feat(daily-prep): add get_daily_prep_candidates MCP tool

src/ClaudeDo.Worker/External/ExternalMcpService.cs

@@ -49,6 +49,15 @@ public sealed record WorktreeListItemDto(
 public sealed record CleanupWorktreeResult(
     bool Removed, string WorktreePath, bool BranchDeleted);
 
+public sealed record DailyPrepCandidateDto(
+    string Id, string ListId, string ListName, string Title, string? Description,
+    bool IsStarred, DateTime? ScheduledFor, DateTime CreatedAt);
+
+public sealed record DailyPrepDataDto(
+    int MaxTasks,
+    IReadOnlyList<DailyPrepCandidateDto> Candidates,
+    IReadOnlyList<DailyPrepCandidateDto> CurrentMyDay);
+
 [McpServerToolType]
 public sealed class ExternalMcpService
 {
@@ -482,6 +491,48 @@ public sealed class ExternalMcpService
         return new CleanupWorktreeResult(result.Removed, path, result.Removed);
     }
 
+    // ── Daily prep ───────────────────────────────────────────────────────────
+
+    [McpServerTool, Description(
+        "Daily prep: returns the open tasks eligible for today's MyDay selection. " +
+        "candidates = Idle, not blocked, in a git repo not excluded from the weekly report, and not already in MyDay. " +
+        "currentMyDay = Idle tasks already flagged IsMyDay (count them toward the cap). " +
+        "maxTasks = the hard cap on total open MyDay tasks. Use set_my_day to add tasks (never exceed maxTasks).")]
+    public async Task<DailyPrepDataDto> GetDailyPrepCandidates(CancellationToken cancellationToken)
+    {
+        await using var ctx = await _dbFactory.CreateDbContextAsync(cancellationToken);
+
+        var settings = await new AppSettingsRepository(ctx).GetAsync(cancellationToken);
+        var excludes = DailyPrepFilter.ParseExcludes(settings.ReportExcludedPaths);
+        var maxTasks = settings.DailyPrepMaxTasks < 1 ? 1 : settings.DailyPrepMaxTasks;
+
+        var idle = await ctx.Tasks
+            .AsNoTracking()
+            .Include(t => t.List)
+            .Where(t => t.Status == TaskStatus.Idle)
+            .ToListAsync(cancellationToken);
+
+        var currentMyDay = idle
+            .Where(t => t.IsMyDay)
+            .OrderBy(t => t.SortOrder)
+            .Select(ToCandidate)
+            .ToList();
+
+        var candidates = idle
+            .Where(t => !t.IsMyDay
+                        && t.BlockedByTaskId == null
+                        && DailyPrepFilter.IsIncludedRepo(t.List?.WorkingDir, excludes))
+            .OrderBy(t => t.CreatedAt)
+            .Select(ToCandidate)
+            .ToList();
+
+        return new DailyPrepDataDto(maxTasks, candidates, currentMyDay);
+    }
+
+    private static DailyPrepCandidateDto ToCandidate(TaskEntity t) => new(
+        t.Id, t.ListId, t.List?.Name ?? "", t.Title, t.Description,
+        t.IsStarred, t.ScheduledFor, t.CreatedAt);
+
     // ── Private helpers ───────────────────────────────────────────────────────
 
     private async Task<(TaskEntity Task, ListEntity List, WorktreeEntity Wt)> LoadWorktreeContextAsync(
@@ -569,3 +620,27 @@ public sealed class ExternalMcpService
         t.StartedAt,
         t.FinishedAt);
 }
+
+internal static class DailyPrepFilter
+{
+    public static string[] ParseExcludes(string? json)
+    {
+        if (string.IsNullOrWhiteSpace(json)) return [];
+        try
+        {
+            var list = System.Text.Json.JsonSerializer.Deserialize<List<string>>(json);
+            return list is null ? [] : list.Select(Normalize).Where(p => p.Length > 0).ToArray();
+        }
+        catch (System.Text.Json.JsonException) { return []; }
+    }
+
+    public static bool IsIncludedRepo(string? workingDir, string[] excludes)
+    {
+        if (string.IsNullOrWhiteSpace(workingDir)) return false;
+        var norm = Normalize(workingDir);
+        return !excludes.Any(p => norm.StartsWith(p, StringComparison.OrdinalIgnoreCase));
+    }
+
+    private static string Normalize(string path) =>
+        path.Trim().Replace('/', '\\').TrimEnd('\\');
+}