Add regression tests for path casing normalization

PathUtilL0:
- Folder casing normalization (create MiXeDcAsE, query lowercase)
- Idempotency (calling twice returns same result)
- Input casing independence (upper and lower resolve to same canonical)

HostContextL0:
- Root directory returns cached value across calls
- Derived paths (Diag, Externals) share Root prefix casing

.devcontainer/devcontainer.json

@@ -4,7 +4,7 @@
   "features": {
     "ghcr.io/devcontainers/features/docker-in-docker:2": {},
     "ghcr.io/devcontainers/features/dotnet": {
-      "version": "8.0.421"
+      "version": "8.0.420"
     },
     "ghcr.io/devcontainers/features/node:1": {
       "version": "20"

.gitignore

@@ -27,5 +27,4 @@ TestResults
 TestLogs
 .DS_Store
 .mono
-**/*.DotSettings.user
-**/*.lscache
+**/*.DotSettings.user

docs/start/envlinux.md

@@ -25,11 +25,11 @@ The `installdependencies.sh` script should install all required dependencies on
 
 Debian based OS (Debian, Ubuntu, Linux Mint)
 
-- liblttng-ust1t64, liblttng-ust1 or liblttng-ust0
+- liblttng-ust1 or liblttng-ust0
 - libkrb5-3
 - zlib1g
 - libssl3t64, libssl3, libssl1.1, libssl1.0.2 or libssl1.0.0
-- libicu80, libicu79, ..., libicu66, libicu65, libicu63, libicu60, libicu57, libicu55, or libicu52
+- libicu76, libicu75, ..., libicu66, libicu65, libicu63, libicu60, libicu57, libicu55, or libicu52
 
 Fedora based OS (Fedora, Red Hat Enterprise Linux, CentOS, Oracle Linux 7)
 

images/Dockerfile

@@ -5,8 +5,8 @@ ARG TARGETOS
 ARG TARGETARCH
 ARG RUNNER_VERSION
 ARG RUNNER_CONTAINER_HOOKS_VERSION=0.7.0
-ARG DOCKER_VERSION=29.5.0
-ARG BUILDX_VERSION=0.34.0
+ARG DOCKER_VERSION=29.4.0
+ARG BUILDX_VERSION=0.33.0
 
 RUN apt update -y && apt install curl unzip -y
 

src/Misc/externals.sh

@@ -7,7 +7,7 @@ NODE_ALPINE_URL=https://github.com/actions/alpine_nodejs/releases/download
 # When you update Node versions you must also create a new release of alpine_nodejs at that updated version.
 # Follow the instructions here: https://github.com/actions/alpine_nodejs?tab=readme-ov-file#getting-started
 NODE20_VERSION="20.20.2"
-NODE24_VERSION="24.16.0"
+NODE24_VERSION="24.15.0"
 
 get_abs_path() {
   # exploits the fact that pwd will print abs path when no args

src/Misc/layoutbin/installdependencies.sh

@@ -94,7 +94,7 @@ then
             fi
         }
 
-        apt_get_with_fallbacks liblttng-ust1t64 liblttng-ust1 liblttng-ust0
+        apt_get_with_fallbacks liblttng-ust1 liblttng-ust0
         if [ $? -ne 0 ]
         then
             echo "'$apt_get' failed with exit code '$?'"
@@ -110,7 +110,7 @@ then
             exit 1
         fi
 
-        apt_get_with_fallbacks libicu80 libicu79 libicu78 libicu77 libicu76 libicu75 libicu74 libicu73 libicu72 libicu71 libicu70 libicu69 libicu68 libicu67 libicu66 libicu65 libicu63 libicu60 libicu57 libicu55 libicu52
+        apt_get_with_fallbacks libicu76 libicu75 libicu74 libicu73 libicu72 libicu71 libicu70 libicu69 libicu68 libicu67 libicu66 libicu65 libicu63 libicu60 libicu57 libicu55 libicu52
         if [ $? -ne 0 ]
         then
             echo "'$apt_get' failed with exit code '$?'"

src/Runner.Common/Constants.cs

@@ -179,7 +179,6 @@ namespace GitHub.Runner.Common
                 public static readonly string EmitCompositeMarkers = "actions_runner_emit_composite_markers";
                 public static readonly string BatchActionResolution = "actions_batch_action_resolution";
                 public static readonly string UseBearerTokenForCodeload = "actions_use_bearer_token_for_codeload";
-                public static readonly string OverrideDebuggerWelcomeMessage = "actions_runner_override_debugger_welcome_message";
             }
 
             // Node version migration related constants
@@ -206,7 +205,7 @@ namespace GitHub.Runner.Common
                 public static readonly string Node20DeprecationUrl = "https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/";
 
                 // Node 20 migration dates (hardcoded fallbacks, can be overridden via job variables)
-                public static readonly string Node24DefaultDate = "June 16th, 2026";
+                public static readonly string Node24DefaultDate = "June 2nd, 2026";
                 public static readonly string Node20RemovalDate = "September 16th, 2026";
 
                 // Variable keys for server-overridable dates

src/Runner.Common/HostContext.cs

@@ -64,6 +64,7 @@ namespace GitHub.Runner.Common
         private readonly List<ProductInfoHeaderValue> _userAgents = new() { new ProductInfoHeaderValue($"GitHubActionsRunner-{BuildConstants.RunnerPackage.PackageName}", BuildConstants.RunnerPackage.Version) };
         private CancellationTokenSource _runnerShutdownTokenSource = new();
         private object _perfLock = new();
+        private string _canonicalRootDirectory;
         private Tracing _trace;
         private Tracing _actionsHttpTrace;
         private Tracing _netcoreHttpTrace;
@@ -391,7 +392,12 @@ namespace GitHub.Runner.Common
                     break;
 
                 case WellKnownDirectory.Root:
-                    path = new DirectoryInfo(GetDirectory(WellKnownDirectory.Bin)).Parent.FullName;
+                    if (_canonicalRootDirectory == null)
+                    {
+                        _canonicalRootDirectory = PathUtil.GetCanonicalPath(
+                            new DirectoryInfo(GetDirectory(WellKnownDirectory.Bin)).Parent.FullName);
+                    }
+                    path = _canonicalRootDirectory;
                     break;
 
                 case WellKnownDirectory.Temp:

src/Runner.Sdk/Util/PathUtil.cs

@@ -1,4 +1,7 @@
 using System.IO;
+using System.Runtime.InteropServices;
+using System.Text;
+using Microsoft.Win32.SafeHandles;
 
 namespace GitHub.Runner.Sdk
 {
@@ -6,8 +9,98 @@ namespace GitHub.Runner.Sdk
     {
 #if OS_WINDOWS
         public static readonly string PathVariable = "Path";
+
+        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern SafeFileHandle CreateFile(
+            string lpFileName,
+            uint dwDesiredAccess,
+            uint dwShareMode,
+            System.IntPtr lpSecurityAttributes,
+            uint dwCreationDisposition,
+            uint dwFlagsAndAttributes,
+            System.IntPtr hTemplateFile);
+
+        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern uint GetFinalPathNameByHandle(
+            SafeFileHandle hFile,
+            [Out] StringBuilder lpszFilePath,
+            uint cchFilePath,
+            uint dwFlags);
+
+        private const uint FILE_READ_ATTRIBUTES = 0x80;
+        private const uint FILE_SHARE_READ = 0x1;
+        private const uint FILE_SHARE_WRITE = 0x2;
+        private const uint FILE_SHARE_DELETE = 0x4;
+        private const uint OPEN_EXISTING = 3;
+        private const uint FILE_FLAG_BACKUP_SEMANTICS = 0x02000000;
+        private const uint VOLUME_NAME_DOS = 0x0;
+
+        /// <summary>
+        /// Returns the NTFS canonical path for a directory, resolving drive letter
+        /// and folder name casing to match what is stored on disk.
+        /// On non-Windows platforms, returns the path unchanged.
+        /// </summary>
+        public static string GetCanonicalPath(string path)
+        {
+            if (string.IsNullOrEmpty(path) || !Directory.Exists(path))
+            {
+                return path;
+            }
+
+            using var handle = CreateFile(
+                path,
+                FILE_READ_ATTRIBUTES,
+                FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                System.IntPtr.Zero,
+                OPEN_EXISTING,
+                FILE_FLAG_BACKUP_SEMANTICS,
+                System.IntPtr.Zero);
+
+            if (handle.IsInvalid)
+            {
+                return path;
+            }
+
+            var buffer = new StringBuilder(1024);
+            var result = GetFinalPathNameByHandle(handle, buffer, (uint)buffer.Capacity, VOLUME_NAME_DOS);
+            if (result == 0)
+            {
+                return path;
+            }
+
+            // Retry with a larger buffer if the path was longer than expected
+            if (result >= buffer.Capacity)
+            {
+                buffer = new StringBuilder((int)result + 1);
+                result = GetFinalPathNameByHandle(handle, buffer, (uint)buffer.Capacity, VOLUME_NAME_DOS);
+                if (result == 0 || result >= buffer.Capacity)
+                {
+                    return path;
+                }
+            }
+
+            var canonicalPath = buffer.ToString();
+
+            // Strip the \\?\UNC\ prefix and convert to standard UNC path
+            if (canonicalPath.StartsWith(@"\\?\UNC\", System.StringComparison.Ordinal))
+            {
+                canonicalPath = @"\\" + canonicalPath.Substring(8);
+            }
+            // Strip the \\?\ prefix for local paths
+            else if (canonicalPath.StartsWith(@"\\?\", System.StringComparison.Ordinal))
+            {
+                canonicalPath = canonicalPath.Substring(4);
+            }
+
+            return canonicalPath;
+        }
 #else
         public static readonly string PathVariable = "PATH";
+
+        public static string GetCanonicalPath(string path)
+        {
+            return path;
+        }
 #endif
 
         public static string PrependPath(string path, string currentPath)

src/Runner.Worker/Dap/DapDebugger.cs

@@ -16,7 +16,6 @@ using Microsoft.DevTunnels.Connections;
 using Microsoft.DevTunnels.Contracts;
 using Microsoft.DevTunnels.Management;
 using Newtonsoft.Json;
-using Pipelines = GitHub.DistributedTask.Pipelines;
 
 namespace GitHub.Runner.Worker.Dap
 {
@@ -28,7 +27,6 @@ namespace GitHub.Runner.Worker.Dap
         public string DisplayName { get; set; }
         public TaskResult? Result { get; set; }
         public int FrameId { get; set; }
-        public int? SourceLine { get; set; }
     }
 
     /// <summary>
@@ -56,9 +54,6 @@ namespace GitHub.Runner.Worker.Dap
         // Frame IDs for completed steps start at 1000
         private const int _completedFrameIdBase = 1000;
 
-        // Stable session-scoped source reference for the synthesized job step list.
-        private const int _jobStepsSourceReference = 1;
-
         private TcpListener _listener;
         private TcpClient _client;
         private NetworkStream _stream;
@@ -68,7 +63,6 @@ namespace GitHub.Runner.Worker.Dap
         private volatile DapSessionState _state = DapSessionState.NotStarted;
         private CancellationTokenRegistration? _cancellationRegistration;
         private bool _isFirstStep = true;
-        private bool _welcomeMessageSent;
 
         // Dev Tunnel relay host for remote debugging
         private TunnelRelayTunnelHost _tunnelRelayHost;
@@ -103,8 +97,6 @@ namespace GitHub.Runner.Worker.Dap
         // Track completed steps for stack trace
         private readonly List<CompletedStepInfo> _completedSteps = new List<CompletedStepInfo>();
         private int _nextCompletedFrameId = _completedFrameIdBase;
-        private JobExecutionView _jobStepsSource;
-        private bool _jobCompleted;
 
         // Client connection tracking for reconnection support
         private volatile bool _isClientConnected;
@@ -247,179 +239,6 @@ namespace GitHub.Runner.Worker.Dap
             }
         }
 
-        public Task OnJobStepsInitializedAsync(IEnumerable<IStep> steps, IEnumerable<IStep> initialPostSteps)
-        {
-            if (!IsActive)
-            {
-                return Task.CompletedTask;
-            }
-
-            try
-            {
-                IExecutionContext jobContext;
-                lock (_stateLock)
-                {
-                    if (_state != DapSessionState.Ready &&
-                        _state != DapSessionState.Paused &&
-                        _state != DapSessionState.Running)
-                    {
-                        return Task.CompletedTask;
-                    }
-
-                    jobContext = _jobContext;
-                }
-
-                var stepList = steps?.Where(step => step != null).ToList() ?? new List<IStep>();
-                var initialPostStepList = initialPostSteps?.Where(step => step != null).ToList() ?? new List<IStep>();
-                var jobId = jobContext?.GetGitHubContext("job");
-                var snapshot = new JobExecutionView(
-                    jobId,
-                    stepList,
-                    initialPostStepList,
-                    PredictPostSteps(jobContext, stepList, initialPostStepList));
-
-                lock (_stateLock)
-                {
-                    _jobStepsSource = snapshot;
-                    _jobCompleted = false;
-                }
-                Trace.Info("DAP job steps source initialized");
-            }
-            catch (Exception ex)
-            {
-                Trace.Warning("DAP OnJobStepsInitialized error.");
-                Trace.Error(ex);
-            }
-
-            return Task.CompletedTask;
-        }
-
-        public void OnPostStepRegistered(IStep step)
-        {
-            try
-            {
-                if (step is IActionRunner postRunner && postRunner.Action != null)
-                {
-                    JobExecutionView snapshot;
-                    lock (_stateLock)
-                    {
-                        snapshot = _jobStepsSource;
-                    }
-
-                    var line = snapshot?.TryClaimPredictedStep(MatchKeyFor(postRunner.Action.Id), step);
-                    if (line.HasValue)
-                    {
-                        Trace.Info($"DAP job steps source claimed predicted post step '{step.DisplayName}' at line {line.Value}.");
-                    }
-                    else
-                    {
-                        Trace.Info($"DAP job steps source had no predicted line for post step '{step.DisplayName}'.");
-                    }
-                }
-            }
-            catch (Exception ex)
-            {
-                Trace.Warning("DAP OnPostStepRegistered error.");
-                Trace.Error(ex);
-            }
-        }
-
-        private IReadOnlyList<JobExecutionView.PredictedPostStep> PredictPostSteps(
-            IExecutionContext jobContext,
-            IReadOnlyList<IStep> steps,
-            IReadOnlyList<IStep> initialPostSteps)
-        {
-            if (jobContext == null || steps == null || steps.Count == 0)
-            {
-                return Array.Empty<JobExecutionView.PredictedPostStep>();
-            }
-
-            IActionManager actionManager;
-            try
-            {
-                actionManager = HostContext.GetService<IActionManager>();
-            }
-            catch (Exception ex)
-            {
-                Trace.Info($"DAP post-step predictor skipped because IActionManager is unavailable ({ex.Message}).");
-                return Array.Empty<JobExecutionView.PredictedPostStep>();
-            }
-
-            var predictions = new List<JobExecutionView.PredictedPostStep>();
-            var seenActionIds = new HashSet<Guid>();
-            if (initialPostSteps != null)
-            {
-                foreach (var postStep in initialPostSteps)
-                {
-                    if (postStep is IActionRunner postRunner && postRunner.Action != null)
-                    {
-                        seenActionIds.Add(postRunner.Action.Id);
-                    }
-                }
-            }
-
-            foreach (var step in steps)
-            {
-                if (step is not IActionRunner runner ||
-                    runner.Stage == ActionRunStage.Post ||
-                    runner.Action == null)
-                {
-                    continue;
-                }
-
-                var action = runner.Action;
-                if (action.Reference is not Pipelines.RepositoryPathReference repoRef)
-                {
-                    continue;
-                }
-
-                if (!seenActionIds.Add(action.Id))
-                {
-                    continue;
-                }
-
-                Definition definition;
-                try
-                {
-                    definition = actionManager.LoadAction(jobContext, action);
-                }
-                catch (Exception ex)
-                {
-                    Trace.Info($"DAP post-step predictor could not load action '{repoRef.Name}' ({ex.Message}).");
-                    continue;
-                }
-
-                if (definition?.Data?.Execution?.HasPost != true)
-                {
-                    continue;
-                }
-
-                predictions.Add(new JobExecutionView.PredictedPostStep(
-                    GetPostDisplayName(runner),
-                    MatchKeyFor(action.Id)));
-            }
-
-            predictions.Reverse();
-            return predictions;
-        }
-
-        private static string GetPostDisplayName(IActionRunner runner)
-        {
-            var displayName = string.IsNullOrEmpty(runner.DisplayName) ? "step" : runner.DisplayName;
-            if (runner.Stage == ActionRunStage.Pre &&
-                displayName.StartsWith("Pre ", StringComparison.OrdinalIgnoreCase))
-            {
-                displayName = displayName.Substring("Pre ".Length);
-            }
-
-            return $"Post {displayName}";
-        }
-
-        private static string MatchKeyFor(Guid actionId)
-        {
-            return $"post:{actionId:N}";
-        }
-
         public async Task OnJobCompletedAsync()
         {
             if (_state != DapSessionState.NotStarted)
@@ -433,11 +252,6 @@ namespace GitHub.Runner.Worker.Dap
                         if (_jobContext != null)
                         {
                             Trace.Info("Job completed — pausing for inspection");
-                            lock (_stateLock)
-                            {
-                                _jobCompleted = true;
-                            }
-
                             SendStoppedEvent("completed", "Job completed — inspect variables before the session ends.");
 
                             await WaitForCommandAsync(_jobContext.CancellationToken);
@@ -544,7 +358,6 @@ namespace GitHub.Runner.Worker.Dap
                 {
                     _state = DapSessionState.Terminated;
                 }
-                _jobStepsSource = null;
             }
 
             _isClientConnected = false;
@@ -603,8 +416,7 @@ namespace GitHub.Runner.Worker.Dap
                     {
                         DisplayName = step.DisplayName,
                         Result = result,
-                        FrameId = _nextCompletedFrameId++,
-                        SourceLine = _jobStepsSource?.TryGetLineForStep(step)
+                        FrameId = _nextCompletedFrameId++
                     });
                 }
             }
@@ -655,7 +467,6 @@ namespace GitHub.Runner.Worker.Dap
                         "next" => HandleNext(request),
                         "setBreakpoints" => HandleSetBreakpoints(request),
                         "setExceptionBreakpoints" => HandleSetExceptionBreakpoints(request),
-                        "source" => HandleSource(request),
                         "completions" => HandleCompletions(request),
                         "stepIn" => CreateResponse(request, false, "Step In is not supported. Actions jobs debug at the step level - use 'next' to advance to the next step.", body: null),
                         "stepOut" => CreateResponse(request, false, "Step Out is not supported. Actions jobs debug at the step level - use 'continue' to resume.", body: null),
@@ -679,11 +490,6 @@ namespace GitHub.Runner.Worker.Dap
                     });
                     Trace.Info("Sent initialized event");
                 }
-
-                if (request.Command == "configurationDone")
-                {
-                    SendWelcomeMessage();
-                }
             }
             catch (Exception ex)
             {
@@ -702,7 +508,6 @@ namespace GitHub.Runner.Worker.Dap
         internal void HandleClientConnected()
         {
             _isClientConnected = true;
-            _welcomeMessageSent = false;
             Trace.Info("Client connected to debug session");
 
             // If we're paused, re-send the stopped event so the new client
@@ -1013,39 +818,10 @@ namespace GitHub.Runner.Worker.Dap
             });
         }
 
-        internal void SendWelcomeMessage()
-        {
-            if (_welcomeMessageSent)
-            {
-                return;
-            }
-            _welcomeMessageSent = true;
-
-            var debuggerConfig = _jobContext?.Global?.Debugger;
-            if (debuggerConfig?.OverrideWelcomeMessage == true)
-            {
-                if (!string.IsNullOrEmpty(debuggerConfig.WelcomeMessage))
-                {
-                    SendOutput("console", debuggerConfig.WelcomeMessage);
-                    Trace.Info("Sent custom welcome message");
-                }
-                else
-                {
-                    Trace.Info("Welcome message suppressed by override");
-                }
-            }
-            else
-            {
-                SendOutput("console", DapReplParser.GetGeneralHelp());
-                Trace.Info("Sent default welcome message");
-            }
-        }
-
         internal async Task OnStepStartingAsync(IStep step, bool isFirstStep)
         {
             bool pauseOnNextStep;
             CancellationToken cancellationToken;
-
             lock (_stateLock)
             {
                 if (_state != DapSessionState.Ready &&
@@ -1057,7 +833,6 @@ namespace GitHub.Runner.Worker.Dap
 
                 _currentStep = step;
                 _currentStepIndex = _completedSteps.Count;
-                _jobCompleted = false;
                 pauseOnNextStep = _pauseOnNextStep;
                 cancellationToken = _jobContext?.CancellationToken ?? CancellationToken.None;
             }
@@ -1085,9 +860,6 @@ namespace GitHub.Runner.Worker.Dap
             // Send stopped event to debugger (only if client is connected)
             SendStoppedEvent(reason, description);
 
-            // Emit a banner so the user knows where REPL commands will execute
-            SendExecutionContextBanner();
-
             // Wait for debugger command
             await WaitForCommandAsync(cancellationToken);
         }
@@ -1240,46 +1012,29 @@ namespace GitHub.Runner.Worker.Dap
         private Response HandleStackTrace(Request request)
         {
             IStep currentStep;
+            int currentStepIndex;
             CompletedStepInfo[] completedSteps;
-            JobExecutionView jobStepsSource;
-            bool jobCompleted;
             lock (_stateLock)
             {
                 currentStep = _currentStep;
+                currentStepIndex = _currentStepIndex;
                 completedSteps = _completedSteps.ToArray();
-                jobStepsSource = _jobStepsSource;
-                jobCompleted = _jobCompleted;
             }
 
             var frames = new List<StackFrame>();
-            var source = jobStepsSource != null ? BuildJobStepsSource(jobStepsSource) : null;
 
             // Add current step as the top frame
-            if (jobCompleted && jobStepsSource != null)
-            {
-                frames.Add(new StackFrame
-                {
-                    Id = _currentFrameId,
-                    Name = "Complete job [completed]",
-                    Source = source,
-                    Line = jobStepsSource.CompleteJobLine,
-                    Column = 1,
-                    PresentationHint = "normal"
-                });
-            }
-            else if (currentStep != null)
+            if (currentStep != null)
             {
                 var resultIndicator = currentStep.ExecutionContext?.Result != null
                     ? $" [{currentStep.ExecutionContext.Result}]"
                     : " [running]";
-                var currentSourceLine = jobStepsSource?.TryGetLineForStep(currentStep);
 
                 frames.Add(new StackFrame
                 {
                     Id = _currentFrameId,
                     Name = MaskUserVisibleText($"{currentStep.DisplayName ?? "Current Step"}{resultIndicator}"),
-                    Source = currentSourceLine.HasValue ? source : null,
-                    Line = currentSourceLine ?? 0,
+                    Line = currentStepIndex + 1,
                     Column = 1,
                     PresentationHint = "normal"
                 });
@@ -1305,8 +1060,7 @@ namespace GitHub.Runner.Worker.Dap
                 {
                     Id = completedStep.FrameId,
                     Name = MaskUserVisibleText($"{completedStep.DisplayName}{resultStr}"),
-                    Source = completedStep.SourceLine.HasValue ? source : null,
-                    Line = completedStep.SourceLine ?? 0,
+                    Line = 1,
                     Column = 1,
                     PresentationHint = "subtle"
                 });
@@ -1321,76 +1075,6 @@ namespace GitHub.Runner.Worker.Dap
             return CreateResponse(request, true, body: body);
         }
 
-        private Source BuildJobStepsSource(JobExecutionView snapshot)
-        {
-            return new Source
-            {
-                Name = MaskUserVisibleText(snapshot.SourceFileName),
-                Path = MaskUserVisibleText($"{SanitizeSourcePathSegment(snapshot.JobId)}/{snapshot.SourceFileName}"),
-                SourceReference = _jobStepsSourceReference,
-                PresentationHint = "normal"
-            };
-        }
-
-        private static string SanitizeSourcePathSegment(string value)
-        {
-            if (string.IsNullOrWhiteSpace(value))
-            {
-                return "job";
-            }
-
-            var builder = new StringBuilder(value.Length);
-            foreach (var character in value)
-            {
-                builder.Append(char.IsControl(character) || character == '/' || character == '\\'
-                    ? '_'
-                    : character);
-            }
-
-            return builder.Length == 0 ? "job" : builder.ToString();
-        }
-
-        internal Response HandleSource(Request request)
-        {
-            SourceArguments args;
-            try
-            {
-                args = request.Arguments?.ToObject<SourceArguments>();
-            }
-            catch (Exception ex)
-            {
-                Trace.Warning($"Failed to parse source arguments: {ex.GetType().Name}");
-                return CreateResponse(request, false, "Invalid source arguments.", body: null);
-            }
-
-            var sourceReference = args?.Source?.SourceReference ?? args?.SourceReference;
-            if (!sourceReference.HasValue)
-            {
-                return CreateResponse(request, false, "Missing source reference.", body: null);
-            }
-
-            JobExecutionView snapshot;
-            lock (_stateLock)
-            {
-                snapshot = _jobStepsSource;
-            }
-
-            if (snapshot == null)
-            {
-                return CreateResponse(request, false, "Job steps source not yet available.", body: null);
-            }
-
-            if (sourceReference.Value != _jobStepsSourceReference)
-            {
-                return CreateResponse(request, false, $"Unknown source reference: {sourceReference.Value}.", body: null);
-            }
-
-            return CreateResponse(request, true, body: new SourceResponseBody
-            {
-                Content = MaskUserVisibleText(snapshot.Content)
-            });
-        }
-
         private Response HandleScopes(Request request)
         {
             var args = request.Arguments?.ToObject<ScopesArguments>();
@@ -1511,12 +1195,7 @@ namespace GitHub.Runner.Worker.Dap
 
                 case RunCommand run:
                     var context = GetExecutionContextForFrame(frameId);
-                    bool isActionStep;
-                    lock (_stateLock)
-                    {
-                        isActionStep = _currentStep is IActionRunner;
-                    }
-                    return await _replExecutor.ExecuteRunCommandAsync(run, context, isActionStep, cancellationToken);
+                    return await _replExecutor.ExecuteRunCommandAsync(run, context, cancellationToken);
 
                 default:
                     return new EvaluateResponseBody
@@ -1728,40 +1407,6 @@ namespace GitHub.Runner.Worker.Dap
             });
         }
 
-        /// <summary>
-        /// Emits a console output banner telling the user whether REPL
-        /// commands will execute on the host or inside the job container.
-        /// </summary>
-        private void SendExecutionContextBanner()
-        {
-            if (!_isClientConnected)
-            {
-                return;
-            }
-
-            bool isActionStep = _currentStep is IActionRunner;
-            var container = _jobContext?.Global?.Container;
-
-            string target;
-            if (isActionStep && container != null &&
-                (!string.IsNullOrEmpty(container.ContainerId) ||
-                 FeatureManager.IsContainerHooksEnabled(_jobContext?.Global?.Variables)))
-            {
-                var image = container.ContainerImage ?? "container";
-                var shortId = !string.IsNullOrEmpty(container.ContainerId) && container.ContainerId.Length >= 12
-                    ? container.ContainerId.Substring(0, 12)
-                    : container.ContainerId ?? "";
-                var idSuffix = !string.IsNullOrEmpty(shortId) ? $" ({shortId})" : "";
-                target = $"job container: {image}{idSuffix}";
-            }
-            else
-            {
-                target = "runner host";
-            }
-
-            SendOutput("console", $"\nCommands will run on {target}\n");
-        }
-
         private string MaskUserVisibleText(string value)
         {
             if (string.IsNullOrEmpty(value))

src/Runner.Worker/Dap/DapMessages.cs

@@ -537,46 +537,6 @@ namespace GitHub.Runner.Worker.Dap
 
     #endregion
 
-    #region Source Request/Response
-
-    /// <summary>
-    /// Arguments for 'source' request.
-    /// </summary>
-    public class SourceArguments
-    {
-        /// <summary>
-        /// Source descriptor. Some clients send sourceReference only here.
-        /// </summary>
-        [JsonProperty("source", NullValueHandling = NullValueHandling.Ignore)]
-        public Source Source { get; set; }
-
-        /// <summary>
-        /// The reference to the source.
-        /// </summary>
-        [JsonProperty("sourceReference", NullValueHandling = NullValueHandling.Ignore)]
-        public int? SourceReference { get; set; }
-    }
-
-    /// <summary>
-    /// Response body for 'source' request.
-    /// </summary>
-    public class SourceResponseBody
-    {
-        /// <summary>
-        /// Content of the source as a string.
-        /// </summary>
-        [JsonProperty("content")]
-        public string Content { get; set; }
-
-        /// <summary>
-        /// Optional content type / mime type of the source.
-        /// </summary>
-        [JsonProperty("mimeType", NullValueHandling = NullValueHandling.Ignore)]
-        public string MimeType { get; set; }
-    }
-
-    #endregion
-
     #region Scopes Request/Response
 
     /// <summary>

src/Runner.Worker/Dap/DapReplExecutor.cs

@@ -9,7 +9,6 @@ using GitHub.DistributedTask.Pipelines.ContextData;
 using GitHub.Runner.Common;
 using GitHub.Runner.Common.Util;
 using GitHub.Runner.Sdk;
-using GitHub.Runner.Worker.Container;
 using GitHub.Runner.Worker.Handlers;
 
 namespace GitHub.Runner.Worker.Dap
@@ -44,7 +43,6 @@ namespace GitHub.Runner.Worker.Dap
         public async Task<EvaluateResponseBody> ExecuteRunCommandAsync(
             RunCommand command,
             IExecutionContext context,
-            bool isActionStep,
             CancellationToken cancellationToken)
         {
             if (context == null)
@@ -54,7 +52,7 @@ namespace GitHub.Runner.Worker.Dap
 
             try
             {
-                return await ExecuteScriptAsync(command, context, isActionStep, cancellationToken);
+                return await ExecuteScriptAsync(command, context, cancellationToken);
             }
             catch (Exception ex)
             {
@@ -67,17 +65,9 @@ namespace GitHub.Runner.Worker.Dap
         private async Task<EvaluateResponseBody> ExecuteScriptAsync(
             RunCommand command,
             IExecutionContext context,
-            bool isActionStep,
             CancellationToken cancellationToken)
         {
-            // 1. Resolve step host — container or host, same as ActionRunner.
-            //    Only action steps (user-defined run:/uses:) execute inside the
-            //    container.  Infrastructure steps (Set up job, Initialize
-            //    containers, Complete job, etc.) always run on the host.
-            var stepHost = CreateStepHost(context, isActionStep);
-            var isContainerStepHost = stepHost is IContainerStepHost;
-
-            // 2. Resolve shell — same logic as ScriptHandler
+            // 1. Resolve shell — same logic as ScriptHandler
             string shellCommand;
             string argFormat;
 
@@ -97,9 +87,9 @@ namespace GitHub.Runner.Worker.Dap
                 argFormat = ScriptHandlerHelpers.GetScriptArgumentsFormat(shellCommand);
             }
 
-            _trace.Info($"Resolved REPL shell (container={isContainerStepHost})");
+            _trace.Info("Resolved REPL shell");
 
-            // 3. Expand ${{ }} expressions in the script body, just like
+            // 2. Expand ${{ }} expressions in the script body, just like
             //    ActionRunner evaluates step inputs before ScriptHandler sees them
             var contents = ExpandExpressions(command.Script, context);
             contents = ScriptHandlerHelpers.FixUpScriptContents(shellCommand, contents);
@@ -121,47 +111,25 @@ namespace GitHub.Runner.Worker.Dap
 
             try
             {
-                // 4. Resolve script path — translate for container if needed
-                var resolvedPath = stepHost.ResolvePathForStepHost(context, scriptFilePath).Replace("\"", "\\\"");
+                // 3. Format arguments with script path
+                var resolvedPath = scriptFilePath.Replace("\"", "\\\"");
                 if (string.IsNullOrEmpty(argFormat) || !argFormat.Contains("{0}"))
                 {
                     return ErrorResult($"Invalid shell option '{shellCommand}'. Shell must be a valid built-in (bash, sh, cmd, powershell, pwsh) or a format string containing '{{0}}'");
                 }
                 var arguments = string.Format(argFormat, resolvedPath);
 
-                // 5. Resolve shell command path — for containers, use the shell
-                //    name directly (it will be resolved inside the container);
-                //    for host execution, resolve the full path on the host.
+                // 4. Resolve shell command path
                 string prependPath = string.Join(
                     Path.PathSeparator.ToString(),
                     Enumerable.Reverse(context.Global.PrependPath));
-                var fileName = isContainerStepHost
-                    ? shellCommand
-                    : WhichUtil.Which(shellCommand, false, _trace, prependPath) ?? shellCommand;
+                var commandPath = WhichUtil.Which(shellCommand, false, _trace, prependPath)
+                    ?? shellCommand;
 
-                // 6. Build environment — merge from execution context like a real step
+                // 5. Build environment — merge from execution context like a real step
                 var environment = BuildEnvironment(context, command.Env);
 
-                // 7. Handle PrependPath — mirrors Handler.AddPrependPathToEnvironment
-                if (context.Global.PrependPath.Count > 0)
-                {
-                    if (stepHost is IContainerStepHost containerHost)
-                    {
-                        containerHost.PrependPath = prependPath;
-                    }
-                    else
-                    {
-                        string taskEnvPATH;
-                        environment.TryGetValue(Constants.PathVariable, out taskEnvPATH);
-                        string originalPath = context.Global.Variables?.Get(Constants.PathVariable) ?? // Prefer a job variable.
-                            taskEnvPATH ?? // Then a task-environment variable.
-                            System.Environment.GetEnvironmentVariable(Constants.PathVariable) ?? // Then an environment variable.
-                            string.Empty;
-                        environment[Constants.PathVariable] = PathUtil.PrependPath(prependPath, originalPath);
-                    }
-                }
-
-                // 8. Resolve working directory — translate for container
+                // 6. Resolve working directory
                 var workingDirectory = command.WorkingDirectory;
                 if (string.IsNullOrEmpty(workingDirectory))
                 {
@@ -173,60 +141,48 @@ namespace GitHub.Runner.Worker.Dap
                         : null;
                     workingDirectory = workspace ?? _hostContext.GetDirectory(WellKnownDirectory.Work);
                 }
-                workingDirectory = stepHost.ResolvePathForStepHost(context, workingDirectory);
 
                 _trace.Info("Executing REPL command");
 
                 // Stream execution info to debugger
                 SendOutput("console", $"$ {shellCommand} {command.Script.Substring(0, Math.Min(command.Script.Length, 80))}{(command.Script.Length > 80 ? "..." : "")}\n");
 
-                // NOTE: When container hooks are enabled, ContainerStepHost routes
-                // execution through IContainerHookManager which does not raise
-                // OutputDataReceived/ErrorDataReceived events. Output will not be
-                // streamed to the debug console in that mode.
-                if (isContainerStepHost && FeatureManager.IsContainerHooksEnabled(context.Global?.Variables))
+                // 7. Execute via IProcessInvoker (same as DefaultStepHost)
+                int exitCode;
+                using (var processInvoker = _hostContext.CreateService<IProcessInvoker>())
                 {
-                    const string hookWarning = "Container hooks are enabled. REPL output will not be streamed to the debug console for this command.";
-                    _trace.Warning(hookWarning);
-                    SendOutput("stderr", hookWarning + "\n");
+                    processInvoker.OutputDataReceived += (sender, args) =>
+                    {
+                        if (!string.IsNullOrEmpty(args.Data))
+                        {
+                            var masked = _hostContext.SecretMasker.MaskSecrets(args.Data);
+                            SendOutput("stdout", masked + "\n");
+                        }
+                    };
+
+                    processInvoker.ErrorDataReceived += (sender, args) =>
+                    {
+                        if (!string.IsNullOrEmpty(args.Data))
+                        {
+                            var masked = _hostContext.SecretMasker.MaskSecrets(args.Data);
+                            SendOutput("stderr", masked + "\n");
+                        }
+                    };
+
+                    exitCode = await processInvoker.ExecuteAsync(
+                        workingDirectory: workingDirectory,
+                        fileName: commandPath,
+                        arguments: arguments,
+                        environment: environment,
+                        requireExitCodeZero: false,
+                        outputEncoding: null,
+                        killProcessOnCancel: true,
+                        cancellationToken: cancellationToken);
                 }
 
-                // 9. Execute via IStepHost — handles docker exec for containers,
-                //    direct process execution for host, and container hooks
-                stepHost.OutputDataReceived += (sender, args) =>
-                {
-                    if (!string.IsNullOrEmpty(args.Data))
-                    {
-                        var masked = _hostContext.SecretMasker.MaskSecrets(args.Data);
-                        SendOutput("stdout", masked + "\n");
-                    }
-                };
-
-                stepHost.ErrorDataReceived += (sender, args) =>
-                {
-                    if (!string.IsNullOrEmpty(args.Data))
-                    {
-                        var masked = _hostContext.SecretMasker.MaskSecrets(args.Data);
-                        SendOutput("stderr", masked + "\n");
-                    }
-                };
-
-                int exitCode = await stepHost.ExecuteAsync(
-                    context: context,
-                    workingDirectory: workingDirectory,
-                    fileName: fileName,
-                    arguments: arguments,
-                    environment: environment,
-                    requireExitCodeZero: false,
-                    outputEncoding: null,
-                    killProcessOnCancel: true,
-                    inheritConsoleHandler: false,
-                    standardInInput: null,
-                    cancellationToken: cancellationToken);
-
                 _trace.Info($"REPL command exited with code {exitCode}");
 
-                // 10. Return only the exit code summary (output was already streamed)
+                // 8. Return only the exit code summary (output was already streamed)
                 return new EvaluateResponseBody
                 {
                     Result = exitCode == 0 ? $"(exit code: {exitCode})" : $"Process completed with exit code {exitCode}.",
@@ -242,43 +198,6 @@ namespace GitHub.Runner.Worker.Dap
             }
         }
 
-        /// <summary>
-        /// Creates the appropriate <see cref="IStepHost"/> for the current
-        /// execution context, mirroring how <see cref="ActionRunner"/> decides
-        /// between host and container execution.
-        ///
-        /// Only action steps (user-defined run:/uses: steps) run inside the
-        /// job container.  Infrastructure steps like "Set up job", "Initialize
-        /// containers", "Stop containers", and "Complete job" always execute
-        /// on the host regardless of whether a container is configured.
-        /// </summary>
-        internal IStepHost CreateStepHost(IExecutionContext context, bool isActionStep)
-        {
-            if (!isActionStep)
-            {
-                _trace.Info("Creating DefaultStepHost for REPL execution (infrastructure step)");
-                return _hostContext.CreateService<IDefaultStepHost>();
-            }
-
-            var container = context?.Global?.Container;
-            if (container != null)
-            {
-                // Container hooks don't always set ContainerId, but the container
-                // step host handles that internally
-                var hooksEnabled = FeatureManager.IsContainerHooksEnabled(context.Global?.Variables);
-                if (hooksEnabled || !string.IsNullOrEmpty(container.ContainerId))
-                {
-                    _trace.Info("Creating ContainerStepHost for REPL execution");
-                    var containerStepHost = _hostContext.CreateService<IContainerStepHost>();
-                    containerStepHost.Container = container;
-                    return containerStepHost;
-                }
-            }
-
-            _trace.Info("Creating DefaultStepHost for REPL execution");
-            return _hostContext.CreateService<IDefaultStepHost>();
-        }
-
         /// <summary>
         /// Expands <c>${{ }}</c> expressions in the input string using the
         /// runner's template evaluator — the same evaluation path that processes

src/Runner.Worker/Dap/DebuggerConfig.cs

@@ -1,4 +1,4 @@
-using GitHub.DistributedTask.Pipelines;
+using GitHub.DistributedTask.Pipelines;
 
 namespace GitHub.Runner.Worker.Dap
 {
@@ -8,12 +8,10 @@ namespace GitHub.Runner.Worker.Dap
     /// </summary>
     public sealed class DebuggerConfig
     {
-        public DebuggerConfig(bool enabled, DebuggerTunnelInfo tunnel, bool overrideWelcomeMessage = false, string welcomeMessage = null)
+        public DebuggerConfig(bool enabled, DebuggerTunnelInfo tunnel)
         {
             Enabled = enabled;
             Tunnel = tunnel;
-            OverrideWelcomeMessage = overrideWelcomeMessage;
-            WelcomeMessage = welcomeMessage;
         }
 
         /// <summary>Whether the debugger is enabled for this job.</summary>
@@ -25,19 +23,6 @@ namespace GitHub.Runner.Worker.Dap
         /// </summary>
         public DebuggerTunnelInfo Tunnel { get; }
 
-        /// <summary>
-        /// When true, the runner overrides the default welcome message with
-        /// <see cref="WelcomeMessage"/>. A null or empty <see cref="WelcomeMessage"/>
-        /// suppresses the message entirely. When false, the default help text is shown.
-        /// </summary>
-        public bool OverrideWelcomeMessage { get; }
-
-        /// <summary>
-        /// Optional welcome message content for the debugger console. Only used when
-        /// <see cref="OverrideWelcomeMessage"/> is true.
-        /// </summary>
-        public string WelcomeMessage { get; }
-
         /// <summary>Whether the tunnel configuration is complete and valid.</summary>
         public bool HasValidTunnel => Tunnel != null
             && !string.IsNullOrEmpty(Tunnel.TunnelId)

src/Runner.Worker/Dap/IDapDebugger.cs

@@ -1,5 +1,4 @@
-using System.Collections.Generic;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using GitHub.Runner.Common;
 
 namespace GitHub.Runner.Worker.Dap
@@ -20,8 +19,6 @@ namespace GitHub.Runner.Worker.Dap
     {
         Task StartAsync(IExecutionContext jobContext);
         Task WaitUntilReadyAsync();
-        Task OnJobStepsInitializedAsync(IEnumerable<IStep> steps, IEnumerable<IStep> initialPostSteps);
-        void OnPostStepRegistered(IStep step);
         Task OnStepStartingAsync(IStep step);
         void OnStepCompleted(IStep step);
         Task OnJobCompletedAsync();

src/Runner.Worker/Dap/JobExecutionView.cs

@@ -1,358 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Text;
-
-namespace GitHub.Runner.Worker.Dap
-{
-    internal sealed class JobExecutionView
-    {
-        private const string _sourceFileName = "execution.yml";
-
-        private readonly object _lock = new object();
-        private readonly List<SourceEntry> _preEntries = new List<SourceEntry>();
-        private readonly List<SourceEntry> _mainEntries = new List<SourceEntry>();
-        private readonly List<SourceEntry> _postEntries = new List<SourceEntry>();
-        private readonly List<StepLine> _lineByStep = new List<StepLine>();
-        private string _content;
-        private int _completeJobLine;
-
-        public JobExecutionView(
-            string jobId,
-            IEnumerable<IStep> steps,
-            IEnumerable<IStep> initialPostSteps,
-            IEnumerable<PredictedPostStep> predictedPostSteps = null)
-        {
-            JobId = string.IsNullOrWhiteSpace(jobId) ? "job" : jobId;
-
-            _preEntries.Add(new SourceEntry("Setup job"));
-            AddSteps(steps);
-            AddPredictedPostSteps(predictedPostSteps);
-            AddSteps(initialPostSteps);
-            _postEntries.Add(SourceEntry.CreateSyntheticCompleteJob());
-            Render();
-        }
-
-        public string JobId { get; }
-        public string SourceFileName => _sourceFileName;
-
-        public string Content
-        {
-            get
-            {
-                lock (_lock)
-                {
-                    return _content;
-                }
-            }
-        }
-
-        public int CompleteJobLine
-        {
-            get
-            {
-                lock (_lock)
-                {
-                    return _completeJobLine;
-                }
-            }
-        }
-
-        public int? TryClaimPredictedStep(string matchKey, IStep step)
-        {
-            if (string.IsNullOrEmpty(matchKey) || step == null)
-            {
-                return null;
-            }
-
-            lock (_lock)
-            {
-                var existingLine = TryGetLineForStepNoLock(step);
-                if (existingLine.HasValue)
-                {
-                    return existingLine;
-                }
-
-                foreach (var entry in _postEntries)
-                {
-                    if (!string.Equals(entry.MatchKey, matchKey, StringComparison.Ordinal))
-                    {
-                        continue;
-                    }
-
-                    if (entry.Step != null && !ReferenceEquals(entry.Step, step))
-                    {
-                        return null;
-                    }
-
-                    entry.Step = step;
-                    Render();
-                    return TryGetLineForStepNoLock(step);
-                }
-
-                return null;
-            }
-        }
-
-        public int? TryGetLineForStep(IStep step)
-        {
-            if (step == null)
-            {
-                return null;
-            }
-
-            lock (_lock)
-            {
-                return TryGetLineForStepNoLock(step);
-            }
-        }
-
-        private int? TryGetLineForStepNoLock(IStep step)
-        {
-            foreach (var stepLine in _lineByStep)
-            {
-                if (ReferenceEquals(stepLine.Step, step))
-                {
-                    return stepLine.Line;
-                }
-            }
-
-            return null;
-        }
-
-        private void AddSteps(IEnumerable<IStep> steps)
-        {
-            if (steps == null)
-            {
-                return;
-            }
-
-            foreach (var step in steps)
-            {
-                if (step == null)
-                {
-                    continue;
-                }
-
-                GetEntries(GetSection(step)).Add(new SourceEntry(step));
-            }
-        }
-
-        private void AddPredictedPostSteps(IEnumerable<PredictedPostStep> steps)
-        {
-            if (steps == null)
-            {
-                return;
-            }
-
-            foreach (var step in steps)
-            {
-                if (step == null)
-                {
-                    continue;
-                }
-
-                _postEntries.Add(new SourceEntry(step.DisplayName, step.MatchKey));
-            }
-        }
-
-        private List<SourceEntry> GetEntries(SourceSection section)
-        {
-            switch (section)
-            {
-                case SourceSection.Pre:
-                    return _preEntries;
-                case SourceSection.Post:
-                    return _postEntries;
-                default:
-                    return _mainEntries;
-            }
-        }
-
-        private static SourceSection GetSection(IStep step)
-        {
-            if (step is IActionRunner actionRunner)
-            {
-                return GetSection(actionRunner.Stage);
-            }
-
-            if (step.ExecutionContext != null)
-            {
-                return GetSection(step.ExecutionContext.Stage);
-            }
-
-            return SourceSection.Main;
-        }
-
-        private static SourceSection GetSection(ActionRunStage stage)
-        {
-            switch (stage)
-            {
-                case ActionRunStage.Pre:
-                    return SourceSection.Pre;
-                case ActionRunStage.Post:
-                    return SourceSection.Post;
-                default:
-                    return SourceSection.Main;
-            }
-        }
-
-        private void Render()
-        {
-            _lineByStep.Clear();
-            _completeJobLine = 0;
-
-            var sb = new StringBuilder();
-            var line = 1;
-
-            AppendSection(sb, "pre", _preEntries, ref line, appendSeparatorLine: true);
-            AppendSection(sb, "main", _mainEntries, ref line, appendSeparatorLine: true);
-            AppendSection(sb, "post", _postEntries, ref line, appendSeparatorLine: false);
-
-            _content = sb.ToString();
-        }
-
-        private void AppendSection(
-            StringBuilder sb,
-            string sectionName,
-            IReadOnlyList<SourceEntry> entries,
-            ref int line,
-            bool appendSeparatorLine)
-        {
-            sb.Append(sectionName).Append(":\n");
-            line++;
-
-            foreach (var entry in entries)
-            {
-                if (entry.Step != null && TryGetLineForStepNoLock(entry.Step) == null)
-                {
-                    _lineByStep.Add(new StepLine(entry.Step, line));
-                }
-
-                sb.Append("  - step: ");
-                sb.Append(FormatYamlString(entry.DisplayName));
-                sb.Append('\n');
-                if (entry.IsSyntheticCompleteJob)
-                {
-                    _completeJobLine = line;
-                }
-
-                line++;
-            }
-
-            if (appendSeparatorLine)
-            {
-                sb.Append('\n');
-                line++;
-            }
-        }
-
-        private static string FormatYamlString(string value)
-        {
-            var sb = new StringBuilder();
-            sb.Append('"');
-            foreach (var c in value)
-            {
-                switch (c)
-                {
-                    case '\\':
-                        sb.Append(@"\\");
-                        break;
-                    case '"':
-                        sb.Append("\\\"");
-                        break;
-                    case '\r':
-                        sb.Append(@"\r");
-                        break;
-                    case '\n':
-                        sb.Append(@"\n");
-                        break;
-                    case '\t':
-                        sb.Append(@"\t");
-                        break;
-                    default:
-                        if (char.IsControl(c))
-                        {
-                            sb.Append(@"\u");
-                            sb.Append(((int)c).ToString("x4", CultureInfo.InvariantCulture));
-                        }
-                        else
-                        {
-                            sb.Append(c);
-                        }
-                        break;
-                }
-            }
-
-            sb.Append('"');
-            return sb.ToString();
-        }
-
-        internal sealed class PredictedPostStep
-        {
-            public PredictedPostStep(string displayName, string matchKey)
-            {
-                DisplayName = string.IsNullOrEmpty(displayName) ? "step" : displayName;
-                MatchKey = matchKey;
-            }
-
-            public string DisplayName { get; }
-            public string MatchKey { get; }
-        }
-
-        private sealed class StepLine
-        {
-            public StepLine(IStep step, int line)
-            {
-                Step = step;
-                Line = line;
-            }
-
-            public IStep Step { get; }
-            public int Line { get; }
-        }
-
-        private sealed class SourceEntry
-        {
-            public SourceEntry(string displayName)
-            {
-                DisplayName = string.IsNullOrEmpty(displayName) ? "step" : displayName;
-            }
-
-            public SourceEntry(string displayName, string matchKey)
-                : this(displayName)
-            {
-                MatchKey = matchKey;
-            }
-
-            public SourceEntry(IStep step)
-            {
-                Step = step;
-                DisplayName = string.IsNullOrEmpty(step.DisplayName) ? "step" : step.DisplayName;
-            }
-
-            private SourceEntry(string displayName, bool isSyntheticCompleteJob)
-                : this(displayName)
-            {
-                IsSyntheticCompleteJob = isSyntheticCompleteJob;
-            }
-
-            public static SourceEntry CreateSyntheticCompleteJob()
-            {
-                return new SourceEntry("Complete job", isSyntheticCompleteJob: true);
-            }
-
-            public IStep Step { get; set; }
-            public string DisplayName { get; }
-            public string MatchKey { get; }
-            public bool IsSyntheticCompleteJob { get; }
-        }
-
-        private enum SourceSection
-        {
-            Pre,
-            Main,
-            Post
-        }
-    }
-}

src/Runner.Worker/ExecutionContext.cs

@@ -337,25 +337,7 @@ namespace GitHub.Runner.Worker
             }
 
             step.ExecutionContext = Root.CreatePostChild(step.DisplayName, IntraActionState, siblingScopeName);
-            if (step is JobExtensionRunner)
-            {
-                step.ExecutionContext.StepTelemetry.Type = "runner";
-                step.ExecutionContext.StepTelemetry.Action = step.DisplayName.ToLowerInvariant().Replace(' ', '_');
-            }
             Root.PostJobSteps.Push(step);
-
-            if (Root.Global.Debugger?.Enabled == true)
-            {
-                try
-                {
-                    HostContext.GetService<Dap.IDapDebugger>().OnPostStepRegistered(step);
-                }
-                catch (Exception ex)
-                {
-                    Trace.Warning("Failed to notify DAP debugger about registered post job step.");
-                    Trace.Error(ex);
-                }
-            }
         }
 
         public IExecutionContext CreateChild(
@@ -988,8 +970,7 @@ namespace GitHub.Runner.Worker
             Global.WriteDebug = Global.Variables.Step_Debug ?? false;
 
             // Debugger enabled flag (from acquire response).
-            var overrideDebuggerWelcomeMessage = Global.Variables.GetBoolean(Constants.Runner.Features.OverrideDebuggerWelcomeMessage) ?? false;
-            Global.Debugger = new Dap.DebuggerConfig(message.EnableDebugger, message.DebuggerTunnel, overrideDebuggerWelcomeMessage, message.DebuggerWelcomeMessage);
+            Global.Debugger = new Dap.DebuggerConfig(message.EnableDebugger, message.DebuggerTunnel);
 
             // Hook up JobServerQueueThrottling event, we will log warning on server tarpit.
             _jobServerQueue.JobServerQueueThrottling += JobServerQueueThrottling_EventReceived;

src/Runner.Worker/Handlers/NodeScriptActionHandler.cs

@@ -12,7 +12,6 @@ using GitHub.Runner.Common.Util;
 using GitHub.Runner.Sdk;
 using GitHub.Runner.Worker.Container;
 using GitHub.Runner.Worker.Container.ContainerHooks;
-using GitHub.Services.Common;
 
 namespace GitHub.Runner.Worker.Handlers
 {
@@ -129,15 +128,6 @@ namespace GitHub.Runner.Worker.Handlers
             // file name character on Linux.
             string arguments = StepHost.ResolvePathForStepHost(ExecutionContext, StringUtil.Format(@"""{0}""", target.Replace(@"""", @"\""")));
 
-            // Disable maglev jit compiler in node.js 24.x.x on x64 Windows until the node.js bug is fixed.
-            // https://github.com/nodejs/node/issues/62260
-            if (nodeRuntimeVersion.StartsWith("node24", StringComparison.OrdinalIgnoreCase) &&
-                (StringUtil.ConvertToBoolean(System.Environment.GetEnvironmentVariable("ACTIONS_RUNNER_DISABLE_NODE_MAGLEV")) || StringUtil.ConvertToBoolean(Environment.GetValueOrDefault("ACTIONS_RUNNER_DISABLE_NODE_MAGLEV"))))
-            {
-                Trace.Info("Disable maglev jit compiler in node.js");
-                arguments = $"--no-maglev {arguments}";
-            }
-
 #if OS_WINDOWS
             // It appears that node.exe outputs UTF8 when not in TTY mode.
             Encoding outputEncoding = Encoding.UTF8;

src/Runner.Worker/JobRunner.cs

@@ -13,7 +13,6 @@ using GitHub.DistributedTask.WebApi;
 using GitHub.Runner.Common;
 using GitHub.Runner.Common.Util;
 using GitHub.Runner.Sdk;
-using GitHub.Runner.Worker.Dap;
 using GitHub.Services.Common;
 using GitHub.Services.WebApi;
 using Sdk.RSWebApi.Contracts;
@@ -231,12 +230,6 @@ namespace GitHub.Runner.Worker
                         jobContext.JobSteps.Enqueue(step);
                     }
 
-                    if (jobContext.Global.Debugger?.Enabled == true)
-                    {
-                        var dapDebugger = HostContext.GetService<IDapDebugger>();
-                        await dapDebugger.OnJobStepsInitializedAsync(jobContext.JobSteps, jobContext.PostJobSteps);
-                    }
-
                     await stepsRunner.RunAsync(jobContext);
                 }
                 catch (Exception ex)

src/Sdk/DTPipelines/Pipelines/AgentJobRequestMessage.cs

@@ -267,21 +267,6 @@ namespace GitHub.DistributedTask.Pipelines
             set;
         }
 
-        /// <summary>
-        /// Optional welcome message shown in the debugger console when a client connects.
-        /// Only used when the <c>actions_runner_override_debugger_welcome_message</c>
-        /// feature flag is set to <c>true</c> in the job variables. With the flag set,
-        /// a non-empty value is shown as-is and a null or empty value suppresses the
-        /// default welcome message. When the flag is not set, the runner shows its
-        /// built-in help text and this field is ignored.
-        /// </summary>
-        [DataMember(EmitDefaultValue = false)]
-        public string DebuggerWelcomeMessage
-        {
-            get;
-            set;
-        }
-
         /// <summary>
         /// Gets the workflow-level action dependencies (lockfile entries)
         /// </summary>

src/Sdk/DTPipelines/workflow-v1.0.json

@@ -186,16 +186,7 @@
         "vars",
         "needs",
         "strategy",
-        "matrix",
-        "steps",
-        "job",
-        "runner",
-        "env",
-        "always(0,0)",
-        "failure(0,0)",
-        "cancelled(0,0)",
-        "success(0,0)",
-        "hashFiles(1,255)"
+        "matrix"
       ],
       "string": {}
     },

src/Sdk/WorkflowParser/Conversion/WorkflowTemplateConverter.cs

@@ -2291,10 +2291,6 @@ namespace GitHub.Actions.WorkflowParser.Conversion
             new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Needs),
             new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Strategy),
             new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Matrix),
-            new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Steps),
-            new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Job),
-            new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Runner),
-            new NamedValueInfo<NoOperationNamedValue>(WorkflowTemplateConstants.Env),
         };
         private static readonly IFunctionInfo[] s_jobConditionFunctions = new IFunctionInfo[]
         {
@@ -2311,13 +2307,6 @@ namespace GitHub.Actions.WorkflowParser.Conversion
             new FunctionInfo<NoOperation>(WorkflowTemplateConstants.Success, 0, 0),
             new FunctionInfo<NoOperation>(WorkflowTemplateConstants.HashFiles, 1, Byte.MaxValue),
         };
-        private static readonly IFunctionInfo[] s_snapshotConditionFunctions = new IFunctionInfo[]
-        {
-            new FunctionInfo<NoOperation>(WorkflowTemplateConstants.Always, 0, 0),
-            new FunctionInfo<NoOperation>(WorkflowTemplateConstants.Cancelled, 0, 0),
-            new FunctionInfo<NoOperation>(WorkflowTemplateConstants.Failure, 0, 0),
-            new FunctionInfo<NoOperation>(WorkflowTemplateConstants.Success, 0, 0),
-            new FunctionInfo<NoOperation>(WorkflowTemplateConstants.HashFiles, 1, Byte.MaxValue),
-        };
+        private static readonly IFunctionInfo[] s_snapshotConditionFunctions = null;
     }
 }

src/Sdk/WorkflowParser/workflow-v1.0.json

@@ -2196,16 +2196,7 @@
         "vars",
         "needs",
         "strategy",
-        "matrix",
-        "steps",
-        "job",
-        "runner",
-        "env",
-        "always(0,0)",
-        "failure(0,0)",
-        "cancelled(0,0)",
-        "success(0,0)",
-        "hashFiles(1,255)"
+        "matrix"
       ],
       "description": "Use the if conditional to prevent a snapshot from being taken unless a condition is met. Any supported context and expression can be used to create a conditional. Expressions in an `if` conditional do not require the bracketed expression syntax. When you use expressions in an `if` conditional, you may omit the expression syntax because GitHub automatically evaluates the `if` conditional as an expression.",
       "string": {

src/Test/L0/HostContextL0.cs

@@ -299,6 +299,52 @@ namespace GitHub.Runner.Common.Tests
             }
         }
 
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetDirectoryRootReturnsCachedValue()
+        {
+            try
+            {
+                Setup();
+
+                // Call GetDirectory(Root) twice — should return the same reference
+                var root1 = _hc.GetDirectory(WellKnownDirectory.Root);
+                var root2 = _hc.GetDirectory(WellKnownDirectory.Root);
+
+                Assert.NotNull(root1);
+                Assert.Equal(root1, root2);
+                Assert.True(Directory.Exists(root1));
+            }
+            finally
+            {
+                Teardown();
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetDirectoryDerivedPathsUseRootCasing()
+        {
+            try
+            {
+                Setup();
+
+                var root = _hc.GetDirectory(WellKnownDirectory.Root);
+                var diag = _hc.GetDirectory(WellKnownDirectory.Diag);
+                var externals = _hc.GetDirectory(WellKnownDirectory.Externals);
+
+                // Diag and Externals should start with the same Root prefix
+                Assert.StartsWith(root, diag);
+                Assert.StartsWith(root, externals);
+            }
+            finally
+            {
+                Teardown();
+            }
+        }
+
         private void Setup([CallerMemberName] string testName = "")
         {
             _tokenSource = new CancellationTokenSource();

src/Test/L0/Sdk/RSWebApi/AgentJobRequestMessageL0.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.IO;
 using System.Runtime.Serialization.Json;
 using System.Text;
@@ -17,13 +17,13 @@ public sealed class AgentJobRequestMessageL0
         // Arrange
         var serializer = new DataContractJsonSerializer(typeof(AgentJobRequestMessage));
         string jsonWithEnabledDebugger = DoubleQuotify("{'EnableDebugger': true}");
-
+        
         // Act
         using var stream = new MemoryStream();
         stream.Write(Encoding.UTF8.GetBytes(jsonWithEnabledDebugger));
         stream.Position = 0;
         var recoveredMessage = serializer.ReadObject(stream) as AgentJobRequestMessage;
-
+        
         // Assert
         Assert.NotNull(recoveredMessage);
         Assert.True(recoveredMessage.EnableDebugger, "EnableDebugger should be true when JSON contains 'EnableDebugger': true");
@@ -37,13 +37,13 @@ public sealed class AgentJobRequestMessageL0
         // Arrange
         var serializer = new DataContractJsonSerializer(typeof(AgentJobRequestMessage));
         string jsonWithoutDebugger = DoubleQuotify("{'messageType': 'PipelineAgentJobRequest'}");
-
+        
         // Act
         using var stream = new MemoryStream();
         stream.Write(Encoding.UTF8.GetBytes(jsonWithoutDebugger));
         stream.Position = 0;
         var recoveredMessage = serializer.ReadObject(stream) as AgentJobRequestMessage;
-
+        
         // Assert
         Assert.NotNull(recoveredMessage);
         Assert.False(recoveredMessage.EnableDebugger, "EnableDebugger should default to false when JSON field is absent");
@@ -57,13 +57,13 @@ public sealed class AgentJobRequestMessageL0
         // Arrange
         var serializer = new DataContractJsonSerializer(typeof(AgentJobRequestMessage));
         string jsonWithDisabledDebugger = DoubleQuotify("{'EnableDebugger': false}");
-
+        
         // Act
         using var stream = new MemoryStream();
         stream.Write(Encoding.UTF8.GetBytes(jsonWithDisabledDebugger));
         stream.Position = 0;
         var recoveredMessage = serializer.ReadObject(stream) as AgentJobRequestMessage;
-
+        
         // Assert
         Assert.NotNull(recoveredMessage);
         Assert.False(recoveredMessage.EnableDebugger, "EnableDebugger should be false when JSON contains 'EnableDebugger': false");
@@ -161,26 +161,6 @@ public sealed class AgentJobRequestMessageL0
         Assert.Empty(recoveredMessage.ActionsDependencies);
     }
 
-    [Fact]
-    [Trait("Level", "L0")]
-    [Trait("Category", "Common")]
-    public void VerifyDebuggerWelcomeMessageRoundTrips()
-    {
-        // Arrange
-        var serializer = new DataContractJsonSerializer(typeof(AgentJobRequestMessage));
-        string json = DoubleQuotify("{'DebuggerWelcomeMessage': 'Welcome to debugging!'}");
-
-        // Act
-        using var stream = new MemoryStream();
-        stream.Write(Encoding.UTF8.GetBytes(json));
-        stream.Position = 0;
-        var recoveredMessage = serializer.ReadObject(stream) as AgentJobRequestMessage;
-
-        // Assert
-        Assert.NotNull(recoveredMessage);
-        Assert.Equal("Welcome to debugging!", recoveredMessage.DebuggerWelcomeMessage);
-    }
-
     private static string DoubleQuotify(string text)
     {
         return text.Replace('\'', '"');

src/Test/L0/Util/PathUtilL0.cs

@@ -0,0 +1,151 @@
+using GitHub.Runner.Sdk;
+using System.IO;
+using System.Runtime.InteropServices;
+using Xunit;
+
+namespace GitHub.Runner.Common.Tests.Util
+{
+    public sealed class PathUtilL0
+    {
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_ReturnsPath_WhenDirectoryDoesNotExist()
+        {
+            var fakePath = Path.Combine(Path.GetTempPath(), "nonexistent_" + Path.GetRandomFileName());
+            var result = PathUtil.GetCanonicalPath(fakePath);
+            Assert.Equal(fakePath, result);
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_ReturnsPath_WhenNull()
+        {
+            Assert.Null(PathUtil.GetCanonicalPath(null));
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_ReturnsEmpty_WhenEmpty()
+        {
+            Assert.Equal(string.Empty, PathUtil.GetCanonicalPath(string.Empty));
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_ReturnsValidPath_ForExistingDirectory()
+        {
+            var tempDir = Path.Combine(Path.GetTempPath(), "pathutil_test_" + Path.GetRandomFileName());
+            try
+            {
+                Directory.CreateDirectory(tempDir);
+                var result = PathUtil.GetCanonicalPath(tempDir);
+                Assert.NotNull(result);
+                Assert.True(Directory.Exists(result));
+            }
+            finally
+            {
+                if (Directory.Exists(tempDir))
+                {
+                    Directory.Delete(tempDir);
+                }
+            }
+        }
+
+#if OS_WINDOWS
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_NormalizesDriveLetter_OnWindows()
+        {
+            var tempDir = Path.GetTempPath().TrimEnd(Path.DirectorySeparatorChar);
+
+            // Skip if temp is a UNC path (no drive letter to normalize)
+            if (tempDir.StartsWith(@"\\"))
+            {
+                return;
+            }
+
+            // Force lowercase drive letter
+            var lowerCased = char.ToLower(tempDir[0]) + tempDir.Substring(1);
+
+            var result = PathUtil.GetCanonicalPath(lowerCased);
+
+            // The canonical path should have an uppercase drive letter
+            Assert.True(char.IsUpper(result[0]),
+                $"Expected uppercase drive letter but got: {result}");
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_NormalizesFolderCasing_OnWindows()
+        {
+            // Create a directory with known casing, then query with wrong casing
+            var basePath = Path.GetTempPath();
+            if (basePath.StartsWith(@"\\"))
+            {
+                return; // Skip UNC
+            }
+
+            var realName = "PathUtilTest_MiXeDcAsE_" + Path.GetRandomFileName();
+            var realDir = Path.Combine(basePath, realName);
+            try
+            {
+                Directory.CreateDirectory(realDir);
+
+                // Query with all-lowercase version
+                var wrongCased = Path.Combine(basePath, realName.ToLowerInvariant());
+
+                var result = PathUtil.GetCanonicalPath(wrongCased);
+
+                // The canonical result should contain the original mixed-case name
+                Assert.Contains(realName, result);
+            }
+            finally
+            {
+                if (Directory.Exists(realDir))
+                {
+                    Directory.Delete(realDir);
+                }
+            }
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_IsIdempotent_OnWindows()
+        {
+            // Calling GetCanonicalPath twice should return the same result
+            var tempDir = Path.GetTempPath().TrimEnd(Path.DirectorySeparatorChar);
+            var first = PathUtil.GetCanonicalPath(tempDir);
+            var second = PathUtil.GetCanonicalPath(first);
+            Assert.Equal(first, second);
+        }
+
+        [Fact]
+        [Trait("Level", "L0")]
+        [Trait("Category", "Common")]
+        public void GetCanonicalPath_ReturnsSameResult_RegardlessOfInputCasing_OnWindows()
+        {
+            var tempDir = Path.GetTempPath().TrimEnd(Path.DirectorySeparatorChar);
+            if (tempDir.StartsWith(@"\\"))
+            {
+                return; // Skip UNC
+            }
+
+            var upper = tempDir.ToUpperInvariant();
+            var lower = tempDir.ToLowerInvariant();
+
+            var resultUpper = PathUtil.GetCanonicalPath(upper);
+            var resultLower = PathUtil.GetCanonicalPath(lower);
+
+            // Both should resolve to the same canonical path
+            Assert.Equal(resultUpper, resultLower);
+        }
+#endif
+    }
+}

src/Test/L0/Worker/DapDebuggerL0.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using System.Net;
 using System.Net.Sockets;
@@ -11,9 +11,7 @@ using Moq;
 using GitHub.Runner.Worker;
 using GitHub.Runner.Worker.Dap;
 using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
 using Xunit;
-using Pipelines = GitHub.DistributedTask.Pipelines;
 
 namespace GitHub.Runner.Common.Tests.Worker
 {
@@ -238,7 +236,7 @@ namespace GitHub.Runner.Common.Tests.Worker
             }
         }
 
-        private static Mock<IExecutionContext> CreateJobContextWithTunnel(CancellationToken cancellationToken, ushort port, string jobName = null, bool overrideWelcomeMessage = false, string welcomeMessage = null)
+        private static Mock<IExecutionContext> CreateJobContextWithTunnel(CancellationToken cancellationToken, ushort port, string jobName = null)
         {
             var tunnel = new GitHub.DistributedTask.Pipelines.DebuggerTunnelInfo
             {
@@ -247,7 +245,7 @@ namespace GitHub.Runner.Common.Tests.Worker
                 HostToken = "test-token",
                 Port = port
             };
-            var debuggerConfig = new DebuggerConfig(true, tunnel, overrideWelcomeMessage, welcomeMessage);
+            var debuggerConfig = new DebuggerConfig(true, tunnel);
             var jobContext = new Mock<IExecutionContext>();
             jobContext.Setup(x => x.CancellationToken).Returns(cancellationToken);
             jobContext.Setup(x => x.Global).Returns(new GlobalContext { Debugger = debuggerConfig });
@@ -257,78 +255,6 @@ namespace GitHub.Runner.Common.Tests.Worker
             return jobContext;
         }
 
-        private static Mock<IStep> CreateStep(string displayName, ActionRunStage? stage = null)
-        {
-            var step = new Mock<IStep>();
-            step.Setup(s => s.DisplayName).Returns(displayName);
-            if (stage.HasValue)
-            {
-                var executionContext = new Mock<IExecutionContext>();
-                executionContext.Setup(x => x.Stage).Returns(stage.Value);
-                step.Setup(s => s.ExecutionContext).Returns(executionContext.Object);
-            }
-            else
-            {
-                step.Setup(s => s.ExecutionContext).Returns((IExecutionContext)null);
-            }
-
-            return step;
-        }
-
-        private static Mock<IActionRunner> CreateActionRunner(string displayName, ActionRunStage stage, Pipelines.ActionStep action)
-        {
-            var executionContext = new Mock<IExecutionContext>();
-            executionContext.Setup(x => x.Stage).Returns(stage);
-
-            var runner = new Mock<IActionRunner>();
-            runner.Setup(s => s.DisplayName).Returns(displayName);
-            runner.Setup(s => s.ExecutionContext).Returns(executionContext.Object);
-            runner.Setup(s => s.Stage).Returns(stage);
-            runner.Setup(s => s.Action).Returns(action);
-            return runner;
-        }
-
-        private static Pipelines.ActionStep CreateRepositoryActionStep(string name)
-        {
-            return new Pipelines.ActionStep
-            {
-                Id = Guid.NewGuid(),
-                Name = name,
-                Reference = new Pipelines.RepositoryPathReference
-                {
-                    Name = name,
-                    Ref = "v1",
-                    RepositoryType = Pipelines.RepositoryTypes.GitHub
-                }
-            };
-        }
-
-        private static Definition CreateActionDefinitionWithPost()
-        {
-            return new Definition
-            {
-                Data = new ActionDefinitionData
-                {
-                    Execution = new NodeJSActionExecutionData
-                    {
-                        Script = "main.js",
-                        Post = "post.js"
-                    }
-                }
-            };
-        }
-
-        private static Request MakeRequest(string command, object arguments)
-        {
-            return new Request
-            {
-                Seq = 1,
-                Type = "request",
-                Command = command,
-                Arguments = JObject.FromObject(arguments)
-            };
-        }
-
         [Fact]
         [Trait("Level", "L0")]
         [Trait("Category", "Worker")]
@@ -792,325 +718,6 @@ namespace GitHub.Runner.Common.Tests.Worker
             }
         }
 
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task HandleSourceReturnsJobStepsSource()
-        {
-            using (var hc = CreateTestContext())
-            {
-                hc.SecretMasker.AddValue("secret-step");
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                var waitTask = _debugger.WaitUntilReadyAsync();
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await waitTask;
-
-                var pre = CreateStep("Pre cache", ActionRunStage.Pre);
-                var checkout = CreateStep("Checkout");
-                var secret = CreateStep("secret-step");
-                var post = CreateStep("Post cache", ActionRunStage.Post);
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { pre.Object, checkout.Object, secret.Object },
-                    new[] { post.Object });
-
-                var response = _debugger.HandleSource(MakeRequest(
-                    "source",
-                    new SourceArguments { SourceReference = 1 }));
-
-                Assert.True(response.Success);
-                var body = Assert.IsType<SourceResponseBody>(response.Body);
-                Assert.Equal(
-                    "pre:\n  - step: \"Setup job\"\n  - step: \"Pre cache\"\n\nmain:\n  - step: \"Checkout\"\n  - step: \"***\"\n\npost:\n  - step: \"Post cache\"\n  - step: \"Complete job\"\n",
-                    body.Content);
-                Assert.Null(body.MimeType);
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task StackTraceUsesJobStepsSourceLine()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                var waitTask = _debugger.WaitUntilReadyAsync();
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await waitTask;
-
-                var checkout = CreateStep("Checkout");
-                var build = CreateStep("Build");
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { checkout.Object, build.Object },
-                    Array.Empty<IStep>());
-
-                var stepTask = _debugger.OnStepStartingAsync(build.Object);
-                var stoppedEvent = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"stopped\"", stoppedEvent);
-
-                var bannerEvent = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"output\"", bannerEvent);
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "stackTrace"
-                });
-
-                var stackTraceJson = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                var stackTrace = JObject.Parse(stackTraceJson);
-                var frame = stackTrace["body"]?["stackFrames"]?[0];
-
-                Assert.NotNull(frame);
-                Assert.Equal(6, frame["line"].Value<int>());
-                Assert.Equal(1, frame["source"]["sourceReference"].Value<int>());
-                Assert.Equal("execution.yml", frame["source"]["name"].Value<string>());
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 3,
-                    Type = "request",
-                    Command = "continue"
-                });
-                await stepTask;
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task StackTraceOmitsSourceForUnmappedCurrentStep()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                var waitTask = _debugger.WaitUntilReadyAsync();
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await waitTask;
-
-                var checkout = CreateStep("Checkout");
-                var build = CreateStep("Build");
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { checkout.Object },
-                    Array.Empty<IStep>());
-
-                var stepTask = _debugger.OnStepStartingAsync(build.Object);
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "stackTrace"
-                });
-
-                var stackTraceJson = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                var stackTrace = JObject.Parse(stackTraceJson);
-                var frame = stackTrace["body"]?["stackFrames"]?[0];
-
-                Assert.NotNull(frame);
-                Assert.Equal(0, frame["line"].Value<int>());
-                Assert.Null(frame["source"]);
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 3,
-                    Type = "request",
-                    Command = "continue"
-                });
-                await stepTask;
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task PredictedPostStepIsServedAtInitializationAndClaimedAtRegistration()
-        {
-            using (var hc = CreateTestContext())
-            {
-                var action = CreateRepositoryActionStep("actions/cache");
-                var actionManager = new Mock<IActionManager>();
-                actionManager
-                    .Setup(x => x.LoadAction(It.IsAny<IExecutionContext>(), action))
-                    .Returns(CreateActionDefinitionWithPost());
-                hc.SetSingleton<IActionManager>(actionManager.Object);
-
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                var waitTask = _debugger.WaitUntilReadyAsync();
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await waitTask;
-
-                var checkout = CreateActionRunner("Checkout", ActionRunStage.Main, action);
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { checkout.Object },
-                    Array.Empty<IStep>());
-
-                var sourceResponse = _debugger.HandleSource(MakeRequest(
-                    "source",
-                    new SourceArguments { SourceReference = 1 }));
-                var sourceBody = Assert.IsType<SourceResponseBody>(sourceResponse.Body);
-                Assert.Equal(
-                    "pre:\n  - step: \"Setup job\"\n\nmain:\n  - step: \"Checkout\"\n\npost:\n  - step: \"Post Checkout\"\n  - step: \"Complete job\"\n",
-                    sourceBody.Content);
-
-                var post = CreateActionRunner("Post Checkout", ActionRunStage.Post, action);
-                _debugger.OnPostStepRegistered(post.Object);
-
-                var stepTask = _debugger.OnStepStartingAsync(post.Object);
-                var stoppedEvent = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"stopped\"", stoppedEvent);
-
-                var bannerEvent = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"output\"", bannerEvent);
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "stackTrace"
-                });
-
-                var stackTraceJson = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                var stackTrace = JObject.Parse(stackTraceJson);
-                var frame = stackTrace["body"]?["stackFrames"]?[0];
-
-                Assert.NotNull(frame);
-                Assert.Equal(8, frame["line"].Value<int>());
-                Assert.Equal(1, frame["source"]["sourceReference"].Value<int>());
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 3,
-                    Type = "request",
-                    Command = "continue"
-                });
-                await stepTask;
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task StackTraceSanitizesSyntheticSourcePath()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port, jobName: "my/job\\name");
-                await _debugger.StartAsync(jobContext.Object);
-
-                var waitTask = _debugger.WaitUntilReadyAsync();
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await waitTask;
-
-                var checkout = CreateStep("Checkout");
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { checkout.Object },
-                    Array.Empty<IStep>());
-
-                var stepTask = _debugger.OnStepStartingAsync(checkout.Object);
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "stackTrace"
-                });
-
-                var stackTraceJson = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                var stackTrace = JObject.Parse(stackTraceJson);
-                var frame = stackTrace["body"]?["stackFrames"]?[0];
-
-                Assert.NotNull(frame);
-                Assert.Equal("my_job_name/execution.yml", frame["source"]["path"].Value<string>());
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 3,
-                    Type = "request",
-                    Command = "continue"
-                });
-                await stepTask;
-
-                await _debugger.StopAsync();
-            }
-        }
-
         [Fact]
         [Trait("Level", "L0")]
         [Trait("Category", "Worker")]
@@ -1135,15 +742,8 @@ namespace GitHub.Runner.Common.Tests.Worker
 
                 // Read the configurationDone response
                 await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                // Read the welcome message output event
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
                 await waitTask;
 
-                var checkout = CreateStep("Checkout");
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { checkout.Object },
-                    Array.Empty<IStep>());
-
                 // Complete the job — OnJobCompletedAsync pauses when stepping,
                 // so run it in the background and send continue to unblock.
                 var completedTask = _debugger.OnJobCompletedAsync();
@@ -1152,26 +752,10 @@ namespace GitHub.Runner.Common.Tests.Worker
                 var stoppedMsg = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
                 Assert.Contains("\"event\":\"stopped\"", stoppedMsg);
 
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "stackTrace"
-                });
-
-                var stackTraceJson = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                var stackTrace = JObject.Parse(stackTraceJson);
-                var frame = stackTrace["body"]?["stackFrames"]?[0];
-
-                Assert.NotNull(frame);
-                Assert.Equal("Complete job [completed]", frame["name"].Value<string>());
-                Assert.Equal(8, frame["line"].Value<int>());
-                Assert.Equal(1, frame["source"]["sourceReference"].Value<int>());
-
                 // Send continue to unblock the pause
                 await SendRequestAsync(stream, new Request
                 {
-                    Seq = 3,
+                    Seq = 2,
                     Type = "request",
                     Command = "continue"
                 });
@@ -1191,68 +775,6 @@ namespace GitHub.Runner.Common.Tests.Worker
             }
         }
 
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task OnJobCompletedUsesSyntheticCompleteJobLineWhenPostStepSharesName()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                var waitTask = _debugger.WaitUntilReadyAsync();
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                await waitTask;
-
-                var checkout = CreateStep("Checkout");
-                var realPost = CreateStep("Complete job", ActionRunStage.Post);
-                await _debugger.OnJobStepsInitializedAsync(
-                    new[] { checkout.Object },
-                    new[] { realPost.Object });
-
-                var completedTask = _debugger.OnJobCompletedAsync();
-
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "stackTrace"
-                });
-
-                var stackTraceJson = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                var stackTrace = JObject.Parse(stackTraceJson);
-                var frame = stackTrace["body"]?["stackFrames"]?[0];
-
-                Assert.NotNull(frame);
-                Assert.Equal("Complete job [completed]", frame["name"].Value<string>());
-                Assert.Equal(9, frame["line"].Value<int>());
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 3,
-                    Type = "request",
-                    Command = "continue"
-                });
-
-                await completedTask;
-            }
-        }
-
         [Fact]
         [Trait("Level", "L0")]
         [Trait("Category", "Worker")]
@@ -1327,8 +849,6 @@ namespace GitHub.Runner.Common.Tests.Worker
                     Command = "configurationDone"
                 });
 
-                await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                // Read the welcome message output event
                 await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
                 await waitTask;
 
@@ -1347,224 +867,5 @@ namespace GitHub.Runner.Common.Tests.Worker
                 Assert.Equal(completedTask, finished);
             }
         }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task WelcomeMessageSendsDefaultHelpWhenOverrideDisabled()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                // First message: configurationDone response
-                var configDoneResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"configurationDone\"", configDoneResponse);
-
-                // Second message: welcome output event with default help text
-                var welcomeMsg = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"output\"", welcomeMsg);
-                Assert.Contains("\"category\":\"console\"", welcomeMsg);
-                Assert.Contains("Actions Debug Console", welcomeMsg);
-                Assert.Contains("help", welcomeMsg);
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task WelcomeMessageShowsCustomMessageWhenOverrideEnabled()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port,
-                    overrideWelcomeMessage: true,
-                    welcomeMessage: "Welcome to debugging!");
-                await _debugger.StartAsync(jobContext.Object);
-
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                // First: configurationDone response
-                var configDoneResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"configurationDone\"", configDoneResponse);
-
-                // Second: custom welcome message
-                var welcomeMsg = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"output\"", welcomeMsg);
-                Assert.Contains("Welcome to debugging!", welcomeMsg);
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task WelcomeMessageSuppressedWhenOverrideEnabledWithEmptyMessage()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port,
-                    overrideWelcomeMessage: true,
-                    welcomeMessage: "");
-                await _debugger.StartAsync(jobContext.Object);
-
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                // Read configurationDone response
-                var configDoneResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"configurationDone\"", configDoneResponse);
-
-                // Send threads request — if welcome message was suppressed, this
-                // should be the next response (no output event in between)
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "threads"
-                });
-
-                var threadsResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"threads\"", threadsResponse);
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task WelcomeMessageSuppressedWhenOverrideEnabledWithNullMessage()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port,
-                    overrideWelcomeMessage: true,
-                    welcomeMessage: null);
-                await _debugger.StartAsync(jobContext.Object);
-
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                // Read configurationDone response
-                var configDoneResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"configurationDone\"", configDoneResponse);
-
-                // Send threads request — if welcome message was suppressed, this
-                // should be the next response (no output event in between)
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "threads"
-                });
-
-                var threadsResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"threads\"", threadsResponse);
-
-                await _debugger.StopAsync();
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public async Task WelcomeMessageSentOnlyOnce()
-        {
-            using (CreateTestContext())
-            {
-                var port = GetFreePort();
-                using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
-                var jobContext = CreateJobContextWithTunnel(cts.Token, port);
-                await _debugger.StartAsync(jobContext.Object);
-
-                using var client = await ConnectClientAsync(port);
-                var stream = client.GetStream();
-
-                // First configurationDone
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 1,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                var configDoneResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"configurationDone\"", configDoneResponse);
-
-                // Welcome message should appear
-                var welcomeMsg = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"event\":\"output\"", welcomeMsg);
-                Assert.Contains("Actions Debug Console", welcomeMsg);
-
-                // Second configurationDone — should NOT produce another welcome message
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 2,
-                    Type = "request",
-                    Command = "configurationDone"
-                });
-
-                var secondResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"configurationDone\"", secondResponse);
-
-                // Next message should be threads response, not another welcome output
-                await SendRequestAsync(stream, new Request
-                {
-                    Seq = 3,
-                    Type = "request",
-                    Command = "threads"
-                });
-
-                var threadsResponse = await ReadDapMessageAsync(stream, TimeSpan.FromSeconds(5));
-                Assert.Contains("\"command\":\"threads\"", threadsResponse);
-
-                await _debugger.StopAsync();
-            }
-        }
     }
 }

src/Test/L0/Worker/DapMessagesL0.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Xunit;
@@ -171,36 +171,6 @@ namespace GitHub.Runner.Common.Tests.Worker
             Assert.Equal("normal", deserialized.PresentationHint);
         }
 
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void SourceRequestAndResponseSerialization()
-        {
-            var args = new SourceArguments
-            {
-                Source = new Source
-                {
-                    SourceReference = 1
-                }
-            };
-
-            var argsJson = JsonConvert.SerializeObject(args);
-            var deserializedArgs = JsonConvert.DeserializeObject<SourceArguments>(argsJson);
-
-            Assert.Equal(1, deserializedArgs.Source.SourceReference);
-
-            var body = new SourceResponseBody
-            {
-                Content = "pre:\n  - step: \"Setup job\"\n\nmain:\n  - step: \"Checkout\"\n\npost:\n  - step: \"Complete job\"\n"
-            };
-
-            var bodyJson = JsonConvert.SerializeObject(body);
-            var deserializedBody = JsonConvert.DeserializeObject<SourceResponseBody>(bodyJson);
-
-            Assert.Equal("pre:\n  - step: \"Setup job\"\n\nmain:\n  - step: \"Checkout\"\n\npost:\n  - step: \"Complete job\"\n", deserializedBody.Content);
-            Assert.Null(deserializedBody.MimeType);
-        }
-
         [Fact]
         [Trait("Level", "L0")]
         [Trait("Category", "Worker")]

src/Test/L0/Worker/DapReplExecutorL0.cs

@@ -5,12 +5,9 @@ using System.Threading;
 using System.Threading.Tasks;
 using GitHub.DistributedTask.Expressions2;
 using GitHub.DistributedTask.Pipelines.ContextData;
-using GitHub.DistributedTask.WebApi;
 using GitHub.Runner.Common.Tests;
 using GitHub.Runner.Worker;
-using GitHub.Runner.Worker.Container;
 using GitHub.Runner.Worker.Dap;
-using GitHub.Runner.Worker.Handlers;
 using Moq;
 using Xunit;
 
@@ -43,8 +40,7 @@ namespace GitHub.Runner.Common.Tests.Worker
 
         private Mock<IExecutionContext> CreateMockContext(
             DictionaryContextData exprValues = null,
-            IDictionary<string, IDictionary<string, string>> jobDefaults = null,
-            ContainerInfo container = null)
+            IDictionary<string, IDictionary<string, string>> jobDefaults = null)
         {
             var mock = new Mock<IExecutionContext>();
             mock.Setup(x => x.ExpressionValues).Returns(exprValues ?? new DictionaryContextData());
@@ -55,7 +51,6 @@ namespace GitHub.Runner.Common.Tests.Worker
                 PrependPath = new List<string>(),
                 JobDefaults = jobDefaults
                     ?? new Dictionary<string, IDictionary<string, string>>(StringComparer.OrdinalIgnoreCase),
-                Container = container,
             };
             mock.Setup(x => x.Global).Returns(global);
 
@@ -70,7 +65,7 @@ namespace GitHub.Runner.Common.Tests.Worker
             using (CreateTestContext())
             {
                 var command = new RunCommand { Script = "echo hello" };
-                var result = await _executor.ExecuteRunCommandAsync(command, null, false, CancellationToken.None);
+                var result = await _executor.ExecuteRunCommandAsync(command, null, CancellationToken.None);
 
                 Assert.Equal("error", result.Type);
                 Assert.Contains("No execution context available", result.Result);
@@ -238,101 +233,5 @@ namespace GitHub.Runner.Common.Tests.Worker
                 Assert.False(result.ContainsKey("BAZ"));
             }
         }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void CreateStepHost_NoContainer_ReturnsDefaultStepHost()
-        {
-            using (var hc = CreateTestContext())
-            {
-                hc.EnqueueInstance<IDefaultStepHost>(new DefaultStepHost());
-                var context = CreateMockContext();
-                var result = _executor.CreateStepHost(context.Object, isActionStep: true);
-
-                Assert.IsType<DefaultStepHost>(result);
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void CreateStepHost_WithContainer_ActionStep_ReturnsContainerStepHost()
-        {
-            using (var hc = CreateTestContext())
-            {
-                hc.EnqueueInstance<IContainerStepHost>(new ContainerStepHost());
-                var container = new ContainerInfo { ContainerId = "abc123" };
-                var context = CreateMockContext(container: container);
-                var result = _executor.CreateStepHost(context.Object, isActionStep: true);
-
-                Assert.IsType<ContainerStepHost>(result);
-                var containerHost = (ContainerStepHost)result;
-                Assert.Same(container, containerHost.Container);
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void CreateStepHost_WithContainer_InfrastructureStep_ReturnsDefaultStepHost()
-        {
-            using (var hc = CreateTestContext())
-            {
-                hc.EnqueueInstance<IDefaultStepHost>(new DefaultStepHost());
-                var container = new ContainerInfo { ContainerId = "abc123" };
-                var context = CreateMockContext(container: container);
-                var result = _executor.CreateStepHost(context.Object, isActionStep: false);
-
-                Assert.IsType<DefaultStepHost>(result);
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void CreateStepHost_ContainerWithoutId_NoHooks_ReturnsDefaultStepHost()
-        {
-            using (var hc = CreateTestContext())
-            {
-                hc.EnqueueInstance<IDefaultStepHost>(new DefaultStepHost());
-                // Container exists but hasn't been started yet (no ContainerId)
-                var container = new ContainerInfo();
-                var context = CreateMockContext(container: container);
-                var result = _executor.CreateStepHost(context.Object, isActionStep: true);
-
-                Assert.IsType<DefaultStepHost>(result);
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void CreateStepHost_ContainerWithoutId_HooksEnabled_ReturnsContainerStepHost()
-        {
-            using (var hc = CreateTestContext())
-            {
-                hc.EnqueueInstance<IContainerStepHost>(new ContainerStepHost());
-                // Container hooks need both the feature flag and the env var
-                Environment.SetEnvironmentVariable("ACTIONS_RUNNER_CONTAINER_HOOKS", "/some/hook/path");
-                try
-                {
-                    var container = new ContainerInfo();
-                    var context = CreateMockContext(container: container);
-                    context.Object.Global.Variables = new Variables(
-                        hc,
-                        new Dictionary<string, VariableValue>
-                        {
-                            { Constants.Runner.Features.AllowRunnerContainerHooks, new VariableValue("true") }
-                        });
-                    var result = _executor.CreateStepHost(context.Object, isActionStep: true);
-                    Assert.IsAssignableFrom<IContainerStepHost>(result);
-                }
-                finally
-                {
-                    Environment.SetEnvironmentVariable("ACTIONS_RUNNER_CONTAINER_HOOKS", null);
-                }
-            }
-        }
     }
 }

src/Test/L0/Worker/ExecutionContextL0.cs

@@ -361,119 +361,6 @@ namespace GitHub.Runner.Common.Tests.Worker
             }
         }
 
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void RegisterPostJobStep_JobExtensionRunner_DefaultsRunnerTelemetry()
-        {
-            using (TestHostContext hc = CreateTestContext())
-            {
-                // Arrange: Create a job request message.
-                TaskOrchestrationPlanReference plan = new();
-                TimelineReference timeline = new();
-                Guid jobId = Guid.NewGuid();
-                string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null, null);
-                jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
-                {
-                    Alias = Pipelines.PipelineConstants.SelfAlias,
-                    Id = "github",
-                    Version = "sha1"
-                });
-                jobRequest.ContextData["github"] = new Pipelines.ContextData.DictionaryContextData();
-
-                var pagingLogger1 = new Mock<IPagingLogger>();
-                var pagingLogger2 = new Mock<IPagingLogger>();
-                var jobServerQueue = new Mock<IJobServerQueue>();
-                jobServerQueue.Setup(x => x.QueueTimelineRecordUpdate(It.IsAny<Guid>(), It.IsAny<TimelineRecord>()));
-
-                hc.EnqueueInstance(pagingLogger1.Object);
-                hc.EnqueueInstance(pagingLogger2.Object);
-                hc.SetSingleton(jobServerQueue.Object);
-
-                var jobContext = new Runner.Worker.ExecutionContext();
-                jobContext.Initialize(hc);
-
-                // Act.
-                jobContext.InitializeJob(jobRequest, CancellationToken.None);
-
-                var extensionStep = new JobExtensionRunner(
-                    runAsync: (_, _) => System.Threading.Tasks.Task.CompletedTask,
-                    condition: "always()",
-                    displayName: "Create Custom Image",
-                    data: null);
-
-                jobContext.RegisterPostJobStep(extensionStep);
-
-                // Assert: telemetry defaults are populated for non-action post-job steps.
-                Assert.NotNull(extensionStep.ExecutionContext);
-                Assert.Equal("runner", extensionStep.ExecutionContext.StepTelemetry.Type);
-                Assert.Equal("create_custom_image", extensionStep.ExecutionContext.StepTelemetry.Action);
-            }
-        }
-
-        [Fact]
-        [Trait("Level", "L0")]
-        [Trait("Category", "Worker")]
-        public void RegisterPostJobStep_ActionRunner_DoesNotOverrideTelemetry()
-        {
-            using (TestHostContext hc = CreateTestContext())
-            {
-                // Arrange: Create a job request message.
-                TaskOrchestrationPlanReference plan = new();
-                TimelineReference timeline = new();
-                Guid jobId = Guid.NewGuid();
-                string jobName = "some job name";
-                var jobRequest = new Pipelines.AgentJobRequestMessage(plan, timeline, jobId, jobName, jobName, null, null, null, new Dictionary<string, VariableValue>(), new List<MaskHint>(), new Pipelines.JobResources(), new Pipelines.ContextData.DictionaryContextData(), new Pipelines.WorkspaceOptions(), new List<Pipelines.ActionStep>(), null, null, null, null, null);
-                jobRequest.Resources.Repositories.Add(new Pipelines.RepositoryResource()
-                {
-                    Alias = Pipelines.PipelineConstants.SelfAlias,
-                    Id = "github",
-                    Version = "sha1"
-                });
-                jobRequest.ContextData["github"] = new Pipelines.ContextData.DictionaryContextData();
-
-                var pagingLogger1 = new Mock<IPagingLogger>();
-                var pagingLogger2 = new Mock<IPagingLogger>();
-                var pagingLogger3 = new Mock<IPagingLogger>();
-                var pagingLogger4 = new Mock<IPagingLogger>();
-                var jobServerQueue = new Mock<IJobServerQueue>();
-                jobServerQueue.Setup(x => x.QueueTimelineRecordUpdate(It.IsAny<Guid>(), It.IsAny<TimelineRecord>()));
-
-                var actionRunner = new ActionRunner();
-                actionRunner.Initialize(hc);
-
-                hc.EnqueueInstance(pagingLogger1.Object);
-                hc.EnqueueInstance(pagingLogger2.Object);
-                hc.EnqueueInstance(pagingLogger3.Object);
-                hc.EnqueueInstance(pagingLogger4.Object);
-                hc.EnqueueInstance(actionRunner as IActionRunner);
-                hc.SetSingleton(jobServerQueue.Object);
-
-                var jobContext = new Runner.Worker.ExecutionContext();
-                jobContext.Initialize(hc);
-
-                // Act.
-                jobContext.InitializeJob(jobRequest, CancellationToken.None);
-
-                var action = jobContext.CreateChild(Guid.NewGuid(), "action", "action", null, null, 0);
-
-                var postRunner = hc.CreateService<IActionRunner>();
-                postRunner.Action = new Pipelines.ActionStep() { Id = Guid.NewGuid(), Name = "post", DisplayName = "Post Action", Reference = new Pipelines.RepositoryPathReference() { Name = "actions/action" } };
-                postRunner.Stage = ActionRunStage.Post;
-                postRunner.Condition = "always()";
-                postRunner.DisplayName = "Post Action";
-
-                action.RegisterPostJobStep(postRunner);
-
-                // Assert: action post-step telemetry is left for the handler to fill in,
-                // so RegisterPostJobStep should NOT pre-populate runner-owned defaults.
-                Assert.NotNull(postRunner.ExecutionContext);
-                Assert.Null(postRunner.ExecutionContext.StepTelemetry.Type);
-                Assert.Null(postRunner.ExecutionContext.StepTelemetry.Action);
-            }
-        }
-
         [Fact]
         [Trait("Level", "L0")]
         [Trait("Category", "Worker")]

src/dev.sh

@@ -17,7 +17,7 @@ LAYOUT_DIR="$SCRIPT_DIR/../_layout"
 DOWNLOAD_DIR="$SCRIPT_DIR/../_downloads/netcore2x"
 PACKAGE_DIR="$SCRIPT_DIR/../_package"
 DOTNETSDK_ROOT="$SCRIPT_DIR/../_dotnetsdk"
-DOTNETSDK_VERSION="8.0.421"
+DOTNETSDK_VERSION="8.0.420"
 DOTNETSDK_INSTALLDIR="$DOTNETSDK_ROOT/$DOTNETSDK_VERSION"
 RUNNER_VERSION=$(cat runnerversion)
 

src/global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "8.0.421"
+    "version": "8.0.420"
   }
 }