diff --git a/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/InboundScriptHost.cs b/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/InboundScriptHost.cs
index 98212fbb..984425ae 100644
--- a/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/InboundScriptHost.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/InboundScriptHost.cs
@@ -28,6 +28,14 @@ public class InboundScriptHost
     /// </summary>
     public DatabaseAccessor Database { get; } = new();
 
+    /// <summary>
+    /// Leveled per-run logging. Editor mirror of
+    /// ZB.MOM.WW.ScadaBridge.InboundAPI.InboundScriptLogger (step logs design 2026-09-09 D4);
+    /// shares <see cref="SandboxLog"/> with the Test Run sandbox because only the signatures
+    /// matter here — analysis never invokes it.
+    /// </summary>
+    public SandboxLog Log { get; } = new();
+
     /// <summary>
     /// The cancellation token for the operation.
     /// </summary>
diff --git a/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/SandboxScriptHost.cs b/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/SandboxScriptHost.cs
index 9153edab..cce4cda0 100644
--- a/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/SandboxScriptHost.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.CentralUI/ScriptAnalysis/SandboxScriptHost.cs
@@ -91,9 +91,11 @@ public class SandboxScriptHost
     /// <summary>
     /// Sandbox mirror of the site runtime's <c>Log</c> global (step logs design 2026-09-09 D4).
     /// Present so a script that logs BINDS in the Test Run editor; lines go to the Test Run
-    /// console pane and are never audited.
+    /// console pane and are never audited. Delegates to <see cref="SandboxInstanceContext.Log"/>
+    /// exactly as the runtime's <c>ScriptGlobals.Log =&gt; Instance.Log</c> does, so
+    /// <c>Log</c> and <c>Instance.Log</c> are the same object here too.
     /// </summary>
-    public SandboxLog Log { get; } = new();
+    public SandboxLog Log => Instance.Log;
 }
 
 /// <summary>
diff --git a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/ScriptAnalysis/ScriptAnalysisServiceTests.cs b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/ScriptAnalysis/ScriptAnalysisServiceTests.cs
index 257aba65..9601c2e4 100644
--- a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/ScriptAnalysis/ScriptAnalysisServiceTests.cs
+++ b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/ScriptAnalysis/ScriptAnalysisServiceTests.cs
@@ -695,6 +695,40 @@ public class ScriptAnalysisServiceTests
         Assert.DoesNotContain(resp.Markers, m => m.Code.StartsWith("SCADA"));
     }
 
+    [Fact]
+    public void InboundScript_Log_DiagnosesClean()
+    {
+        // Flow Debugger step logs (design 2026-09-09 D4): `Log` is a shipped inbound-script
+        // global (InboundScriptContext.Log). The EDITOR host is a third mirror alongside the
+        // compile surface and the Test Run sandbox — without `Log` on InboundScriptHost a
+        // logging method script shows a spurious CS0103 while deploying and running fine.
+        var resp = _svc.Diagnose(new DiagnoseRequest(
+            Code: "Log.Info(\"x\");\n"
+                + "Log.Debug(\"d\");\n"
+                + "Log.Warn(\"w\", new System.Exception(\"boom\"));\n"
+                + "Log.Error(\"e\");",
+            Kind: ScriptKind.InboundApi));
+
+        Assert.DoesNotContain(resp.Markers, m => m.Code.StartsWith("CS"));
+        Assert.DoesNotContain(resp.Markers, m => m.Code.StartsWith("SCADA"));
+    }
+
+    [Fact]
+    public void SiteScript_Log_DiagnosesClean()
+    {
+        // The other half of GlobalsTypeFor: every non-inbound kind analyses against
+        // SandboxScriptHost, so the same `Log` global must resolve there too — both at
+        // the top level and via `Instance.Log`.
+        var resp = _svc.Diagnose(new DiagnoseRequest(
+            Code: "Log.Info(\"x\");\n"
+                + "Log.Warn(\"w\", new System.Exception(\"boom\"));\n"
+                + "Instance.Log.Info(\"via instance\");",
+            Kind: ScriptKind.Template));
+
+        Assert.DoesNotContain(resp.Markers, m => m.Code.StartsWith("CS"));
+        Assert.DoesNotContain(resp.Markers, m => m.Code.StartsWith("SCADA"));
+    }
+
     [Fact]
     public void InboundScript_Database_DiagnosesClean()
     {
diff --git a/tests/ZB.MOM.WW.ScadaBridge.ScriptAnalysis.Tests/RoslynScriptCompilerTests.cs b/tests/ZB.MOM.WW.ScadaBridge.ScriptAnalysis.Tests/RoslynScriptCompilerTests.cs
index 7ca28a7b..ff4deb26 100644
--- a/tests/ZB.MOM.WW.ScadaBridge.ScriptAnalysis.Tests/RoslynScriptCompilerTests.cs
+++ b/tests/ZB.MOM.WW.ScadaBridge.ScriptAnalysis.Tests/RoslynScriptCompilerTests.cs
@@ -140,7 +140,7 @@ public class RoslynScriptCompilerTests
     }
 
     [Fact]
-    public void Compile_Empty_ForTheLogGlobal()
+    public void CompilesCleanly_ForTheLogGlobal()
     {
         // Flow Debugger step logs (design 2026-09-09 D4): `Log` is a script-reachable
         // global on the runtime ScriptGlobals AND on ScriptRuntimeContext, so both the