diff --git a/Program.cs b/Program.cs
index 213763c..76777ff 100644
--- a/Program.cs
+++ b/Program.cs
@@ -87,6 +87,34 @@ var toolDefs = new[]
             },
             required = System.Array.Empty<string>()
         }
+    },
+    new
+    {
+        name = "delete_file",
+        description = "Löscht eine Datei oder ein leeres Verzeichnis.",
+        input_schema = new
+        {
+            type = "object",
+            properties = new Dictionary<string, object>
+            {
+                ["path"] = new { type = "string", description = "Relativer Pfad zur Datei oder zum Verzeichnis" }
+            },
+            required = new[] { "path" }
+        }
+    },
+    new
+    {
+        name = "execute",
+        description = "Führt einen Shell-Befehl im Workspace-Verzeichnis aus. Gibt stdout und stderr zurück. Timeout: 30 Sekunden.",
+        input_schema = new
+        {
+            type = "object",
+            properties = new Dictionary<string, object>
+            {
+                ["command"] = new { type = "string", description = "Shell-Befehl zum Ausführen" }
+            },
+            required = new[] { "command" }
+        }
     }
 };
 
@@ -100,7 +128,7 @@ string ResolvePath(string relativePath)
     return full;
 }
 
-string ExecuteTool(string name, JsonElement input)
+async Task<string> ExecuteTool(string name, JsonElement input)
 {
     switch (name)
     {
@@ -146,6 +174,61 @@ string ExecuteTool(string name, JsonElement input)
                 entries.Add(Path.GetRelativePath(workspaceRoot, file));
             return entries.Count == 0 ? "(leer)" : string.Join("\n", entries);
         }
+        case "delete_file":
+        {
+            var path = ResolvePath(input.GetProperty("path").GetString() ?? "");
+            if (File.Exists(path))
+            {
+                File.Delete(path);
+                return $"Datei gelöscht: {Path.GetRelativePath(workspaceRoot, path)}";
+            }
+            if (Directory.Exists(path))
+            {
+                Directory.Delete(path, recursive: false);
+                return $"Verzeichnis gelöscht: {Path.GetRelativePath(workspaceRoot, path)}";
+            }
+            return $"Fehler: Nicht gefunden: {Path.GetRelativePath(workspaceRoot, path)}";
+        }
+        case "execute":
+        {
+            var command = input.GetProperty("command").GetString() ?? "";
+            var psi = new System.Diagnostics.ProcessStartInfo
+            {
+                FileName = "/bin/bash",
+                WorkingDirectory = workspaceRoot,
+                RedirectStandardInput = true,
+                RedirectStandardOutput = true,
+                RedirectStandardError = true,
+                UseShellExecute = false,
+                CreateNoWindow = true
+            };
+            using var proc = System.Diagnostics.Process.Start(psi);
+            if (proc == null) return "Fehler: Prozess konnte nicht gestartet werden";
+            await proc.StandardInput.WriteAsync(command);
+            proc.StandardInput.Close();
+            var cts = new CancellationTokenSource(TimeSpan.FromSeconds(30));
+            try
+            {
+                await proc.WaitForExitAsync(cts.Token);
+            }
+            catch (OperationCanceledException)
+            {
+                proc.Kill(entireProcessTree: true);
+                return "Fehler: Timeout nach 30 Sekunden - Prozess abgebrochen";
+            }
+            var stdout = await proc.StandardOutput.ReadToEndAsync();
+            var stderr = await proc.StandardError.ReadToEndAsync();
+            var result = new StringBuilder();
+            if (!string.IsNullOrEmpty(stdout)) result.Append(stdout);
+            if (!string.IsNullOrEmpty(stderr))
+            {
+                if (result.Length > 0) result.Append("\n--- stderr ---\n");
+                result.Append(stderr);
+            }
+            if (result.Length == 0) result.Append($"(exit code {proc.ExitCode})");
+            else if (proc.ExitCode != 0) result.Append($"\n(exit code {proc.ExitCode})");
+            return result.ToString();
+        }
         default:
             return $"Fehler: Unbekanntes Tool: {name}";
     }
@@ -374,7 +457,7 @@ app.MapPost("/api/chat", async (HttpRequest req, HttpResponse res, IHttpClientFa
                             // Tool sofort ausführen und streamen
                             string toolResult;
                             bool isError = false;
-                            try { toolResult = ExecuteTool(currentToolName, inputEl); }
+                            try { toolResult = await ExecuteTool(currentToolName, inputEl); }
                             catch (Exception ex) { toolResult = $"Fehler: {ex.Message}"; isError = true; }
 
                             executedTools.Add((currentToolId, toolResult, isError));