diff --git a/src/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting/ScriptLoggerFactory.cs b/src/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting/ScriptLoggerFactory.cs
index 604ece8e..f14b5103 100644
--- a/src/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting/ScriptLoggerFactory.cs
+++ b/src/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting/ScriptLoggerFactory.cs
@@ -61,4 +61,34 @@ public sealed class ScriptLoggerFactory
             throw new ArgumentException("Script name is required.", nameof(scriptName));
         return _rootLogger.ForContext(ScriptNameProperty, scriptName);
     }
+
+    /// <summary>
+    ///     Create a per-evaluation script logger bound with the supplied identity properties.
+    ///     <see cref="ScriptIdProperty"/> is always bound; <see cref="VirtualTagIdProperty"/>,
+    ///     <see cref="AlarmIdProperty"/>, and <see cref="EquipmentIdProperty"/> are bound only
+    ///     when the corresponding argument is non-null. Every event the returned logger emits
+    ///     carries these properties so the <see cref="ScriptLogTopicSink"/> can attribute each
+    ///     line on the Script-log page.
+    /// </summary>
+    /// <param name="scriptId">The Script row identifier; always bound. Required.</param>
+    /// <param name="virtualTagId">VirtualTag context, when the script runs against a virtual tag.</param>
+    /// <param name="alarmId">ScriptedAlarm context, when the script runs an alarm predicate.</param>
+    /// <param name="equipmentId">Equipment scope, for per-equipment script evaluations.</param>
+    /// <returns>An ILogger instance bound with the supplied identity properties.</returns>
+    /// <exception cref="ArgumentException">Thrown when <paramref name="scriptId"/> is null or whitespace.</exception>
+    public ILogger Create(
+        string scriptId,
+        string? virtualTagId = null,
+        string? alarmId = null,
+        string? equipmentId = null)
+    {
+        if (string.IsNullOrWhiteSpace(scriptId))
+            throw new ArgumentException("Script id is required.", nameof(scriptId));
+
+        var logger = _rootLogger.ForContext(ScriptIdProperty, scriptId);
+        if (virtualTagId is not null) logger = logger.ForContext(VirtualTagIdProperty, virtualTagId);
+        if (alarmId is not null) logger = logger.ForContext(AlarmIdProperty, alarmId);
+        if (equipmentId is not null) logger = logger.ForContext(EquipmentIdProperty, equipmentId);
+        return logger;
+    }
 }
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynScriptedAlarmEvaluator.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynScriptedAlarmEvaluator.cs
index 0b625f6f..8a247381 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynScriptedAlarmEvaluator.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynScriptedAlarmEvaluator.cs
@@ -5,7 +5,6 @@ using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 using ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms;
 using ZB.MOM.WW.OtOpcUa.Core.Scripting;
 using SerilogLogger = Serilog.ILogger;
-using SerilogLog = Serilog.Log;
 
 namespace ZB.MOM.WW.OtOpcUa.Host.Engines;
 
@@ -22,20 +21,24 @@ namespace ZB.MOM.WW.OtOpcUa.Host.Engines;
 /// </summary>
 public sealed class RoslynScriptedAlarmEvaluator : IScriptedAlarmEvaluator, IDisposable
 {
-    private static readonly SerilogLogger ScriptLogger = SerilogLog.ForContext<RoslynScriptedAlarmEvaluator>();
-
     private readonly ConcurrentDictionary<string, ScriptEvaluator<AlarmPredicateContext, bool>> _cache
         = new(StringComparer.Ordinal);
     private readonly ILogger<RoslynScriptedAlarmEvaluator> _logger;
+    private readonly SerilogLogger _scriptRoot;
     private readonly TimeSpan _runTimeout;
     private bool _disposed;
 
     /// <summary>Initializes a new instance of the Roslyn scripted alarm evaluator.</summary>
-    /// <param name="logger">Logger for diagnostic messages.</param>
+    /// <param name="logger">Logger for diagnostic messages (host diagnostics).</param>
+    /// <param name="scriptRoot">Root script logger; user <c>ctx.Logger.*</c> output flows through this to the Script-log page.</param>
     /// <param name="runTimeout">Optional timeout for script evaluation; defaults to 2 seconds.</param>
-    public RoslynScriptedAlarmEvaluator(ILogger<RoslynScriptedAlarmEvaluator> logger, TimeSpan? runTimeout = null)
+    public RoslynScriptedAlarmEvaluator(
+        ILogger<RoslynScriptedAlarmEvaluator> logger,
+        ScriptRootLogger scriptRoot,
+        TimeSpan? runTimeout = null)
     {
         _logger = logger;
+        _scriptRoot = (scriptRoot ?? throw new ArgumentNullException(nameof(scriptRoot))).Logger;
         _runTimeout = runTimeout ?? TimeSpan.FromSeconds(2);
     }
 
@@ -71,7 +74,12 @@ public sealed class RoslynScriptedAlarmEvaluator : IScriptedAlarmEvaluator, IDis
         }
 
         var readCache = BuildReadCache(dependencies);
-        var context = new AlarmPredicateContext(readCache, ScriptLogger);
+        // Per-evaluation script logger: bind both ScriptId and AlarmId from the alarm id so the
+        // Script-log page can attribute each line to the owning scripted alarm.
+        var scriptLog = _scriptRoot
+            .ForContext(ScriptLoggerFactory.ScriptIdProperty, alarmId)
+            .ForContext(ScriptLoggerFactory.AlarmIdProperty, alarmId);
+        var context = new AlarmPredicateContext(readCache, scriptLog);
 
         try
         {
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynVirtualTagEvaluator.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynVirtualTagEvaluator.cs
index 4ec0049e..3bf96df3 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynVirtualTagEvaluator.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Engines/RoslynVirtualTagEvaluator.cs
@@ -5,7 +5,6 @@ using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 using ZB.MOM.WW.OtOpcUa.Core.Scripting;
 using ZB.MOM.WW.OtOpcUa.Core.VirtualTags;
 using SerilogLogger = Serilog.ILogger;
-using SerilogLog = Serilog.Log;
 
 namespace ZB.MOM.WW.OtOpcUa.Host.Engines;
 
@@ -23,20 +22,24 @@ namespace ZB.MOM.WW.OtOpcUa.Host.Engines;
 /// </summary>
 public sealed class RoslynVirtualTagEvaluator : IVirtualTagEvaluator, IDisposable
 {
-    private static readonly SerilogLogger ScriptLogger = SerilogLog.ForContext<RoslynVirtualTagEvaluator>();
-
     private readonly ConcurrentDictionary<string, ScriptEvaluator<VirtualTagContext, object?>> _cache
         = new(StringComparer.Ordinal);
     private readonly ILogger<RoslynVirtualTagEvaluator> _logger;
+    private readonly SerilogLogger _scriptRoot;
     private readonly TimeSpan _runTimeout;
     private bool _disposed;
 
-    /// <summary>Initializes a new RoslynVirtualTagEvaluator with the given logger and optional timeout.</summary>
-    /// <param name="logger">Logger for recording compilation and execution errors.</param>
+    /// <summary>Initializes a new RoslynVirtualTagEvaluator with the given loggers and optional timeout.</summary>
+    /// <param name="logger">Logger for recording compilation and execution errors (host diagnostics).</param>
+    /// <param name="scriptRoot">Root script logger; user <c>ctx.Logger.*</c> output flows through this to the Script-log page.</param>
     /// <param name="runTimeout">Maximum execution time for each script; defaults to 2 seconds if not specified.</param>
-    public RoslynVirtualTagEvaluator(ILogger<RoslynVirtualTagEvaluator> logger, TimeSpan? runTimeout = null)
+    public RoslynVirtualTagEvaluator(
+        ILogger<RoslynVirtualTagEvaluator> logger,
+        ScriptRootLogger scriptRoot,
+        TimeSpan? runTimeout = null)
     {
         _logger = logger;
+        _scriptRoot = (scriptRoot ?? throw new ArgumentNullException(nameof(scriptRoot))).Logger;
         _runTimeout = runTimeout ?? TimeSpan.FromSeconds(2);
     }
 
@@ -84,12 +87,18 @@ public sealed class RoslynVirtualTagEvaluator : IVirtualTagEvaluator, IDisposabl
         }
 
         var readCache = BuildReadCache(dependencies);
+        // Per-evaluation script logger: bind both ScriptId and VirtualTagId from the virtual-tag id
+        // (in the live path the script id equals the virtual-tag id) so the Script-log page can
+        // attribute each line. EquipmentId stays unbound for now.
+        var scriptLog = _scriptRoot
+            .ForContext(ScriptLoggerFactory.ScriptIdProperty, virtualTagId)
+            .ForContext(ScriptLoggerFactory.VirtualTagIdProperty, virtualTagId);
         var context = new VirtualTagContext(
             readCache,
             setVirtualTag: (path, _) =>
                 _logger.LogDebug("VirtualTag {Id}: cross-tag write to {Path} dropped (single-tag adapter)",
                     virtualTagId, path),
-            logger: ScriptLogger);
+            logger: scriptLog);
 
         try
         {
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs
index 66a02c3b..1c0cd98f 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Host/Program.cs
@@ -109,13 +109,17 @@ if (hasDriver)
     // Replaces the F8-default NullVirtualTagEvaluator so VirtualTagActor evaluates real user
     // scripts at runtime.
     builder.Services.AddSingleton<RoslynVirtualTagEvaluator>(sp =>
-        new RoslynVirtualTagEvaluator(sp.GetRequiredService<ILoggerFactory>().CreateLogger<RoslynVirtualTagEvaluator>()));
+        new RoslynVirtualTagEvaluator(
+            sp.GetRequiredService<ILoggerFactory>().CreateLogger<RoslynVirtualTagEvaluator>(),
+            sp.GetRequiredService<ScriptRootLogger>()));
     builder.Services.AddSingleton<IVirtualTagEvaluator>(sp => sp.GetRequiredService<RoslynVirtualTagEvaluator>());
 
     // F9b — same pattern for scripted-alarm predicates. The actor preserves prior state on
     // any Failure result, so a misbehaving script can't flip Active/Inactive spuriously.
     builder.Services.AddSingleton<RoslynScriptedAlarmEvaluator>(sp =>
-        new RoslynScriptedAlarmEvaluator(sp.GetRequiredService<ILoggerFactory>().CreateLogger<RoslynScriptedAlarmEvaluator>()));
+        new RoslynScriptedAlarmEvaluator(
+            sp.GetRequiredService<ILoggerFactory>().CreateLogger<RoslynScriptedAlarmEvaluator>(),
+            sp.GetRequiredService<ScriptRootLogger>()));
     builder.Services.AddSingleton<IScriptedAlarmEvaluator>(sp => sp.GetRequiredService<RoslynScriptedAlarmEvaluator>());
 
     // Script-log fan-out (Layer 0). The DPS publisher resolves the ActorSystem lazily so it never
diff --git a/tests/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/ScriptLoggerFactoryTests.cs b/tests/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/ScriptLoggerFactoryTests.cs
index 7aeb727d..09a335e9 100644
--- a/tests/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/ScriptLoggerFactoryTests.cs
+++ b/tests/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/ScriptLoggerFactoryTests.cs
@@ -101,4 +101,64 @@ public sealed class ScriptLoggerFactoryTests
         // this exact string. If it changes, the filter breaks silently.
         ScriptLoggerFactory.ScriptNameProperty.ShouldBe("ScriptName");
     }
+
+    /// <summary>
+    ///     A logger from the identity overload, when written through a
+    ///     <see cref="ScriptLogTopicSink"/>, produces an entry carrying every bound id.
+    /// </summary>
+    [Fact]
+    public void Create_identity_overload_binds_ids_onto_published_entry()
+    {
+        var publisher = new FakePublisher();
+        var root = new LoggerConfiguration()
+            .MinimumLevel.Verbose()
+            .WriteTo.Sink(new ScriptLogTopicSink(publisher, LogEventLevel.Information))
+            .CreateLogger();
+        var factory = new ScriptLoggerFactory(root);
+
+        var logger = factory.Create(
+            scriptId: "S9", virtualTagId: "V9", alarmId: "A9", equipmentId: "EQ9");
+        logger.Information("typed identity");
+
+        publisher.Published.Count.ShouldBe(1);
+        var entry = publisher.Published[0];
+        entry.ScriptId.ShouldBe("S9");
+        entry.VirtualTagId.ShouldBe("V9");
+        entry.AlarmId.ShouldBe("A9");
+        entry.EquipmentId.ShouldBe("EQ9");
+        entry.Message.ShouldBe("typed identity");
+    }
+
+    /// <summary>
+    ///     The identity overload leaves optional ids unbound (null on the entry) when not
+    ///     supplied, binding only <c>ScriptId</c>.
+    /// </summary>
+    [Fact]
+    public void Create_identity_overload_leaves_optional_ids_null_when_absent()
+    {
+        var publisher = new FakePublisher();
+        var root = new LoggerConfiguration()
+            .MinimumLevel.Verbose()
+            .WriteTo.Sink(new ScriptLogTopicSink(publisher, LogEventLevel.Information))
+            .CreateLogger();
+        var factory = new ScriptLoggerFactory(root);
+
+        factory.Create(scriptId: "S10").Information("only script id");
+
+        var entry = publisher.Published[0];
+        entry.ScriptId.ShouldBe("S10");
+        entry.VirtualTagId.ShouldBeNull();
+        entry.AlarmId.ShouldBeNull();
+        entry.EquipmentId.ShouldBeNull();
+    }
+
+    /// <summary>Capturing publisher for the identity-overload sink tests.</summary>
+    private sealed class FakePublisher : IScriptLogPublisher
+    {
+        /// <summary>Gets the entries published so far.</summary>
+        public List<Commons.Messages.Logging.ScriptLogEntry> Published { get; } = [];
+
+        /// <inheritdoc/>
+        public void Publish(Commons.Messages.Logging.ScriptLogEntry entry) => Published.Add(entry);
+    }
 }
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynScriptedAlarmEvaluatorTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynScriptedAlarmEvaluatorTests.cs
index 228991ad..cce8a271 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynScriptedAlarmEvaluatorTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynScriptedAlarmEvaluatorTests.cs
@@ -1,6 +1,10 @@
 using Microsoft.Extensions.Logging.Abstractions;
+using Serilog;
+using Serilog.Events;
 using Shouldly;
 using Xunit;
+using ZB.MOM.WW.OtOpcUa.Commons.Messages.Logging;
+using ZB.MOM.WW.OtOpcUa.Core.Scripting;
 using ZB.MOM.WW.OtOpcUa.Host.Engines;
 
 namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;
@@ -13,11 +17,25 @@ namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;
 /// </summary>
 public sealed class RoslynScriptedAlarmEvaluatorTests
 {
+    /// <summary>Captures published <see cref="ScriptLogEntry"/> records for assertion.</summary>
+    private sealed class FakePublisher : IScriptLogPublisher
+    {
+        /// <summary>Gets the entries published so far.</summary>
+        public List<ScriptLogEntry> Published { get; } = [];
+
+        /// <inheritdoc/>
+        public void Publish(ScriptLogEntry entry) => Published.Add(entry);
+    }
+
+    /// <summary>Builds a no-op <see cref="ScriptRootLogger"/> for tests that don't assert on logging.</summary>
+    private static ScriptRootLogger NoOpScriptRoot() =>
+        new(new LoggerConfiguration().CreateLogger());
+
     /// <summary>Verifies evaluation of predicate returning true reports Active.</summary>
     [Fact]
     public void Evaluate_predicate_returning_true_reports_Active()
     {
-        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             alarmId: "alarm-hi",
@@ -32,7 +50,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
     [Fact]
     public void Evaluate_predicate_returning_false_reports_Inactive()
     {
-        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             alarmId: "alarm-hi",
@@ -47,7 +65,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
     [Fact]
     public void Evaluate_caches_compiled_predicate_across_calls()
     {
-        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
         const string predicate = "return (bool)ctx.GetTag(\"door_open\").Value;";
 
         var first = sut.Evaluate("alarm-door", predicate, new Dictionary<string, object?> { ["door_open"] = true });
@@ -61,7 +79,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
     [Fact]
     public void Evaluate_compile_error_returns_Failure()
     {
-        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate("alarm-bad", "this isn't C#;", new Dictionary<string, object?>());
 
@@ -73,7 +91,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
     [Fact]
     public void Evaluate_predicate_writing_virtual_tag_returns_Failure()
     {
-        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
 
         // AlarmPredicateContext.SetVirtualTag throws — wrapper catches + reports as Failure.
         var result = sut.Evaluate(
@@ -89,7 +107,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
     [Fact]
     public void Evaluate_empty_predicate_returns_Failure()
     {
-        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        using var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
 
         sut.Evaluate("alarm-empty", "", new Dictionary<string, object?>()).Success.ShouldBeFalse();
     }
@@ -98,7 +116,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
     [Fact]
     public void Evaluate_after_dispose_returns_Failure()
     {
-        var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance);
+        var sut = new RoslynScriptedAlarmEvaluator(NullLogger<RoslynScriptedAlarmEvaluator>.Instance, NoOpScriptRoot());
         sut.Dispose();
 
         var result = sut.Evaluate("alarm", "return true;", new Dictionary<string, object?>());
@@ -106,4 +124,36 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         result.Success.ShouldBeFalse();
         result.Reason!.ShouldContain("disposed");
     }
+
+    /// <summary>
+    /// A predicate's <c>ctx.Logger.Warning(...)</c> call flows through the injected root script
+    /// logger and out the <see cref="ScriptLogTopicSink"/>, producing one
+    /// <see cref="ScriptLogEntry"/> carrying the message, the bound <c>AlarmId</c>, and the
+    /// Warning level.
+    /// </summary>
+    [Fact]
+    public void Script_logger_call_publishes_entry_with_bound_alarm_identity()
+    {
+        var publisher = new FakePublisher();
+        var root = new LoggerConfiguration()
+            .MinimumLevel.Verbose()
+            .WriteTo.Sink(new ScriptLogTopicSink(publisher, LogEventLevel.Information))
+            .CreateLogger();
+        using var sut = new RoslynScriptedAlarmEvaluator(
+            NullLogger<RoslynScriptedAlarmEvaluator>.Instance, new ScriptRootLogger(root));
+
+        var result = sut.Evaluate(
+            alarmId: "alarm-log",
+            predicate: "ctx.Logger.Warning(\"alarm log\"); return true;",
+            dependencies: new Dictionary<string, object?>());
+
+        result.Success.ShouldBeTrue(result.Reason);
+        result.Active.ShouldBeTrue();
+        publisher.Published.Count.ShouldBe(1);
+        var entry = publisher.Published[0];
+        entry.Message.ShouldBe("alarm log");
+        entry.AlarmId.ShouldBe("alarm-log");
+        entry.ScriptId.ShouldBe("alarm-log");
+        entry.Level.ShouldBe("Warning");
+    }
 }
diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynVirtualTagEvaluatorTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynVirtualTagEvaluatorTests.cs
index 085cd771..064c0fa9 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynVirtualTagEvaluatorTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynVirtualTagEvaluatorTests.cs
@@ -1,8 +1,12 @@
 using System.Collections;
 using System.Reflection;
 using Microsoft.Extensions.Logging.Abstractions;
+using Serilog;
+using Serilog.Events;
 using Shouldly;
 using Xunit;
+using ZB.MOM.WW.OtOpcUa.Commons.Messages.Logging;
+using ZB.MOM.WW.OtOpcUa.Core.Scripting;
 using ZB.MOM.WW.OtOpcUa.Host.Engines;
 
 namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;
@@ -15,11 +19,25 @@ namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;
 /// </summary>
 public sealed class RoslynVirtualTagEvaluatorTests
 {
+    /// <summary>Captures published <see cref="ScriptLogEntry"/> records for assertion.</summary>
+    private sealed class FakePublisher : IScriptLogPublisher
+    {
+        /// <summary>Gets the entries published so far.</summary>
+        public List<ScriptLogEntry> Published { get; } = [];
+
+        /// <inheritdoc/>
+        public void Publish(ScriptLogEntry entry) => Published.Add(entry);
+    }
+
+    /// <summary>Builds a no-op <see cref="ScriptRootLogger"/> for tests that don't assert on logging.</summary>
+    private static ScriptRootLogger NoOpScriptRoot() =>
+        new(new LoggerConfiguration().CreateLogger());
+
     /// <summary>Verifies that simple addition expression is evaluated correctly.</summary>
     [Fact]
     public void Evaluate_simple_addition_returns_summed_value()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             virtualTagId: "vt-sum",
@@ -34,7 +52,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Evaluate_caches_compiled_expression_across_calls()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
         const string expr = "return (int)ctx.GetTag(\"x\").Value * 2;";
 
         var first = sut.Evaluate("vt-cache", expr, new Dictionary<string, object?> { ["x"] = 5 });
@@ -50,7 +68,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Evaluate_compile_error_returns_Failure_with_reason()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate("vt-bad", "this is not valid C#;", new Dictionary<string, object?>());
 
@@ -63,7 +81,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Evaluate_runtime_exception_returns_Failure_with_reason()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             virtualTagId: "vt-div0",
@@ -79,7 +97,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Evaluate_empty_expression_returns_Failure()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         sut.Evaluate("vt-empty", "", new Dictionary<string, object?>()).Success.ShouldBeFalse();
         sut.Evaluate("vt-empty", "   ", new Dictionary<string, object?>()).Success.ShouldBeFalse();
@@ -89,7 +107,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Evaluate_after_dispose_returns_Failure()
     {
-        var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
         sut.Dispose();
 
         var result = sut.Evaluate("vt", "return 1;", new Dictionary<string, object?>());
@@ -105,7 +123,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Passthrough_returns_dependency_value_without_compiling()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             virtualTagId: "vt-mirror",
@@ -121,7 +139,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Passthrough_returns_same_object_reference_as_dependency()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
         var payload = new object();
 
         var result = sut.Evaluate(
@@ -137,7 +155,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Passthrough_whitespace_variants_match()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             virtualTagId: "vt-ws",
@@ -152,7 +170,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Non_passthrough_falls_through_to_Roslyn()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         var result = sut.Evaluate(
             virtualTagId: "vt-plus1",
@@ -169,7 +187,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Passthrough_missing_dependency_matches_Roslyn_behaviour()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
         const string mirror = "return ctx.GetTag(\"missing\").Value;";
 
         // Roslyn baseline: same source, but force a near-miss that compiles, to capture the
@@ -187,7 +205,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Roslyn_missing_dependency_also_returns_Ok_null()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
         // `(object?)...Value` forces the compiled path (not the mirror shape) but reads the same
         // missing tag; result must match the passthrough missing-dep result above.
         var result = sut.Evaluate(
@@ -209,7 +227,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Passthrough_exact_mirror_missing_dep_matches_Roslyn_baseline()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         // Fast-path: exact mirror shape → passthrough returns Ok(null) for missing dep.
         var fastPath = sut.Evaluate(
@@ -238,7 +256,7 @@ public sealed class RoslynVirtualTagEvaluatorTests
     [Fact]
     public void Passthrough_does_not_populate_the_compiled_script_cache()
     {
-        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance);
+        using var sut = new RoslynVirtualTagEvaluator(NullLogger<RoslynVirtualTagEvaluator>.Instance, NoOpScriptRoot());
 
         // Mirror shape — must take the fast-path, leaving the Roslyn cache untouched.
         sut.Evaluate("vt-mirror", "return ctx.GetTag(\"a\").Value;",
@@ -251,6 +269,36 @@ public sealed class RoslynVirtualTagEvaluatorTests
         CompiledCacheCount(sut).ShouldBe(1);
     }
 
+    /// <summary>
+    /// A script's <c>ctx.Logger.*</c> call flows through the injected root script logger and out
+    /// the <see cref="ScriptLogTopicSink"/>, producing exactly one <see cref="ScriptLogEntry"/>
+    /// carrying the message and the bound identity (<c>ScriptId</c> + <c>VirtualTagId</c> both
+    /// equal the virtual-tag id in the live path).
+    /// </summary>
+    [Fact]
+    public void Script_logger_call_publishes_entry_with_bound_identity()
+    {
+        var publisher = new FakePublisher();
+        var root = new LoggerConfiguration()
+            .MinimumLevel.Verbose()
+            .WriteTo.Sink(new ScriptLogTopicSink(publisher, LogEventLevel.Information))
+            .CreateLogger();
+        using var sut = new RoslynVirtualTagEvaluator(
+            NullLogger<RoslynVirtualTagEvaluator>.Instance, new ScriptRootLogger(root));
+
+        var result = sut.Evaluate(
+            virtualTagId: "vt-log",
+            expression: "ctx.Logger.Information(\"hi from script\"); return 1;",
+            dependencies: new Dictionary<string, object?>());
+
+        result.Success.ShouldBeTrue(result.Reason);
+        publisher.Published.Count.ShouldBe(1);
+        var entry = publisher.Published[0];
+        entry.Message.ShouldBe("hi from script");
+        entry.ScriptId.ShouldBe("vt-log");
+        entry.VirtualTagId.ShouldBe("vt-log");
+    }
+
     /// <summary>Reads the count of the private compiled-script cache via reflection.</summary>
     private static int CompiledCacheCount(RoslynVirtualTagEvaluator sut)
     {