feat: AI Agent Sandbox MCP Server v1を実装

Specifications、Design、ImplementationPlanの優先順位を整理し、単一Task実行モデル、typed option優先、設定可能なresource上限、local Ollamaを必須とするRelease Gateを文書化。

.NET 10/C# 14の5 production project、3 test project、E2E Clientを構築。typed YAML、en/ja locale、fixed/user prompt、stdioおよびloopback限定Streamable HTTP、agent_run/agent_status、Session、Ollama text/tool/Vision、TaskGraphとtoken accountingを実装。

Windows sandboxとしてfixed AppContainer、canonical/reparse検査、能力別ACL、path+SHA-256 executable approval、child-process restriction、Job Object、task journal、atomic file transaction、crash recoveryを実装。WFPのIPv4/IPv6 default denyとexact allow、dynamic session、temporary loopback exemption、管理者/BFE診断を追加。

Security/Recovery test、MCP/Ollama integration test、stdio/HTTP Operational E2E、Release Bundle生成・checksum・manifest・fresh extraction検査を追加。Requirement TraceabilityとPhase 0〜11の進捗、初回セットアップ可能なREADMEを整備。

Debug/Release/publish/objをrepository rootのbuild/へ集約し、旧project-local bin/objへの依存を除去。artifacts/とbuild/をGit管理外に設定し、clean checkoutでもsolution buildからE2E Clientまで生成可能にした。

1 files changed, 90 insertions, 0 deletions

diff --git a/src/Agent.Mcp/AgentTools.cs b/src/Agent.Mcp/AgentTools.cs
new file mode 100644
index 0000000..c44d6ec
--- /dev/null
+++ b/src/Agent.Mcp/AgentTools.cs
@@ -0,0 +1,90 @@
+using System.ComponentModel;
+using Agent.Core.Localization;
+using Agent.Core.Tasks;
+using ModelContextProtocol.Server;
+using ModelContextProtocol.Protocol;
+
+namespace Agent.Mcp;
+
+[McpServerToolType]
+public sealed class AgentTools(TaskRegistry registry, LocaleCatalog locale, VisionLimits visionLimits)
+{
+    [McpServerTool(Name = "agent_run", ReadOnly = false, Destructive = true, OpenWorld = false, UseStructuredContent = false)]
+    [Description("Queue a natural-language request for asynchronous execution.")]
+    public string AgentRun(
+        RequestContext<CallToolRequestParams> context,
+        [Description("Non-empty natural-language work request.")] string request,
+        [Description("Existing session UUID, or omit to create a session.")] Guid? session_id = null,
+        [Description("Task-scoped temperature from 0.0 through 2.0.")] double? temperature = null,
+        [Description("Optional PNG, JPEG, or WebP images.")] IReadOnlyList<McpImageInput>? images = null)
+    {
+        RequireOnly(context, "request", "session_id", "temperature", "images");
+        ValidateImages(images);
+        TaskSnapshot task = registry.Enqueue(request, session_id, temperature, images?.Select(static image => image.DataBase64).ToArray());
+        string message = locale.Format("mcp.task_queued", new Dictionary<string, object?>
+        {
+            ["task"] = task.TaskId,
+            ["session"] = task.SessionId
+        });
+        return string.Join('\n',
+            $"task_id: {task.TaskId}",
+            $"session_id: {task.SessionId}",
+            "status: queued",
+            $"message: {message}");
+    }
+
+    private void ValidateImages(IReadOnlyList<McpImageInput>? images)
+    {
+        if (images is null) return;
+        if (images.Count > visionLimits.MaxCount) throw new ArgumentException($"Image count exceeds configured limit {visionLimits.MaxCount}.");
+        long total = 0;
+        foreach (McpImageInput image in images)
+        {
+            if (image.MimeType is not ("image/png" or "image/jpeg" or "image/webp")) throw new ArgumentException($"Unsupported image MIME type '{image.MimeType}'.");
+            byte[] bytes;
+            try { bytes = Convert.FromBase64String(image.DataBase64); }
+            catch (FormatException ex) { throw new ArgumentException("Image data_base64 is invalid.", ex); }
+            if (bytes.LongLength > visionLimits.MaxBytesEach) throw new ArgumentException($"Image exceeds configured per-image limit {visionLimits.MaxBytesEach} bytes.");
+            total = checked(total + bytes.LongLength);
+            if (total > visionLimits.MaxTotalBytes) throw new ArgumentException($"Images exceed configured total limit {visionLimits.MaxTotalBytes} bytes.");
+        }
+    }
+
+    [McpServerTool(Name = "agent_status", ReadOnly = true, Destructive = false, OpenWorld = false, UseStructuredContent = false)]
+    [Description("Get the current state and result of a queued agent task.")]
+    public string AgentStatus(
+        RequestContext<CallToolRequestParams> context,
+        [Description("Task UUID returned by agent_run.")] Guid task_id,
+        [Description("Optional session UUID used to verify task ownership.")] Guid? session_id = null)
+    {
+        RequireOnly(context, "task_id", "session_id");
+        if (!registry.TryGet(task_id, session_id, out TaskSnapshot? task) || task is null)
+        {
+            return string.Join('\n',
+                $"task_id: {task_id}",
+                "status: failed",
+                $"message: {locale.Format("mcp.task_not_found", new Dictionary<string, object?> { ["task"] = task_id })}");
+        }
+
+        string state = task.State.ToString().ToLowerInvariant();
+        bool terminal = task.State is AgentTaskState.Completed or AgentTaskState.Failed or AgentTaskState.Cancelled;
+        return string.Join('\n',
+            $"task_id: {task.TaskId}",
+            $"session_id: {task.SessionId}",
+            $"status: {state}",
+            $"completed_tasks: {task.CompletedTasks}/{task.TotalTasks}",
+            $"current_task: {task.CurrentTask ?? string.Empty}",
+            $"token_usage: input={task.InputTokens} output={task.OutputTokens} total={task.InputTokens + task.OutputTokens}",
+            $"critical_path_tokens: {task.CriticalPathTokens.ToString(System.Globalization.CultureInfo.InvariantCulture)}",
+            $"message: {locale.Get("mcp.status." + state)}",
+            terminal ? $"result: {task.Result}" : "result:");
+    }
+
+    private static void RequireOnly(RequestContext<CallToolRequestParams> context, params string[] allowed)
+    {
+        if (context.Params?.Arguments is null) return;
+        HashSet<string> allowedSet = allowed.ToHashSet(StringComparer.Ordinal);
+        string? unknown = context.Params.Arguments.Keys.FirstOrDefault(key => !allowedSet.Contains(key));
+        if (unknown is not null) throw new ArgumentException($"Unknown tool property '{unknown}'.");
+    }
+}