diff --git a/src/ClaudeDo.Worker/External/RunHistoryMcpTools.cs b/src/ClaudeDo.Worker/External/RunHistoryMcpTools.cs
new file mode 100644
index 0000000..70b50e0
--- /dev/null
+++ b/src/ClaudeDo.Worker/External/RunHistoryMcpTools.cs
@@ -0,0 +1,51 @@
+using System.ComponentModel;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Data.Repositories;
+using ModelContextProtocol.Server;
+
+namespace ClaudeDo.Worker.External;
+
+public sealed record RunDto(
+    string Id, int RunNumber, string? SessionId, bool IsRetry,
+    string? ResultMarkdown, string? StructuredOutputJson, string? ErrorMarkdown,
+    int? ExitCode, int? TurnCount, int? TokensIn, int? TokensOut,
+    DateTime? StartedAt, DateTime? FinishedAt);
+
+[McpServerToolType]
+public sealed class RunHistoryMcpTools
+{
+    private readonly TaskRunRepository _runs;
+
+    public RunHistoryMcpTools(TaskRunRepository runs) => _runs = runs;
+
+    [McpServerTool, Description("List all execution runs for a task (newest run metadata, tokens, turns, result, error).")]
+    public async Task<IReadOnlyList<RunDto>> ListRuns(string taskId, CancellationToken cancellationToken)
+    {
+        var runs = await _runs.GetByTaskIdAsync(taskId, cancellationToken);
+        return runs.Select(ToDto).ToList();
+    }
+
+    [McpServerTool, Description("Get a single execution run by its run id.")]
+    public async Task<RunDto> GetRun(string runId, CancellationToken cancellationToken)
+    {
+        var run = await _runs.GetByIdAsync(runId, cancellationToken)
+            ?? throw new InvalidOperationException($"Run {runId} not found.");
+        return ToDto(run);
+    }
+
+    [McpServerTool, Description("Fetch the raw log output of a task's latest run. Throws if no log is available.")]
+    public async Task<string> GetTaskLog(string taskId, CancellationToken cancellationToken)
+    {
+        var run = await _runs.GetLatestByTaskIdAsync(taskId, cancellationToken)
+            ?? throw new InvalidOperationException($"No runs found for task {taskId}.");
+        if (string.IsNullOrWhiteSpace(run.LogPath) || !File.Exists(run.LogPath))
+            throw new InvalidOperationException("No log available for the latest run.");
+        return await File.ReadAllTextAsync(run.LogPath, cancellationToken);
+    }
+
+    private static RunDto ToDto(TaskRunEntity r) => new(
+        r.Id, r.RunNumber, r.SessionId, r.IsRetry,
+        r.ResultMarkdown, r.StructuredOutputJson, r.ErrorMarkdown,
+        r.ExitCode, r.TurnCount, r.TokensIn, r.TokensOut,
+        r.StartedAt, r.FinishedAt);
+}
diff --git a/tests/ClaudeDo.Worker.Tests/External/RunHistoryMcpToolsTests.cs b/tests/ClaudeDo.Worker.Tests/External/RunHistoryMcpToolsTests.cs
new file mode 100644
index 0000000..71649c2
--- /dev/null
+++ b/tests/ClaudeDo.Worker.Tests/External/RunHistoryMcpToolsTests.cs
@@ -0,0 +1,84 @@
+using ClaudeDo.Data;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.External;
+using ClaudeDo.Worker.Tests.Infrastructure;
+
+namespace ClaudeDo.Worker.Tests.External;
+
+public sealed class RunHistoryMcpToolsTests : IDisposable
+{
+    private readonly DbFixture _db = new();
+    private readonly ClaudeDoDbContext _ctx;
+    private readonly TaskRunRepository _runs;
+    private readonly RunHistoryMcpTools _sut;
+
+    public RunHistoryMcpToolsTests()
+    {
+        _ctx = _db.CreateContext();
+        _runs = new TaskRunRepository(_ctx);
+        _sut = new RunHistoryMcpTools(_runs);
+    }
+
+    public void Dispose() { _ctx.Dispose(); _db.Dispose(); }
+
+    private async Task SeedTaskAsync(string taskId)
+    {
+        var lists = new ListRepository(_ctx);
+        var tasks = new TaskRepository(_ctx);
+        var listId = Guid.NewGuid().ToString();
+        await lists.AddAsync(new ListEntity { Id = listId, Name = "L", CreatedAt = DateTime.UtcNow });
+        await tasks.AddAsync(new TaskEntity
+        {
+            Id = taskId, ListId = listId, Title = "t",
+            Status = ClaudeDo.Data.Models.TaskStatus.Done, CreatedAt = DateTime.UtcNow, CommitType = "chore",
+        });
+    }
+
+    [Fact]
+    public async Task ListRuns_ReturnsProjectedRuns()
+    {
+        var taskId = Guid.NewGuid().ToString();
+        await SeedTaskAsync(taskId);
+        await _runs.AddAsync(new TaskRunEntity
+        {
+            Id = Guid.NewGuid().ToString(), TaskId = taskId, RunNumber = 1,
+            IsRetry = false, Prompt = "p", ResultMarkdown = "done", TokensIn = 10, TokensOut = 20,
+        });
+
+        var list = await _sut.ListRuns(taskId, CancellationToken.None);
+
+        Assert.Single(list);
+        Assert.Equal("done", list[0].ResultMarkdown);
+        Assert.Equal(10, list[0].TokensIn);
+    }
+
+    [Fact]
+    public async Task GetTaskLog_NoLog_Throws()
+    {
+        var taskId = Guid.NewGuid().ToString();
+        await SeedTaskAsync(taskId);
+
+        await Assert.ThrowsAsync<InvalidOperationException>(() =>
+            _sut.GetTaskLog(taskId, CancellationToken.None));
+    }
+
+    [Fact]
+    public async Task GetTaskLog_ReadsLatestRunLogFile()
+    {
+        var taskId = Guid.NewGuid().ToString();
+        await SeedTaskAsync(taskId);
+        var logPath = Path.Combine(Path.GetTempPath(), $"claudedo_log_{Guid.NewGuid():N}.txt");
+        await File.WriteAllTextAsync(logPath, "hello log");
+        await _runs.AddAsync(new TaskRunEntity
+        {
+            Id = Guid.NewGuid().ToString(), TaskId = taskId, RunNumber = 1,
+            IsRetry = false, Prompt = "p", LogPath = logPath,
+        });
+
+        var content = await _sut.GetTaskLog(taskId, CancellationToken.None);
+
+        Assert.Equal("hello log", content);
+        File.Delete(logPath);
+    }
+}