diff --git a/src/ClaudeDo.Data/Configuration/TaskEntityConfiguration.cs b/src/ClaudeDo.Data/Configuration/TaskEntityConfiguration.cs
index 4d1cf410..cc48831a 100644
--- a/src/ClaudeDo.Data/Configuration/TaskEntityConfiguration.cs
+++ b/src/ClaudeDo.Data/Configuration/TaskEntityConfiguration.cs
@@ -97,6 +97,7 @@ public class TaskEntityConfiguration : IEntityTypeConfiguration<TaskEntity>
         builder.Property(t => t.IsStarred).HasColumnName("is_starred").HasDefaultValue(false);
         builder.Property(t => t.IsMyDay).HasColumnName("is_my_day").HasDefaultValue(false);
         builder.Property(t => t.IsManual).HasColumnName("is_manual").HasDefaultValue(false);
+        builder.Property(t => t.ExpectsNoDiff).HasColumnName("expects_no_diff").HasDefaultValue(false);
         builder.Property(t => t.Notes).HasColumnName("notes");
         builder.Property(t => t.SortOrder).HasColumnName("sort_order").IsRequired().HasDefaultValue(0);
         builder.Property(t => t.SessionSkills).HasColumnName("session_skills");
diff --git a/src/ClaudeDo.Data/Migrations/20260902102003_AddExpectsNoDiff.Designer.cs b/src/ClaudeDo.Data/Migrations/20260902102003_AddExpectsNoDiff.Designer.cs
new file mode 100644
index 00000000..a754e844
--- /dev/null
+++ b/src/ClaudeDo.Data/Migrations/20260902102003_AddExpectsNoDiff.Designer.cs
@@ -0,0 +1,988 @@
+// <auto-generated />
+using System;
+using ClaudeDo.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    [DbContext(typeof(ClaudeDoDbContext))]
+    [Migration("20260902102003_AddExpectsNoDiff")]
+    partial class AddExpectsNoDiff
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "8.0.11");
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.AppSettingsEntity", b =>
+                {
+                    b.Property<int>("Id")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("id");
+
+                    b.Property<bool>("AutoContinueOnUsageLimit")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("auto_continue_on_usage_limit");
+
+                    b.Property<string>("CentralWorktreeRoot")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("central_worktree_root");
+
+                    b.Property<int>("DailyPrepMaxTasks")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(5)
+                        .HasColumnName("daily_prep_max_tasks");
+
+                    b.Property<string>("DefaultClaudeInstructions")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("")
+                        .HasColumnName("default_claude_instructions");
+
+                    b.Property<int>("DefaultMaxTurns")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(40)
+                        .HasColumnName("default_max_turns");
+
+                    b.Property<string>("DefaultModel")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("sonnet")
+                        .HasColumnName("default_model");
+
+                    b.Property<string>("DefaultPermissionMode")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("bypassPermissions")
+                        .HasColumnName("default_permission_mode");
+
+                    b.Property<int>("MaxParallelExecutions")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(1)
+                        .HasColumnName("max_parallel_executions");
+
+                    b.Property<int>("MaxTurnsCeiling")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(80)
+                        .HasColumnName("max_turns_ceiling");
+
+                    b.Property<string>("ModelPresets")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("model_presets");
+
+                    b.Property<int>("NextTaskNumber")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(1)
+                        .HasColumnName("next_task_number");
+
+                    b.Property<string>("RepoImportFolders")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("repo_import_folders");
+
+                    b.Property<string>("ReportExcludedPaths")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("report_excluded_paths");
+
+                    b.Property<string>("SessionSkills")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("session_skills");
+
+                    b.Property<int>("StandupWeekday")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(3)
+                        .HasColumnName("standup_weekday");
+
+                    b.Property<int>("UsageGateFiveHourPct")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(80)
+                        .HasColumnName("usage_gate_five_hour_pct");
+
+                    b.Property<int>("UsageGateSevenDayPct")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(90)
+                        .HasColumnName("usage_gate_seven_day_pct");
+
+                    b.Property<int>("UsageThrottleFiveHourHardPct")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(65)
+                        .HasColumnName("usage_throttle_five_hour_hard_pct");
+
+                    b.Property<int>("UsageThrottleFiveHourSoftPct")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(50)
+                        .HasColumnName("usage_throttle_five_hour_soft_pct");
+
+                    b.Property<int>("UsageThrottleSevenDayHardPct")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(65)
+                        .HasColumnName("usage_throttle_seven_day_hard_pct");
+
+                    b.Property<int>("UsageThrottleSevenDaySoftPct")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(50)
+                        .HasColumnName("usage_throttle_seven_day_soft_pct");
+
+                    b.Property<int>("WorktreeAutoCleanupDays")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(7)
+                        .HasColumnName("worktree_auto_cleanup_days");
+
+                    b.Property<bool>("WorktreeAutoCleanupEnabled")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("worktree_auto_cleanup_enabled");
+
+                    b.Property<string>("WorktreeStrategy")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("sibling")
+                        .HasColumnName("worktree_strategy");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("app_settings", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            Id = 1,
+                            AutoContinueOnUsageLimit = false,
+                            DailyPrepMaxTasks = 5,
+                            DefaultClaudeInstructions = "",
+                            DefaultMaxTurns = 40,
+                            DefaultModel = "sonnet",
+                            DefaultPermissionMode = "auto",
+                            MaxParallelExecutions = 1,
+                            MaxTurnsCeiling = 80,
+                            NextTaskNumber = 1,
+                            StandupWeekday = 3,
+                            UsageGateFiveHourPct = 80,
+                            UsageGateSevenDayPct = 90,
+                            UsageThrottleFiveHourHardPct = 65,
+                            UsageThrottleFiveHourSoftPct = 50,
+                            UsageThrottleSevenDayHardPct = 65,
+                            UsageThrottleSevenDaySoftPct = 50,
+                            WorktreeAutoCleanupDays = 7,
+                            WorktreeAutoCleanupEnabled = false,
+                            WorktreeStrategy = "sibling"
+                        });
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.DailyNoteEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<DateOnly>("Date")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("note_date");
+
+                    b.Property<bool>("FromAgent")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("from_agent");
+
+                    b.Property<int>("SortOrder")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("sort_order");
+
+                    b.Property<string>("Text")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Date");
+
+                    b.ToTable("daily_notes", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.ListConfigEntity", b =>
+                {
+                    b.Property<string>("ListId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("list_id");
+
+                    b.Property<string>("AgentPath")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("agent_path");
+
+                    b.Property<int?>("MaxTurns")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("max_turns");
+
+                    b.Property<string>("Model")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("model");
+
+                    b.Property<string>("PermissionMode")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("permission_mode");
+
+                    b.Property<string>("SessionSkills")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("session_skills");
+
+                    b.Property<string>("SystemPrompt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("system_prompt");
+
+                    b.Property<int?>("TicketProjectId")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("ticket_project_id");
+
+                    b.Property<string>("VerifyCommand")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("verify_command");
+
+                    b.HasKey("ListId");
+
+                    b.ToTable("list_config", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.ListEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<string>("DefaultCommitType")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("chore")
+                        .HasColumnName("default_commit_type");
+
+                    b.Property<bool>("FindingsTracked")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("findings_tracked");
+
+                    b.Property<string>("Icon")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("icon");
+
+                    b.Property<bool>("IsManual")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_manual");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("name");
+
+                    b.Property<int>("SortOrder")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(0)
+                        .HasColumnName("sort_order");
+
+                    b.Property<string>("WorkingDir")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("working_dir");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("SortOrder")
+                        .HasDatabaseName("idx_lists_sort");
+
+                    b.ToTable("lists", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.PrimeScheduleEntity", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<DateTimeOffset>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<int>("Days")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(31)
+                        .HasColumnName("days_of_week");
+
+                    b.Property<bool>("Enabled")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(true)
+                        .HasColumnName("enabled");
+
+                    b.Property<string>("Kind")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("ping")
+                        .HasColumnName("action_kind");
+
+                    b.Property<DateTimeOffset?>("LastRunAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("last_run_at");
+
+                    b.Property<string>("PromptOverride")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("prompt_override");
+
+                    b.Property<TimeSpan>("TimeOfDay")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("time_of_day");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("prime_schedules", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.SessionSkillEntity", b =>
+                {
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("name");
+
+                    b.Property<DateTimeOffset>("AddedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("added_at");
+
+                    b.Property<string>("Description")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("description");
+
+                    b.Property<string>("PinnedRef")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("pinned_ref");
+
+                    b.Property<string>("SourceUrl")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("source_url");
+
+                    b.Property<string>("Subpath")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("subpath");
+
+                    b.HasKey("Name");
+
+                    b.ToTable("session_skills", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.SubtaskEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<bool>("Completed")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("completed");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<int>("OrderNum")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("order_num");
+
+                    b.Property<string>("TaskId")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("task_id");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("title");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TaskId")
+                        .HasDatabaseName("idx_subtasks_task_id");
+
+                    b.ToTable("subtasks", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskAttachmentEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<long>("ByteSize")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("byte_size");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<string>("FileName")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("file_name");
+
+                    b.Property<string>("TaskId")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("task_id");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TaskId")
+                        .HasDatabaseName("idx_task_attachments_task_id");
+
+                    b.ToTable("task_attachments", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<string>("AgentPath")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("agent_path");
+
+                    b.Property<string>("BlockedByTaskId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("blocked_by_task_id");
+
+                    b.Property<string>("CommitType")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("chore")
+                        .HasColumnName("commit_type");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<string>("CreatedBy")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_by");
+
+                    b.Property<string>("DependsOnTaskId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("depends_on_task_id");
+
+                    b.Property<string>("Description")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("description");
+
+                    b.Property<bool>("ExpectsNoDiff")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("expects_no_diff");
+
+                    b.Property<int?>("FailureMaxTurns")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("failure_max_turns");
+
+                    b.Property<string>("FailureReason")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("failure_reason");
+
+                    b.Property<int?>("FailureTurnsUsed")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("failure_turns_used");
+
+                    b.Property<DateTime?>("FinishedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("finished_at");
+
+                    b.Property<string>("HandlerBaseCommit")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("handler_base_commit");
+
+                    b.Property<string>("HandlerHeadCommit")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("handler_head_commit");
+
+                    b.Property<string>("InteractiveSessionId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("interactive_session_id");
+
+                    b.Property<bool>("IsManual")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_manual");
+
+                    b.Property<bool>("IsMyDay")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_my_day");
+
+                    b.Property<bool>("IsStarred")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_starred");
+
+                    b.Property<string>("ListId")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("list_id");
+
+                    b.Property<string>("LogPath")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("log_path");
+
+                    b.Property<int?>("MaxTurns")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("max_turns");
+
+                    b.Property<string>("Model")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("model");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("notes");
+
+                    b.Property<int>("Number")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("number");
+
+                    b.Property<string>("ParentTaskId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("parent_task_id");
+
+                    b.Property<string>("PermissionMode")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("permission_mode");
+
+                    b.Property<DateTime?>("PlanningFinalizedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("planning_finalized_at");
+
+                    b.Property<string>("PlanningPhase")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("none")
+                        .HasColumnName("planning_phase");
+
+                    b.Property<string>("PlanningSessionId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("planning_session_id");
+
+                    b.Property<string>("PlanningSessionToken")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("planning_session_token");
+
+                    b.Property<string>("Result")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("result");
+
+                    b.Property<string>("ReviewFeedback")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("review_feedback");
+
+                    b.Property<int>("RoadblockCount")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(0)
+                        .HasColumnName("roadblock_count");
+
+                    b.Property<DateTime?>("ScheduledFor")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("scheduled_for");
+
+                    b.Property<string>("SessionSkills")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("session_skills");
+
+                    b.Property<int>("SortOrder")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(0)
+                        .HasColumnName("sort_order");
+
+                    b.Property<DateTime?>("StartedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("started_at");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("status");
+
+                    b.Property<string>("SystemPrompt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("system_prompt");
+
+                    b.Property<string>("TicketRef")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("ticket_ref");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("title");
+
+                    b.Property<DateTime?>("UsageLimitAutoContinuedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("usage_limit_auto_continued_at");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BlockedByTaskId")
+                        .HasDatabaseName("idx_tasks_blocked_by");
+
+                    b.HasIndex("DependsOnTaskId")
+                        .HasDatabaseName("idx_tasks_depends_on");
+
+                    b.HasIndex("ListId")
+                        .HasDatabaseName("idx_tasks_list_id");
+
+                    b.HasIndex("Number")
+                        .IsUnique()
+                        .HasDatabaseName("idx_tasks_number");
+
+                    b.HasIndex("ParentTaskId")
+                        .HasDatabaseName("idx_tasks_parent_task_id");
+
+                    b.HasIndex("Status")
+                        .HasDatabaseName("idx_tasks_status");
+
+                    b.HasIndex("ListId", "SortOrder")
+                        .HasDatabaseName("idx_tasks_list_sort");
+
+                    b.ToTable("tasks", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskRunEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<int?>("CacheReadTokens")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("cache_read_tokens");
+
+                    b.Property<int?>("CacheWriteTokens")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("cache_write_tokens");
+
+                    b.Property<string>("ErrorMarkdown")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("error_markdown");
+
+                    b.Property<string>("Errors")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("errors");
+
+                    b.Property<int?>("ExitCode")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("exit_code");
+
+                    b.Property<DateTime?>("FinishedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("finished_at");
+
+                    b.Property<bool>("IsRetry")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_retry");
+
+                    b.Property<string>("LogPath")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("log_path");
+
+                    b.Property<string>("Model")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("model");
+
+                    b.Property<string>("Prompt")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("prompt");
+
+                    b.Property<string>("ResultMarkdown")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("result_markdown");
+
+                    b.Property<string>("ResultSubtype")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("result_subtype");
+
+                    b.Property<int>("RunNumber")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("run_number");
+
+                    b.Property<string>("SessionId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("session_id");
+
+                    b.Property<DateTime?>("StartedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("started_at");
+
+                    b.Property<string>("StructuredOutputJson")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("structured_output");
+
+                    b.Property<string>("TaskId")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("task_id");
+
+                    b.Property<string>("TerminalReason")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("terminal_reason");
+
+                    b.Property<int?>("TokensIn")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("tokens_in");
+
+                    b.Property<int?>("TokensOut")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("tokens_out");
+
+                    b.Property<int?>("TurnCount")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("turn_count");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TaskId")
+                        .HasDatabaseName("idx_task_runs_task_id");
+
+                    b.ToTable("task_runs", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.WeekReportEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("id");
+
+                    b.Property<DateOnly>("EndDate")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("end_date");
+
+                    b.Property<DateTime>("GeneratedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("generated_at");
+
+                    b.Property<string>("Markdown")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("markdown");
+
+                    b.Property<DateOnly>("StartDate")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("start_date");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("StartDate", "EndDate")
+                        .IsUnique();
+
+                    b.ToTable("week_reports", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.WorktreeEntity", b =>
+                {
+                    b.Property<string>("TaskId")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("task_id");
+
+                    b.Property<string>("BaseCommit")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("base_commit");
+
+                    b.Property<string>("BranchName")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("branch_name");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("created_at");
+
+                    b.Property<string>("DiffStat")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("diff_stat");
+
+                    b.Property<string>("HeadCommit")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("head_commit");
+
+                    b.Property<string>("MergeCommit")
+                        .HasColumnType("TEXT")
+                        .HasColumnName("merge_commit");
+
+                    b.Property<string>("Path")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasColumnName("path");
+
+                    b.Property<string>("State")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("TEXT")
+                        .HasDefaultValue("active")
+                        .HasColumnName("state");
+
+                    b.HasKey("TaskId");
+
+                    b.ToTable("worktrees", (string)null);
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.ListConfigEntity", b =>
+                {
+                    b.HasOne("ClaudeDo.Data.Models.ListEntity", "List")
+                        .WithOne("Config")
+                        .HasForeignKey("ClaudeDo.Data.Models.ListConfigEntity", "ListId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("List");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.SubtaskEntity", b =>
+                {
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", "Task")
+                        .WithMany("Subtasks")
+                        .HasForeignKey("TaskId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Task");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskAttachmentEntity", b =>
+                {
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", "Task")
+                        .WithMany()
+                        .HasForeignKey("TaskId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Task");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskEntity", b =>
+                {
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", null)
+                        .WithMany()
+                        .HasForeignKey("BlockedByTaskId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", null)
+                        .WithMany()
+                        .HasForeignKey("DependsOnTaskId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("ClaudeDo.Data.Models.ListEntity", "List")
+                        .WithMany("Tasks")
+                        .HasForeignKey("ListId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", "Parent")
+                        .WithMany("Children")
+                        .HasForeignKey("ParentTaskId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("List");
+
+                    b.Navigation("Parent");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskRunEntity", b =>
+                {
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", "Task")
+                        .WithMany("Runs")
+                        .HasForeignKey("TaskId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Task");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.WorktreeEntity", b =>
+                {
+                    b.HasOne("ClaudeDo.Data.Models.TaskEntity", "Task")
+                        .WithOne("Worktree")
+                        .HasForeignKey("ClaudeDo.Data.Models.WorktreeEntity", "TaskId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Task");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.ListEntity", b =>
+                {
+                    b.Navigation("Config");
+
+                    b.Navigation("Tasks");
+                });
+
+            modelBuilder.Entity("ClaudeDo.Data.Models.TaskEntity", b =>
+                {
+                    b.Navigation("Children");
+
+                    b.Navigation("Runs");
+
+                    b.Navigation("Subtasks");
+
+                    b.Navigation("Worktree");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/src/ClaudeDo.Data/Migrations/20260902102003_AddExpectsNoDiff.cs b/src/ClaudeDo.Data/Migrations/20260902102003_AddExpectsNoDiff.cs
new file mode 100644
index 00000000..5f3aec0f
--- /dev/null
+++ b/src/ClaudeDo.Data/Migrations/20260902102003_AddExpectsNoDiff.cs
@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddExpectsNoDiff : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<bool>(
+                name: "expects_no_diff",
+                table: "tasks",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: false);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "expects_no_diff",
+                table: "tasks");
+        }
+    }
+}
diff --git a/src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs b/src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs
index 12c24ebe..0f2ef993 100644
--- a/src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs
+++ b/src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs
@@ -512,6 +512,12 @@ namespace ClaudeDo.Data.Migrations
                         .HasColumnType("TEXT")
                         .HasColumnName("description");
 
+                    b.Property<bool>("ExpectsNoDiff")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(false)
+                        .HasColumnName("expects_no_diff");
+
                     b.Property<int?>("FailureMaxTurns")
                         .HasColumnType("INTEGER")
                         .HasColumnName("failure_max_turns");
diff --git a/src/ClaudeDo.Data/Models/TaskEntity.cs b/src/ClaudeDo.Data/Models/TaskEntity.cs
index 22ee442d..e7a852f0 100644
--- a/src/ClaudeDo.Data/Models/TaskEntity.cs
+++ b/src/ClaudeDo.Data/Models/TaskEntity.cs
@@ -71,6 +71,10 @@ public sealed class TaskEntity
     // list handler) and the Claude affordances are hidden; a hand-driven ConPTY session is still
     // allowed. New tasks in a manual list default to true.
     public bool IsManual { get; set; }
+    // Set on verification/audit/research tasks whose correct outcome is an empty diff (e.g. "build
+    // and test, don't change code"). Lets the merge-helper session tell that apart from a task that
+    // silently failed to commit -- both look identical to preview_merge_set otherwise.
+    public bool ExpectsNoDiff { get; set; }
     public string? Notes { get; set; }
     public int SortOrder { get; set; }
     public string? SessionSkills { get; set; }
diff --git a/src/ClaudeDo.Data/PromptFiles.cs b/src/ClaudeDo.Data/PromptFiles.cs
index 2386be43..b3ef6190 100644
--- a/src/ClaudeDo.Data/PromptFiles.cs
+++ b/src/ClaudeDo.Data/PromptFiles.cs
@@ -515,7 +515,7 @@ public static class PromptFiles
         One task at a time. Default to the order the brief lists them. If the overlap check shows two or more tasks touching the same file, tell the user which tasks collide and merge those in an order you can justify (e.g. the one making the smaller change first) — deviate from brief order only with that stated reason.
 
         1. Check this task's changedFileCount from preview_merge_set first. Below 5 changed files, read get_task_diff yourself and sanity-check it against the task's title and description — a subagent hop is wasted context for a diff that small. At 5 or more, delegate instead: start a sonnet subagent (Task tool) to inspect get_task_diff and sanity-check it, so only its short verdict (clean / risky + reason) comes back into your own context — the whole point of never reading a large diff yourself. If preview_merge_set flagged this task in an overlap, also skim (or have the subagent skim) the diff of the other task(s) sharing that file.
-        2. Before approving, cross-check changedFileCount from preview_merge_set (or the length of get_task_diff's files list — the diff tool has no changedFileCount field). 0 changed files means an empty branch, not a clean success — do not approve it; treat it like a risky diff instead.
+        2. Before approving, cross-check changedFileCount from preview_merge_set (or the length of get_task_diff's files list — the diff tool has no changedFileCount field). 0 changed files means an empty branch, not a clean success — do not approve it; treat it like a risky diff instead. Exception: if preview_merge_set's expectsNoDiff is true for this task (a verification/audit/research task deliberately expected to change nothing), 0 changed files is the correct outcome — read the task's Result to confirm it reports what was checked and that it passed, then approve normally.
         3. If the subagent's verdict is risky, or the change looks wrong or incomplete, STOP and ask the user before merging — offer reject_rerun (with feedback) or skip.
         4. Otherwise merge with review_task(taskId, decision="approve", leaveConflictsInTree=true, skipVerify=true). skipVerify defers the list's verify command to ONE verify_merges call after the last merge (below) instead of paying it per merge.
            - Clean merge → mergeStatus "merged_verify_pending" (expected: the task deliberately stays WaitingForReview until verify_merges passes) or "merged" (list has no verify command; the task is Done). Either way, move on.
diff --git a/src/ClaudeDo.Worker/External/ExternalMcpService.cs b/src/ClaudeDo.Worker/External/ExternalMcpService.cs
index 5b09fdc6..8eb825b4 100644
--- a/src/ClaudeDo.Worker/External/ExternalMcpService.cs
+++ b/src/ClaudeDo.Worker/External/ExternalMcpService.cs
@@ -62,7 +62,8 @@ public sealed record TaskDto(
     // planning-chain predecessor or DependsOnTaskId hasn't reached Done. See BlockedReason.
     bool Blocked = false,
     string? BlockedReason = null,
-    bool IsManual = false);
+    bool IsManual = false,
+    bool ExpectsNoDiff = false);
 
 // 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.
@@ -85,7 +86,8 @@ public sealed record TaskRefDto(
     bool Blocked = false,
     string? BlockedReason = null,
     DirtyBaseWarning? BaseDirty = null,
-    bool IsManual = false);
+    bool IsManual = false,
+    bool ExpectsNoDiff = false);
 
 // tasks is populated when includeDescription=false (the default): lean references, no
 // Description/Result. tasksFull is populated when includeDescription=true: full tasks incl.
@@ -300,6 +302,10 @@ public sealed class ExternalMcpService
                      "dependency cycle. If that predecessor instead ends up Failed or Cancelled, this task simply " +
                      "stays blocked rather than starving silently -- check get_task/list_tasks' blocked field.")]
         string? dependsOnTaskId = null,
+        [Description("true: this task's correct outcome may be an empty diff (verification/audit/research work " +
+                     "that doesn't change code) — the merge helper won't treat a 0-changed-files result as a red " +
+                     "flag. false (default): an empty diff is treated as suspicious, not a clean success.")]
+        bool expectsNoDiff = false,
         CancellationToken cancellationToken = default)
     {
         if (string.IsNullOrWhiteSpace(listId))
@@ -327,6 +333,7 @@ public sealed class ExternalMcpService
             Model = ModelRegistry.NormalizeAlias(model),
             // A manual list holds reminders, so anything filed there starts out manual.
             IsManual = list.IsManual,
+            ExpectsNoDiff = expectsNoDiff,
         };
         await _tasks.AddAsync(entity, cancellationToken);
 
@@ -422,8 +429,8 @@ public sealed class ExternalMcpService
     }
 
     [McpServerTool, Description(
-        "Update an existing task's title, description, commit type, dependsOn link, and/or manual flag. Pass " +
-        "null to leave a field unchanged." + McpToolDocs.NotWhileRunning + McpToolDocs.LeanTaskRef)]
+        "Update an existing task's title, description, commit type, dependsOn link, and/or manual/expects-no-diff " +
+        "flags. Pass null to leave a field unchanged." + McpToolDocs.NotWhileRunning + McpToolDocs.LeanTaskRef)]
     public async Task<TaskRefDto> UpdateTask(
         string taskId,
         string? title = null,
@@ -437,6 +444,10 @@ public sealed class ExternalMcpService
                      "daily prep, and the list handler all skip it (a ConPTY session may still touch it). false: " +
                      "clear the flag. null (default): leave unchanged.")]
         bool? isManual = null,
+        [Description("true: this task's correct outcome may be an empty diff (verification/audit/research work " +
+                     "that doesn't change code) — the merge helper won't treat a 0-changed-files result as a red " +
+                     "flag. false: clear the flag. null (default): leave unchanged.")]
+        bool? expectsNoDiff = null,
         CancellationToken cancellationToken = default)
     {
         taskId = await TaskIdResolver.ResolveAsync(_tasks, taskId, cancellationToken);
@@ -449,6 +460,7 @@ public sealed class ExternalMcpService
         if (description is not null) task.Description = description;
         if (commitType is not null) task.CommitType = commitType;
         if (isManual is not null) task.IsManual = isManual.Value;
+        if (expectsNoDiff is not null) task.ExpectsNoDiff = expectsNoDiff.Value;
         await _tasks.UpdateAsync(task, cancellationToken);
 
         if (dependsOnTaskId is not null)
@@ -986,7 +998,8 @@ public sealed class ExternalMcpService
         t.DependsOnTaskId,
         blocked,
         blockedReason,
-        t.IsManual);
+        t.IsManual,
+        t.ExpectsNoDiff);
 
     // internal: AbortMerge in MergeMcpTools also needs this to build its TaskRefDto result.
     internal static TaskRefDto ToRefDto(TaskEntity t, bool blocked = false, string? blockedReason = null) => new(
@@ -1005,7 +1018,8 @@ public sealed class ExternalMcpService
         blocked,
         blockedReason,
         BaseDirty: null,
-        IsManual: t.IsManual);
+        IsManual: t.IsManual,
+        ExpectsNoDiff: t.ExpectsNoDiff);
 
     // "unknown" covers a Failed task that predates this field (never got a classified reason
     // stamped) — a defined value rather than null so callers don't have to special-case it.
diff --git a/tests/ClaudeDo.Data.Tests/ExpectsNoDiffTests.cs b/tests/ClaudeDo.Data.Tests/ExpectsNoDiffTests.cs
new file mode 100644
index 00000000..a9ba8171
--- /dev/null
+++ b/tests/ClaudeDo.Data.Tests/ExpectsNoDiffTests.cs
@@ -0,0 +1,58 @@
+using ClaudeDo.Data;
+using ClaudeDo.Data.Models;
+using Microsoft.EntityFrameworkCore;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+
+namespace ClaudeDo.Data.Tests;
+
+public sealed class ExpectsNoDiffTests : IDisposable
+{
+    private readonly string _dbPath;
+    private readonly ClaudeDoDbContext _ctx;
+
+    private const string ListId = "l1";
+
+    public ExpectsNoDiffTests()
+    {
+        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_endiff_{Guid.NewGuid():N}.db");
+        var options = new DbContextOptionsBuilder<ClaudeDoDbContext>()
+            .UseSqlite($"Data Source={_dbPath}")
+            .Options;
+        _ctx = new ClaudeDoDbContext(options);
+        _ctx.Database.EnsureCreated();
+
+        _ctx.Lists.Add(new ListEntity { Id = ListId, Name = "Test", CreatedAt = DateTime.UtcNow });
+        _ctx.SaveChanges();
+    }
+
+    public void Dispose()
+    {
+        _ctx.Dispose();
+        foreach (var suffix in new[] { "", "-wal", "-shm" })
+            try { File.Delete(_dbPath + suffix); } catch { }
+    }
+
+    [Fact]
+    public void DefaultsToFalse_WhenNotSet()
+    {
+        var task = new TaskEntity { Id = "t1", ListId = ListId, Title = "T", Status = TaskStatus.Idle, CreatedAt = DateTime.UtcNow };
+        _ctx.Tasks.Add(task);
+        _ctx.SaveChanges();
+
+        using var reload = new ClaudeDoDbContext(new DbContextOptionsBuilder<ClaudeDoDbContext>().UseSqlite(_ctx.Database.GetConnectionString()).Options);
+        var reloaded = reload.Tasks.Single(t => t.Id == "t1");
+        Assert.False(reloaded.ExpectsNoDiff);
+    }
+
+    [Fact]
+    public void PersistsTrue_Roundtrip()
+    {
+        var task = new TaskEntity { Id = "t2", ListId = ListId, Title = "T", Status = TaskStatus.Idle, CreatedAt = DateTime.UtcNow, ExpectsNoDiff = true };
+        _ctx.Tasks.Add(task);
+        _ctx.SaveChanges();
+
+        using var reload = new ClaudeDoDbContext(new DbContextOptionsBuilder<ClaudeDoDbContext>().UseSqlite(_ctx.Database.GetConnectionString()).Options);
+        var reloaded = reload.Tasks.Single(t => t.Id == "t2");
+        Assert.True(reloaded.ExpectsNoDiff);
+    }
+}
diff --git a/tests/ClaudeDo.Worker.Tests/External/ExternalMcpServiceTests.cs b/tests/ClaudeDo.Worker.Tests/External/ExternalMcpServiceTests.cs
index 481bd52e..45017ed0 100644
--- a/tests/ClaudeDo.Worker.Tests/External/ExternalMcpServiceTests.cs
+++ b/tests/ClaudeDo.Worker.Tests/External/ExternalMcpServiceTests.cs
@@ -199,7 +199,7 @@ public sealed class ExternalMcpServiceTests : IDisposable
         var queue = CreateQueue();
         var sut = BuildSut(queue);
 
-        var dto = await sut.UpdateTask(task.Id, "new title", null, null, null, null, CancellationToken.None);
+        var dto = await sut.UpdateTask(task.Id, "new title", null, null, null, null, cancellationToken: CancellationToken.None);
 
         Assert.Equal("new title", dto.Title);
         var loaded = await _tasks.GetByIdAsync(task.Id);
@@ -220,7 +220,7 @@ public sealed class ExternalMcpServiceTests : IDisposable
         await _tasks.UpdateAsync(task, CancellationToken.None);
         var sut = BuildSut(CreateQueue());
 
-        var dto = await sut.UpdateTask(task.Id, "new title", null, null, null, null, CancellationToken.None);
+        var dto = await sut.UpdateTask(task.Id, "new title", null, null, null, null, cancellationToken: CancellationToken.None);
 
         Assert.Equal(task.Id, dto.Id);
         Assert.Equal(listId, dto.ListId);
@@ -271,6 +271,50 @@ public sealed class ExternalMcpServiceTests : IDisposable
         Assert.True(dto.IsManual);
     }
 
+    [Fact]
+    public async Task UpdateTask_SetsExpectsNoDiffTrue()
+    {
+        var listId = await SeedListAsync();
+        var task = await SeedTaskAsync(listId);
+        var sut = BuildSut(CreateQueue());
+
+        var dto = await sut.UpdateTask(task.Id, expectsNoDiff: true, cancellationToken: CancellationToken.None);
+
+        Assert.True(dto.ExpectsNoDiff);
+        var loaded = await _tasks.GetByIdAsync(task.Id);
+        Assert.True(loaded!.ExpectsNoDiff);
+    }
+
+    [Fact]
+    public async Task UpdateTask_SetsExpectsNoDiffFalse_ClearsExistingFlag()
+    {
+        var listId = await SeedListAsync();
+        var task = await SeedTaskAsync(listId);
+        task.ExpectsNoDiff = true;
+        await _tasks.UpdateAsync(task, CancellationToken.None);
+        var sut = BuildSut(CreateQueue());
+
+        var dto = await sut.UpdateTask(task.Id, expectsNoDiff: false, cancellationToken: CancellationToken.None);
+
+        Assert.False(dto.ExpectsNoDiff);
+        var loaded = await _tasks.GetByIdAsync(task.Id);
+        Assert.False(loaded!.ExpectsNoDiff);
+    }
+
+    [Fact]
+    public async Task UpdateTask_ExpectsNoDiffNull_LeavesUnchanged()
+    {
+        var listId = await SeedListAsync();
+        var task = await SeedTaskAsync(listId);
+        task.ExpectsNoDiff = true;
+        await _tasks.UpdateAsync(task, CancellationToken.None);
+        var sut = BuildSut(CreateQueue());
+
+        var dto = await sut.UpdateTask(task.Id, title: "new title", cancellationToken: CancellationToken.None);
+
+        Assert.True(dto.ExpectsNoDiff);
+    }
+
     [Fact]
     public async Task GetTask_ReturnsTaskNumber()
     {
@@ -488,7 +532,7 @@ public sealed class ExternalMcpServiceTests : IDisposable
         var sut = BuildSut(queue);
 
         await Assert.ThrowsAsync<InvalidOperationException>(() =>
-            sut.UpdateTask(task.Id, "x", null, null, null, null, CancellationToken.None));
+            sut.UpdateTask(task.Id, "x", null, null, null, null, cancellationToken: CancellationToken.None));
     }
 
     [Fact]
@@ -498,7 +542,7 @@ public sealed class ExternalMcpServiceTests : IDisposable
         var sut = BuildSut(queue);
 
         await Assert.ThrowsAsync<InvalidOperationException>(() =>
-            sut.UpdateTask("does-not-exist", "x", null, null, null, null, CancellationToken.None));
+            sut.UpdateTask("does-not-exist", "x", null, null, null, null, cancellationToken: CancellationToken.None));
     }
 
     [Fact]
@@ -1372,6 +1416,32 @@ public sealed class ExternalMcpServiceTests : IDisposable
         Assert.Equal(loaded!.Number, dto.Task.Number);
     }
 
+    [Fact]
+    public async Task AddTask_DefaultExpectsNoDiff_IsFalse()
+    {
+        var listId = await SeedListAsync();
+        var sut = NewService();
+
+        var dto = await sut.AddTask(listId, "t", cancellationToken: CancellationToken.None);
+
+        Assert.False(dto.Task.ExpectsNoDiff);
+        var loaded = await _tasks.GetByIdAsync(dto.Task.Id);
+        Assert.False(loaded!.ExpectsNoDiff);
+    }
+
+    [Fact]
+    public async Task AddTask_ExpectsNoDiffTrue_PersistsFlag()
+    {
+        var listId = await SeedListAsync();
+        var sut = NewService();
+
+        var dto = await sut.AddTask(listId, "t", expectsNoDiff: true, cancellationToken: CancellationToken.None);
+
+        Assert.True(dto.Task.ExpectsNoDiff);
+        var loaded = await _tasks.GetByIdAsync(dto.Task.Id);
+        Assert.True(loaded!.ExpectsNoDiff);
+    }
+
     // ── AddTask model override ────────────────────────────────────────────────
 
     [Fact]