feat(mcp/external): AddTask accepts tags on creation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Worker/External/ExternalMcpService.cs

@@ -87,13 +87,14 @@ public sealed class ExternalMcpService
         return ToDto(task);
     }
 
-    [McpServerTool, Description("Create a new task in the given list. Set queueImmediately=true to enqueue it for agent execution.")]
+    [McpServerTool, Description("Create a new task in the given list. Set queueImmediately=true to enqueue it for agent execution. Optional tags are attached on creation; missing tag names auto-create.")]
     public async Task<TaskDto> AddTask(
         string listId,
         string title,
         string? description,
         string createdBy,
         bool queueImmediately,
+        IReadOnlyList<string>? tags,
         CancellationToken cancellationToken)
     {
         if (string.IsNullOrWhiteSpace(listId))
@@ -119,6 +120,9 @@ public sealed class ExternalMcpService
         };
         await _tasks.AddAsync(entity, cancellationToken);
 
+        if (tags is not null && tags.Count > 0)
+            await _tasks.SetTagsAsync(entity.Id, tags, cancellationToken);
+
         if (queueImmediately)
             _queue.WakeQueue();
 

tests/ClaudeDo.Worker.Tests/External/ExternalMcpServiceTests.cs

@@ -140,4 +140,36 @@ public sealed class ExternalMcpServiceTests : IDisposable
         Assert.Contains(tags, t => t.Name == "agent");
         Assert.Contains(tags, t => t.Name == "custom-tag");
     }
+
+    [Fact]
+    public async Task AddTask_WithTags_AttachesTags()
+    {
+        var listId = await SeedListAsync();
+        var queue = CreateQueue();
+        var sut = BuildSut(queue);
+
+        var dto = await sut.AddTask(
+            listId, "scope-creep handoff", "desc", "claude-cli",
+            queueImmediately: false,
+            tags: new[] { "agent", "custom" },
+            CancellationToken.None);
+
+        var tags = await _tasks.GetTagsAsync(dto.Id);
+        Assert.Contains(tags, t => t.Name == "agent");
+        Assert.Contains(tags, t => t.Name == "custom");
+    }
+
+    [Fact]
+    public async Task AddTask_NullTags_BehavesAsBefore()
+    {
+        var listId = await SeedListAsync();
+        var queue = CreateQueue();
+        var sut = BuildSut(queue);
+
+        var dto = await sut.AddTask(
+            listId, "no tags", null, "claude-cli",
+            queueImmediately: false, tags: null, CancellationToken.None);
+
+        Assert.Empty(await _tasks.GetTagsAsync(dto.Id));
+    }
 }