feat(queue): warn when the base branch has uncommitted changes

Queuing (update_task_status, batch_update_task_status) and run_task_now
now surface a non-blocking baseDirty warning (separate modified/untracked
counts) when the list's working dir has uncommitted changes at enqueue
time, since a new worktree forks from the commit tip and silently misses
them. BaseDirtyChecker caches per working dir for a few seconds so a
batch queue over many tasks in one list only shells out to git once. The
UI surfaces the same warning via the footer error strip on queue actions.

src/ClaudeDo.Localization/locales/de.json

@@ -659,6 +659,7 @@
     "taskStatus": { "idle": "Leerlauf", "queued": "In Warteschlange", "running": "Läuft", "waitingForReview": "Wartet auf Prüfung", "waitingForChildren": "Wartet auf Teilaufgaben", "done": "Fertig", "failed": "Fehlgeschlagen", "cancelled": "Abgebrochen", "parked": "Geparkt", "interactive": "Interaktiv" },
     "planningBadge": { "active": "PLANUNG", "finalized": "GEPLANT" },
     "taskRow": { "createdPrefix": "Erstellt {0}", "stepsText": "{0}/{1} Schritte" },
+    "queue": { "baseDirtyWarning": "Achtung: Das Repo dieser Liste hat uncommittete Änderungen ({0} geändert, {1} untracked) — ein neuer Worktree startet vom letzten Commit und enthält sie nicht." },
     "tasksIsland": { "completedHeader": "ABGESCHLOSSEN", "completedHeaderCount": "ABGESCHLOSSEN · {0}", "planningOpenFailed": "Planungssitzung konnte nicht geöffnet werden: {0}", "planningResumeFailed": "Planungssitzung konnte nicht fortgesetzt werden: {0}", "approveFailed": "Genehmigen & Mergen fehlgeschlagen: {0}", "cancelReviewFailed": "Prüfung abbrechen fehlgeschlagen: {0}", "sendToQueueFailed": "In die Warteschlange stellen fehlgeschlagen: {0}", "queuePlanBlockedInteractive": "Plan kann nicht in die Warteschlange gestellt werden — {0} hat eine offene interaktive Sitzung und muss zuerst geschlossen werden.", "moveRunningRejected": "Ein laufender Task kann nicht in eine andere Liste verschoben werden.", "moveWorktreeRejected": "Verschieben nicht möglich — dieser Task hat einen aktiven Worktree, der auf sein aktuelles Repo zeigt.", "moveRepoConfirm": "Unterschiedliche Repos — {0} → {1}. Task trotzdem verschieben?", "moveConfirmUnavailable": "Verschieben nicht möglich — der Bestätigungsdialog ist nicht verfügbar.", "quickClaudeNoWorkingDir": "Für diese Liste ist kein Arbeitsverzeichnis konfiguriert.", "quickClaudeDirMissing": "Arbeitsverzeichnis existiert nicht mehr: {0}" },
     "diff": { "loadFailed": "Diff konnte nicht geladen werden: {0}", "noChanges": "Keine Änderungen anzuzeigen.", "unavailable": "Diff nicht mehr verfügbar — Commit-Bereich unvollständig." },
     "planningDiff": { "hubError": "Kombinierte Vorschau konnte nicht erstellt werden (Hub-Fehler).", "conflict": "Kombinierte Vorschau nicht möglich: Teilaufgabe {0} steht im Konflikt mit einer früheren Teilaufgabe ({1} Dateien).", "buildFailed": "Kombinierte Vorschau konnte nicht erstellt werden: {0}" },

src/ClaudeDo.Localization/locales/en.json

@@ -659,6 +659,7 @@
     "taskStatus": { "idle": "Idle", "queued": "Queued", "running": "Running", "waitingForReview": "Waiting for Review", "waitingForChildren": "Waiting for Subtasks", "done": "Done", "failed": "Failed", "cancelled": "Cancelled", "parked": "Parked", "interactive": "Interactive" },
     "planningBadge": { "active": "PLANNING", "finalized": "PLANNED" },
     "taskRow": { "createdPrefix": "Created {0}", "stepsText": "{0}/{1} steps" },
+    "queue": { "baseDirtyWarning": "Heads up: this list's repo has uncommitted changes ({0} modified, {1} untracked) — a new worktree starts from the last commit and won't include them." },
     "tasksIsland": { "completedHeader": "COMPLETED", "completedHeaderCount": "COMPLETED · {0}", "planningOpenFailed": "Couldn't open planning session: {0}", "planningResumeFailed": "Couldn't resume planning session: {0}", "approveFailed": "Approve & merge failed: {0}", "cancelReviewFailed": "Cancel review failed: {0}", "sendToQueueFailed": "Send to queue failed: {0}", "queuePlanBlockedInteractive": "Can't queue the plan — {0} has an open interactive session and must be closed first.", "moveRunningRejected": "Can't move a running task to another list.", "moveWorktreeRejected": "Can't move — this task has an active worktree pointing at its current repo.", "moveRepoConfirm": "Different repos — {0} → {1}. Move the task anyway?", "moveConfirmUnavailable": "Can't move — the confirmation dialog isn't available.", "quickClaudeNoWorkingDir": "This list has no working directory configured.", "quickClaudeDirMissing": "Working directory no longer exists: {0}" },
     "diff": { "loadFailed": "Failed to load diff: {0}", "noChanges": "No changes to show.", "unavailable": "Diff no longer available — commit range incomplete." },
     "planningDiff": { "hubError": "Could not build combined preview (hub error).", "conflict": "Cannot build combined preview: subtask {0} conflicts with an earlier subtask ({1} files).", "buildFailed": "Could not build combined preview: {0}" },

src/ClaudeDo.Ui/Services/Interfaces/IWorkerClient.cs

@@ -75,7 +75,10 @@ public interface IWorkerClient : INotifyPropertyChanged
     Task<List<string>> InstallSessionSkillAsync(string url);
     Task UpdateSessionSkillAsync(string sourceUrl);
     Task RemoveSessionSkillAsync(string sourceUrl);
-    Task SetTaskStatusAsync(string taskId, TaskStatus status);
+    /// <summary>Returns the base-dirty heads-up when this transition just queued the task against
+    /// a list whose working dir has uncommitted changes (null otherwise) — a new worktree forks
+    /// from the last commit, not the working tree, so those changes won't be included.</summary>
+    Task<BaseDirtyWarningDto?> SetTaskStatusAsync(string taskId, TaskStatus status);
     Task<MergeResultDto?> ApproveReviewAsync(string taskId, string targetBranch);
     Task<MergePreviewDto?> PreviewMergeAsync(string taskId, string targetBranch);
     Task<MergeResultDto> MergeTaskAsync(string taskId, string targetBranch, bool removeWorktree, string commitMessage);

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -483,9 +483,10 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     public Task RemoveSessionSkillAsync(string sourceUrl)
         => _hub.InvokeAsync("RemoveSessionSkill", sourceUrl);
 
-    public async Task SetTaskStatusAsync(string taskId, ClaudeDo.Data.Models.TaskStatus status)
+    public async Task<BaseDirtyWarningDto?> SetTaskStatusAsync(string taskId, ClaudeDo.Data.Models.TaskStatus status)
     {
-        await _hub.InvokeAsync("SetTaskStatus", taskId, status.ToString());
+        var result = await _hub.InvokeAsync<SetTaskStatusResultDto>("SetTaskStatus", taskId, status.ToString());
+        return result?.BaseDirty;
     }
 
     public async Task<MergeResultDto?> ApproveReviewAsync(string taskId, string targetBranch)
@@ -690,6 +691,8 @@ public sealed record SessionSkillDto(
 public sealed record WorktreeCleanupDto(int Removed);
 public sealed record WorktreeResetDto(int Removed, int TasksAffected, bool Blocked, int RunningTasks);
 public record MergeResultDto(string Status, IReadOnlyList<string> ConflictFiles, string? ErrorMessage);
+public record BaseDirtyWarningDto(int ModifiedCount, int UntrackedCount);
+public record SetTaskStatusResultDto(BaseDirtyWarningDto? BaseDirty);
 public record MergePreviewDto(string Status, IReadOnlyList<string> ConflictFiles, int ChangedFileCount);
 public record MergeTargetsDto(string DefaultBranch, IReadOnlyList<string> LocalBranches);
 public record MergeConflictDocumentsDto(string TaskId, IReadOnlyList<ConflictDocumentDto> Files);

src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs

@@ -1097,12 +1097,20 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         if (Task == null) return;
         try
         {
-            await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
+            var baseDirty = await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
             AgentState = "queued";
+            ReportBaseDirty(baseDirty);
         }
         catch { /* offline */ }
     }
 
+    private void ReportBaseDirty(BaseDirtyWarningDto? warning)
+    {
+        if (warning is null) return;
+        ErrorReported?.Invoke(Loc.T(
+            "vm.queue.baseDirtyWarning", warning.ModifiedCount, warning.UntrackedCount));
+    }
+
     private bool CanEnqueue() =>
         Task != null && _worker.IsConnected && IsIdle
         && (!Task.IsChild || Task.ParentFinalized);
@@ -1168,8 +1176,9 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
 
         try
         {
-            await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
+            var baseDirty = await _worker.SetTaskStatusAsync(Task.Id, ClaudeDo.Data.Models.TaskStatus.Queued);
             AgentState = "queued";
+            ReportBaseDirty(baseDirty);
         }
         catch { /* offline */ }
     }

src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs

@@ -860,10 +860,21 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
     public async Task SetStatusOnRowAsync(TaskRowViewModel row, TaskStatus status)
     {
         if (_worker is null) return;
-        try { await _worker.SetTaskStatusAsync(row.Id, status); }
+        try
+        {
+            var baseDirty = await _worker.SetTaskStatusAsync(row.Id, status);
+            ReportBaseDirty(baseDirty);
+        }
         catch { /* offline; broadcast won't fire */ }
     }
 
+    private void ReportBaseDirty(BaseDirtyWarningDto? warning)
+    {
+        if (warning is null) return;
+        ErrorReported?.Invoke(Loc.T(
+            "vm.queue.baseDirtyWarning", warning.ModifiedCount, warning.UntrackedCount));
+    }
+
     [RelayCommand]
     private async Task SendToQueueAsync(TaskRowViewModel? row)
     {
@@ -890,7 +901,11 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         // Goes through the worker hub (TaskStateService.EnqueueAsync) rather than a raw EF write
         // so the manual/draft-child guards apply here too; the row refreshes from the resulting
         // TaskUpdated broadcast.
-        try { await _worker.SetTaskStatusAsync(row.Id, TaskStatus.Queued); }
+        try
+        {
+            var baseDirty = await _worker.SetTaskStatusAsync(row.Id, TaskStatus.Queued);
+            ReportBaseDirty(baseDirty);
+        }
         catch (Exception ex) { ErrorReported?.Invoke(Loc.T("vm.tasksIsland.sendToQueueFailed", ex.Message)); }
     }
 

src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs

@@ -131,7 +131,13 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
     {
         if (string.IsNullOrEmpty(taskId)) return;
         if (ConPtySessions.Any(s => s.TaskId == taskId)) return;
-        try { await _worker.SetTaskStatusAsync(taskId, ClaudeDo.Data.Models.TaskStatus.Queued); }
+        try
+        {
+            var baseDirty = await _worker.SetTaskStatusAsync(taskId, ClaudeDo.Data.Models.TaskStatus.Queued);
+            if (baseDirty is not null)
+                ErrorReported?.Invoke(Loc.T(
+                    "vm.queue.baseDirtyWarning", baseDirty.ModifiedCount, baseDirty.UntrackedCount));
+        }
         catch { /* best-effort enqueue */ }
         await RefreshQueueAsync();
     }

src/ClaudeDo.Worker/External/BatchMcpTools.cs

@@ -1,4 +1,5 @@
 using System.ComponentModel;
+using ClaudeDo.Worker.Git;
 using ModelContextProtocol.Server;
 
 namespace ClaudeDo.Worker.External;
@@ -19,7 +20,9 @@ public sealed record BatchGetTaskResult(string Id, bool Found, TaskRefDto? Task,
 public sealed record BatchAddTaskResult(
     int Index, string Title, bool Ok, TaskRefDto? Task,
     IReadOnlyList<PossibleDuplicateDto>? PossibleDuplicates, string? Error);
-public sealed record BatchTaskResult(string TaskId, bool Ok, string? Error);
+// BaseDirty mirrors TaskRefDto.BaseDirty: populated only for BatchUpdateTaskStatus items that
+// just transitioned to Queued against a list whose working dir has uncommitted changes.
+public sealed record BatchTaskResult(string TaskId, bool Ok, string? Error, DirtyBaseWarning? BaseDirty = null);
 public sealed record BatchCancelResult(string TaskId, bool Ok, bool Cancelled, string? Error);
 public sealed record BatchCleanupResult(string TaskId, bool Ok, bool Removed, bool BranchDeleted, string? Error);
 
@@ -116,7 +119,10 @@ public sealed class BatchMcpTools
 
     [McpServerTool, Description(
         "Set the status of many tasks at once — use for bulk queue/cancel/done actions instead of calling " +
-        "update_task_status per task. 'Done' is refused per-item for a task with an active worktree." +
+        "update_task_status per task. 'Done' is refused per-item for a task with an active worktree. " +
+        "baseDirty on a 'Queued' item means that task's list has uncommitted changes in its working dir right " +
+        "now — a new worktree forks from the last commit and won't include them; non-blocking, but worth " +
+        "checking before assuming a fresh worktree starts from what's on disk." +
         McpToolDocs.MaxBatch)]
     public async Task<IReadOnlyList<BatchTaskResult>> BatchUpdateTaskStatus(
         string[] taskIds,
@@ -124,8 +130,22 @@ public sealed class BatchMcpTools
         CancellationToken cancellationToken)
     {
         EnsureWithinCap(taskIds, nameof(taskIds));
-        return await RunPerTaskAsync(taskIds,
-            (id, ct) => _svc.UpdateTaskStatus(id, status, ct), cancellationToken);
+
+        var results = new List<BatchTaskResult>(taskIds.Length);
+        foreach (var id in taskIds)
+        {
+            try
+            {
+                var task = await _svc.UpdateTaskStatus(id, status, cancellationToken);
+                results.Add(new BatchTaskResult(id, true, null, task.BaseDirty));
+            }
+            catch (OperationCanceledException) { throw; }
+            catch (Exception ex)
+            {
+                results.Add(new BatchTaskResult(id, false, ex.Message));
+            }
+        }
+        return results;
     }
 
     [McpServerTool, Description(

src/ClaudeDo.Worker/External/ExternalMcpService.cs

@@ -7,6 +7,7 @@ using ClaudeDo.Data;
 using ClaudeDo.Data.Git;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Planning;
@@ -26,7 +27,7 @@ public sealed record CancelTaskResult(bool Cancelled, string Id);
 // review range (worktree ahead, or HandlerBaseCommit..HandlerHeadCommit for a worktree-less
 // child) contributed nothing, so a reviewer sees them before approving instead of after.
 public sealed record ReviewTaskResult(TaskRefDto Task, string? MergeStatus, IReadOnlyList<string> MergeConflicts, string? MergeMessage, string? RepoPath = null, IReadOnlyList<TaskRefDto>? EmptyChildren = null);
-public sealed record RunTaskNowResult(bool Started, string TaskId);
+public sealed record RunTaskNowResult(bool Started, string TaskId, DirtyBaseWarning? BaseDirty = null);
 
 public sealed record TaskDto(
     string Id,
@@ -49,6 +50,9 @@ public sealed record TaskDto(
 
 // Lean counterpart to TaskDto for writing/status-changing tools: echoes back what changed
 // without re-sending Description/Result, which the caller just sent or already has.
+// BaseDirty is populated only where the task just transitioned to Queued (or ran immediately
+// via run_task_now) and its list's working directory has uncommitted changes -- see
+// ClaudeDo.Worker.Git.BaseDirtyChecker. Every other caller leaves it null.
 public sealed record TaskRefDto(
     string Id,
     string ListId,
@@ -56,7 +60,8 @@ public sealed record TaskRefDto(
     string Status,
     int SortOrder,
     bool IsMyDay,
-    int RoadblockCount = 0);
+    int RoadblockCount = 0,
+    DirtyBaseWarning? BaseDirty = null);
 
 // tasks is populated when includeDescription=false (the default): lean references, no
 // Description/Result. tasksFull is populated when includeDescription=true: full tasks incl.
@@ -135,6 +140,7 @@ public sealed class ExternalMcpService
     private readonly WorktreeMaintenanceService _maintenance;
     private readonly TaskMergeService _merge;
     private readonly PlanningMergeOrchestrator _planningMerge;
+    private readonly IBaseDirtyChecker _baseDirtyChecker;
 
     public ExternalMcpService(
         TaskRepository tasks,
@@ -146,7 +152,8 @@ public sealed class ExternalMcpService
         IDbContextFactory<ClaudeDoDbContext> dbFactory,
         WorktreeMaintenanceService maintenance,
         TaskMergeService merge,
-        PlanningMergeOrchestrator planningMerge)
+        PlanningMergeOrchestrator planningMerge,
+        IBaseDirtyChecker baseDirtyChecker)
     {
         _tasks = tasks;
         _lists = lists;
@@ -158,6 +165,7 @@ public sealed class ExternalMcpService
         _maintenance = maintenance;
         _merge = merge;
         _planningMerge = planningMerge;
+        _baseDirtyChecker = baseDirtyChecker;
     }
 
     [McpServerTool, Description(
@@ -436,6 +444,7 @@ public sealed class ExternalMcpService
         var task = await _tasks.GetByIdAsync(taskId, cancellationToken)
             ?? throw new InvalidOperationException($"Task {taskId} not found.");
 
+        DirtyBaseWarning? baseDirty = null;
         switch (target)
         {
             case TaskStatus.Idle:
@@ -447,6 +456,7 @@ public sealed class ExternalMcpService
                 var enqueueResult = await _state.EnqueueAsync(taskId, cancellationToken);
                 if (!enqueueResult.Ok)
                     throw new InvalidOperationException(enqueueResult.Reason ?? "Cannot enqueue task.");
+                baseDirty = enqueueResult.BaseDirty;
                 break;
 
             case TaskStatus.Cancelled:
@@ -475,7 +485,7 @@ public sealed class ExternalMcpService
         }
 
         var reload = (await _tasks.GetByIdAsync(taskId, cancellationToken))!;
-        return ToRefDto(reload);
+        return ToRefDto(reload) with { BaseDirty = baseDirty };
     }
 
     [McpServerTool, Description(
@@ -652,7 +662,15 @@ public sealed class ExternalMcpService
             throw new InvalidOperationException($"Task {taskId} not found.");
         }
         await _broadcaster.TaskUpdated(taskId);
-        return new RunTaskNowResult(true, taskId);
+
+        // Heads-up only, same as update_task_status's Queued path: a worktree forks from the
+        // commit tip, not the working tree, so uncommitted changes in the list's repo right now
+        // won't be included.
+        var task = await _tasks.GetByIdAsync(taskId, cancellationToken);
+        var list = task is not null ? await _lists.GetByIdAsync(task.ListId, cancellationToken) : null;
+        var baseDirty = await _baseDirtyChecker.CheckAsync(list?.WorkingDir, cancellationToken);
+
+        return new RunTaskNowResult(true, taskId, baseDirty);
     }
 
     [McpServerTool, Description(

src/ClaudeDo.Worker/Git/BaseDirtyChecker.cs

@@ -0,0 +1,88 @@
+using System.Collections.Concurrent;
+using ClaudeDo.Data.Git;
+
+namespace ClaudeDo.Worker.Git;
+
+public sealed record DirtyBaseWarning(int ModifiedCount, int UntrackedCount);
+
+/// <summary>
+/// Detects uncommitted changes in a list's working directory before a task forks a worktree
+/// from HEAD. WorktreeManager.ResolveBaseCommitAsync forks from the commit tip, never the
+/// working tree, so local edits sitting there are silently invisible to every task queued
+/// against that list -- each one starts without them and can collide re-creating the same
+/// files. Non-blocking by design: callers surface the counts as a heads-up, never refuse the
+/// transition.
+/// </summary>
+public interface IBaseDirtyChecker
+{
+    Task<DirtyBaseWarning?> CheckAsync(string? workingDir, CancellationToken ct);
+}
+
+public sealed class BaseDirtyChecker : IBaseDirtyChecker
+{
+    // Long enough to collapse every task in one batch_update_task_status call over the same
+    // list into a single `git status` invocation; short enough that a later, independent queue
+    // action re-checks instead of trusting a stale answer.
+    private static readonly TimeSpan CacheTtl = TimeSpan.FromSeconds(10);
+
+    private readonly GitService _git;
+    private readonly ILogger<BaseDirtyChecker> _logger;
+    private readonly ConcurrentDictionary<string, (DateTime ExpiresAtUtc, DirtyBaseWarning? Warning)> _cache = new();
+
+    public BaseDirtyChecker(GitService git, ILogger<BaseDirtyChecker> logger)
+    {
+        _git = git;
+        _logger = logger;
+    }
+
+    public async Task<DirtyBaseWarning?> CheckAsync(string? workingDir, CancellationToken ct)
+    {
+        if (string.IsNullOrWhiteSpace(workingDir))
+            return null;
+
+        string key;
+        try { key = Path.GetFullPath(workingDir); }
+        catch { return null; }
+
+        if (_cache.TryGetValue(key, out var cached) && cached.ExpiresAtUtc > DateTime.UtcNow)
+            return cached.Warning;
+
+        var warning = await ComputeAsync(key, ct);
+        _cache[key] = (DateTime.UtcNow.Add(CacheTtl), warning);
+        return warning;
+    }
+
+    private async Task<DirtyBaseWarning?> ComputeAsync(string workingDir, CancellationToken ct)
+    {
+        try
+        {
+            if (!await _git.IsGitRepoAsync(workingDir, ct))
+                return null;
+
+            var porcelain = await _git.GetStatusPorcelainAsync(workingDir, ct);
+            return Parse(porcelain);
+        }
+        catch (OperationCanceledException) { throw; }
+        catch (Exception ex)
+        {
+            // Never blocks a queue/run transition on a check that only exists to warn.
+            _logger.LogWarning(ex, "Base-dirty check failed for {WorkingDir}", workingDir);
+            return null;
+        }
+    }
+
+    private static DirtyBaseWarning? Parse(string porcelain)
+    {
+        if (string.IsNullOrWhiteSpace(porcelain)) return null;
+
+        int modified = 0, untracked = 0;
+        foreach (var raw in porcelain.Split('\n', StringSplitOptions.RemoveEmptyEntries))
+        {
+            var line = raw.TrimEnd('\r');
+            if (line.Length == 0) continue;
+            if (line.StartsWith("??", StringComparison.Ordinal)) untracked++;
+            else modified++;
+        }
+        return modified == 0 && untracked == 0 ? null : new DirtyBaseWarning(modified, untracked);
+    }
+}

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -88,6 +88,8 @@ public record ForceRemoveResultDto(bool Removed, string? Reason);
 public record PlanningMergeConflictStateDto(string PlanningTaskId, string SubtaskId);
 public record PendingQuestionDto(string TaskId, string QuestionId, string Question);
 public record MergeResultDto(string Status, IReadOnlyList<string> ConflictFiles, string? ErrorMessage);
+public record BaseDirtyWarningDto(int ModifiedCount, int UntrackedCount);
+public record SetTaskStatusResultDto(BaseDirtyWarningDto? BaseDirty);
 public record MergePreviewDto(string Status, IReadOnlyList<string> ConflictFiles, int ChangedFileCount);
 public record MergeTargetsDto(string DefaultBranch, IReadOnlyList<string> LocalBranches);
 public record MergeConflictDocumentsDto(string TaskId, IReadOnlyList<ConflictDocumentDto> Files);
@@ -706,7 +708,7 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
         return new ListConfigDto(config.Model, config.SystemPrompt, config.AgentPath, config.MaxTurns, SkillsFromJson(config.SessionSkills), config.VerifyCommand);
     }
 
-    public async Task SetTaskStatus(string taskId, string status)
+    public async Task<SetTaskStatusResultDto> SetTaskStatus(string taskId, string status)
     {
         if (!Enum.TryParse<TaskStatus>(status, ignoreCase: true, out var parsed))
             throw new HubException($"unknown status: {status}");
@@ -716,6 +718,8 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
             ? await _state.EnqueueAsync(taskId, Context.ConnectionAborted)
             : await _state.ForceSetStatusAsync(taskId, parsed, Context.ConnectionAborted);
         if (!result.Ok) throw new HubException(result.Reason ?? "set status failed");
+        return new SetTaskStatusResultDto(
+            result.BaseDirty is { } w ? new BaseDirtyWarningDto(w.ModifiedCount, w.UntrackedCount) : null);
     }
 
     public Task<MergeResultDto> ApproveReview(string taskId, string targetBranch)

src/ClaudeDo.Worker/Program.cs

@@ -6,6 +6,7 @@ using ClaudeDo.Worker.Agents;
 using ClaudeDo.Worker.Config;
 using ClaudeDo.Worker.External;
 using ClaudeDo.Worker.Findings;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Logging;
@@ -107,6 +108,7 @@ builder.Services.AddSingleton<Func<ITaskStateService>>(sp => () => sp.GetRequire
 // PlanningMergeOrchestrator itself depends on ITaskStateService, so TaskStateService can only
 // reach it lazily (Func<IActiveMergeState>) — same cycle-breaking shape as the Func above.
 builder.Services.AddSingleton<Func<IActiveMergeState>>(sp => () => sp.GetRequiredService<PlanningMergeOrchestrator>());
+builder.Services.AddSingleton<IBaseDirtyChecker, BaseDirtyChecker>();
 builder.Services.AddSingleton<ITaskStateService>(sp => new TaskStateService(
     sp.GetRequiredService<IDbContextFactory<ClaudeDoDbContext>>(),
     sp.GetRequiredService<HubBroadcaster>(),
@@ -114,6 +116,7 @@ builder.Services.AddSingleton<ITaskStateService>(sp => new TaskStateService(
     sp.GetRequiredService<PlanningChainCoordinator>(),
     sp.GetRequiredService<RunCancellationRegistry>(),
     sp.GetRequiredService<Func<IActiveMergeState>>(),
+    sp.GetRequiredService<IBaseDirtyChecker>(),
     sp.GetRequiredService<ILogger<TaskStateService>>()));
 
 // Agent file management.
@@ -302,6 +305,7 @@ if (cfg.ExternalMcpPort > 0)
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<AgentFileService>());
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<TaskResetService>());
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<GitService>());
+    externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<IBaseDirtyChecker>());
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<WorktreeMaintenanceService>());
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<TaskMergeService>());
     externalBuilder.Services.AddSingleton(app.Services.GetRequiredService<PlanningMergeOrchestrator>());

src/ClaudeDo.Worker/State/TaskStateService.cs

@@ -1,6 +1,7 @@
 using ClaudeDo.Data;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Planning;
 using ClaudeDo.Worker.Queue;
@@ -17,6 +18,7 @@ public sealed class TaskStateService : ITaskStateService
     private readonly PlanningChainCoordinator _chain;
     private readonly RunCancellationRegistry _runCancels;
     private readonly Func<IActiveMergeState> _mergeState;
+    private readonly IBaseDirtyChecker _baseDirtyChecker;
     private readonly ILogger<TaskStateService> _logger;
 
     public TaskStateService(
@@ -26,6 +28,7 @@ public sealed class TaskStateService : ITaskStateService
         PlanningChainCoordinator chain,
         RunCancellationRegistry runCancels,
         Func<IActiveMergeState> mergeState,
+        IBaseDirtyChecker baseDirtyChecker,
         ILogger<TaskStateService> logger)
     {
         _dbFactory = dbFactory;
@@ -34,6 +37,7 @@ public sealed class TaskStateService : ITaskStateService
         _chain = chain;
         _runCancels = runCancels;
         _mergeState = mergeState;
+        _baseDirtyChecker = baseDirtyChecker;
         _logger = logger;
     }
 
@@ -56,7 +60,17 @@ public sealed class TaskStateService : ITaskStateService
 
         _waker.Wake();
         await _broadcaster.TaskUpdated(taskId);
-        return new TransitionResult(true, null);
+
+        // Heads-up only: a worktree forks from the commit tip (WorktreeManager.ResolveBaseCommitAsync),
+        // not the working tree, so uncommitted changes sitting in the list's repo right now are
+        // invisible to this (and every other) queued task. Never blocks the transition above.
+        var workingDir = await ctx.Tasks.AsNoTracking()
+            .Where(t => t.Id == taskId)
+            .Select(t => t.List.WorkingDir)
+            .FirstOrDefaultAsync(ct);
+        var baseDirty = await _baseDirtyChecker.CheckAsync(workingDir, ct);
+
+        return new TransitionResult(true, null, baseDirty);
     }
 
     public async Task<TransitionResult> StartRunningAsync(string taskId, DateTime startedAt, CancellationToken ct)

src/ClaudeDo.Worker/State/TransitionResult.cs

@@ -1,3 +1,5 @@
+using ClaudeDo.Worker.Git;
+
 namespace ClaudeDo.Worker.State;
 
-public sealed record TransitionResult(bool Ok, string? Reason);
+public sealed record TransitionResult(bool Ok, string? Reason, DirtyBaseWarning? BaseDirty = null);