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, 31 insertions, 0 deletions

diff --git a/src/Agent.Core/Tools/ToolPolicy.cs b/src/Agent.Core/Tools/ToolPolicy.cs
new file mode 100644
index 0000000..c9f216a
--- /dev/null
+++ b/src/Agent.Core/Tools/ToolPolicy.cs
@@ -0,0 +1,31 @@
+using System.Text.Json;
+
+namespace Agent.Core.Tools;
+
+public sealed record ToolPolicyDecision(bool Allowed, string Reason)
+{
+    public static ToolPolicyDecision Allow() => new(true, "allowed");
+    public static ToolPolicyDecision Deny(string reason) => new(false, reason);
+}
+
+public interface IToolPolicyEngine
+{
+    ToolPolicyDecision Evaluate(string toolName, JsonElement arguments);
+}
+
+public interface IInternalToolBackend
+{
+    Task BeginTaskAsync(Guid taskId, CancellationToken cancellationToken) => Task.CompletedTask;
+    Task<ToolExecutionResult> ExecuteAsync(Guid taskId, string toolName, JsonElement arguments, CancellationToken cancellationToken);
+    Task EndTaskAsync(Guid taskId, bool success, CancellationToken cancellationToken) => Task.CompletedTask;
+}
+
+public sealed record ToolExecutionResult(bool Success, string Output, bool ExternalEffect, string? FailureFingerprint = null);
+
+public sealed class DenyByDefaultPolicy(IReadOnlySet<string>? allowedTools = null) : IToolPolicyEngine
+{
+    private readonly IReadOnlySet<string> _allowedTools = allowedTools ?? new HashSet<string>(StringComparer.Ordinal);
+    public ToolPolicyDecision Evaluate(string toolName, JsonElement arguments) => _allowedTools.Contains(toolName)
+        ? ToolPolicyDecision.Allow()
+        : ToolPolicyDecision.Deny("Capability is not allowed by policy.");
+}