Initial commit to new repository

src/AxCopilot/Services/Agent/MathTool.cs

@@ -0,0 +1,66 @@
+using System.Data;
+using System.Text.Json;
+
+namespace AxCopilot.Services.Agent;
+
+/// <summary>수학 수식을 계산하는 도구.</summary>
+public class MathTool : IAgentTool
+{
+    public string Name => "math_eval";
+    public string Description =>
+        "Evaluate a mathematical expression and return the result. " +
+        "Supports: +, -, *, /, %, parentheses, and common math operations. " +
+        "Use for calculations, unit conversions, and numeric analysis.";
+
+    public ToolParameterSchema Parameters => new()
+    {
+        Properties = new()
+        {
+            ["expression"] = new()
+            {
+                Type = "string",
+                Description = "Mathematical expression to evaluate (e.g. '(100 * 1.08) / 3')",
+            },
+            ["precision"] = new()
+            {
+                Type = "integer",
+                Description = "Decimal places for rounding (default: 6)",
+            },
+        },
+        Required = ["expression"],
+    };
+
+    public Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct = default)
+    {
+        var expression = args.GetProperty("expression").GetString() ?? "";
+        var precision = args.TryGetProperty("precision", out var p) ? p.GetInt32() : 6;
+
+        if (string.IsNullOrWhiteSpace(expression))
+            return Task.FromResult(ToolResult.Fail("수식이 비어 있습니다."));
+
+        try
+        {
+            // DataTable.Compute를 사용한 안전한 수식 평가
+            var sanitized = expression
+                .Replace("^", " ") // XOR 방지 — ** 패턴은 아래에서 처리
+                .Replace("Math.", "")
+                .Replace("System.", "");
+
+            // 기본 보안 검사: 알파벳 함수 호출 차단
+            if (System.Text.RegularExpressions.Regex.IsMatch(sanitized, @"[a-zA-Z]{3,}"))
+                return Task.FromResult(ToolResult.Fail("함수 호출은 지원하지 않습니다. 기본 사칙연산만 가능합니다."));
+
+            var dt = new DataTable();
+            var result = dt.Compute(sanitized, null);
+            var value = Convert.ToDouble(result);
+            var rounded = Math.Round(value, precision);
+
+            return Task.FromResult(ToolResult.Ok(
+                $"Expression: {expression}\nResult: {rounded}"));
+        }
+        catch (Exception ex)
+        {
+            return Task.FromResult(ToolResult.Fail($"수식 평가 오류: {ex.Message}"));
+        }
+    }
+}