Initial commit to new repository

src/AxCopilot/Services/Agent/MarkdownSkill.cs

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+using System.IO;
+using System.Text;
+using System.Text.Json;
+
+namespace AxCopilot.Services.Agent;
+
+/// <summary>
+/// Markdown (.md) 문서를 생성하는 내장 스킬.
+/// LLM이 마크다운 내용을 전달하면 파일로 저장합니다.
+/// </summary>
+public class MarkdownSkill : IAgentTool
+{
+    public string Name => "markdown_create";
+    public string Description => "Create a Markdown (.md) document file. Provide the content in Markdown format.";
+
+    public ToolParameterSchema Parameters => new()
+    {
+        Properties = new()
+        {
+            ["path"] = new() { Type = "string", Description = "Output file path (.md). Relative to work folder." },
+            ["content"] = new() { Type = "string", Description = "Markdown content to write" },
+            ["title"] = new() { Type = "string", Description = "Optional document title. If provided, prepends '# title' at the top." },
+        },
+        Required = ["path", "content"]
+    };
+
+    public async Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct)
+    {
+        var path = args.GetProperty("path").GetString() ?? "";
+        var content = args.GetProperty("content").GetString() ?? "";
+        var title = args.TryGetProperty("title", out var t) ? t.GetString() : null;
+
+        var fullPath = FileReadTool.ResolvePath(path, context.WorkFolder);
+        if (context.ActiveTab == "Cowork") fullPath = AgentContext.EnsureTimestampedPath(fullPath);
+        if (!fullPath.EndsWith(".md", StringComparison.OrdinalIgnoreCase))
+            fullPath += ".md";
+
+        if (!context.IsPathAllowed(fullPath))
+            return ToolResult.Fail($"경로 접근 차단: {fullPath}");
+
+        if (!await context.CheckWritePermissionAsync(Name, fullPath))
+            return ToolResult.Fail($"쓰기 권한 거부: {fullPath}");
+
+        try
+        {
+            var dir = Path.GetDirectoryName(fullPath);
+            if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
+
+            var sb = new StringBuilder();
+            if (!string.IsNullOrEmpty(title))
+            {
+                sb.AppendLine($"# {title}");
+                sb.AppendLine();
+            }
+            sb.Append(content);
+
+            await File.WriteAllTextAsync(fullPath, sb.ToString(), Encoding.UTF8, ct);
+
+            var lines = sb.ToString().Split('\n').Length;
+            return ToolResult.Ok(
+                $"Markdown 문서 저장 완료: {fullPath} ({lines} lines)",
+                fullPath);
+        }
+        catch (Exception ex)
+        {
+            return ToolResult.Fail($"Markdown 저장 실패: {ex.Message}");
+        }
+    }
+}