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, 20 insertions, 0 deletions

diff --git a/src/Agent.Windows/Security/UserOnlyDirectory.cs b/src/Agent.Windows/Security/UserOnlyDirectory.cs
new file mode 100644
index 0000000..a9ae5ae
--- /dev/null
+++ b/src/Agent.Windows/Security/UserOnlyDirectory.cs
@@ -0,0 +1,20 @@
+using System.Security.AccessControl;
+using System.Security.Principal;
+
+namespace Agent.Windows.Security;
+
+public static class UserOnlyDirectory
+{
+    public static void Ensure(string path)
+    {
+        Directory.CreateDirectory(path);
+        using WindowsIdentity identity = WindowsIdentity.GetCurrent();
+        SecurityIdentifier user = identity.User ?? throw new InvalidOperationException("Current Windows identity has no user SID.");
+        var security = new DirectorySecurity();
+        security.SetOwner(user);
+        security.SetAccessRuleProtection(isProtected: true, preserveInheritance: false);
+        security.AddAccessRule(new FileSystemAccessRule(user, FileSystemRights.FullControl,
+            InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));
+        FileSystemAclExtensions.SetAccessControl(new DirectoryInfo(path), security);
+    }
+}