Add new features and update configurations for improved functionality

test/tools/grep_tool_test.dart

@@ -0,0 +1,51 @@
+import "dart:io";
+
+import "package:clawd_code/src/tools/grep_tool.dart";
+import "package:test/test.dart";
+
+void main() {
+  late Directory tempDir;
+  late GrepTool tool;
+
+  setUp(() async {
+    tempDir = await Directory.systemTemp.createTemp("grep_tool_test_");
+    tool = GrepTool();
+  });
+
+  tearDown(() async {
+    if (await tempDir.exists()) {
+      await tempDir.delete(recursive: true);
+    }
+  });
+
+  group("GrepTool", () {
+    test("searches a direct file path", () async {
+      final file = File("${tempDir.path}/sample.txt");
+      await file.writeAsString("alpha\nbeta\nalpha again\n");
+
+      final result = await tool.execute({
+        "pattern": "alpha",
+        "path": file.path,
+        "output_mode": "content",
+      });
+
+      expect(result, contains("sample.txt:1:alpha"));
+      expect(result, contains("sample.txt:3:alpha again"));
+    });
+
+    test("searches a directory path", () async {
+      final nested = Directory("${tempDir.path}/nested");
+      await nested.create(recursive: true);
+      final file = File("${nested.path}/sample.txt");
+      await file.writeAsString("needle\n");
+
+      final result = await tool.execute({
+        "pattern": "needle",
+        "path": tempDir.path,
+        "output_mode": "files_with_matches",
+      });
+
+      expect(result, contains("nested/sample.txt"));
+    });
+  });
+}