>MQTT / Sparkplug B broker-subscription driver.</summary>
     public const string Mqtt = "Mqtt";
 
-    /// <summary>MTConnect Agent driver — read-only HTTP/XML over an Agent's probe/current/sample surface.</summary>
+    /// <summary>MTConnect Agent driver — HTTP/XML over an Agent's probe/current/sample surface, plus
+    /// opt-in observation write-back via the Agent's AllowPut POST surface.</summary>
     public const string MTConnect = "MTConnect";
 
     /// <summary>
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/TagEditors/MTConnectTagConfigModel.cs b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/TagEditors/MTConnectTagConfigModel.cs
index 6f6d8096..30898795 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/TagEditors/MTConnectTagConfigModel.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/TagEditors/MTConnectTagConfigModel.cs
@@ -4,8 +4,8 @@ using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 namespace ZB.MOM.WW.OtOpcUa.AdminUI.Uns.TagEditors;
 
 /// <summary>Typed working model for an MTConnect tag's TagConfig JSON. The tag binds a single Agent
-/// <c>DataItem</c> by its <c>id</c> attribute (<see cref="FullName"/> — MTConnect is read-only, so
-/// there is no address encoding beyond the id); the remaining fields are probe-sourced display
+/// <c>DataItem</c> by its <c>id</c> attribute (<see cref="FullName"/> — reads and writes both address
+/// the DataItem by id, so there is no address encoding beyond it); the remaining fields are probe-sourced display
 /// metadata plus an author-settable type override. Preserves unrecognised JSON keys across a
 /// load→save.</summary>
 /// <remarks>