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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.");
}
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