diff --git a/.packages b/.packages
index cd51491172b..b88c3ba761f 100644
--- a/.packages
+++ b/.packages
@@ -33,6 +33,7 @@ dart2js_tools:pkg/dart2js_tools/lib
 dart2native:pkg/dart2native/lib
 dart_internal:pkg/dart_internal/lib
 dart_style:third_party/pkg_tested/dart_style/lib
+dartdev:pkg/dartdev/lib
 dartdoc:third_party/pkg/dartdoc/lib
 dartfix:pkg/dartfix/lib
 dev_compiler:pkg/dev_compiler/lib
diff --git a/pkg/dartdev/.gitignore b/pkg/dartdev/.gitignore
new file mode 100644
index 00000000000..96cf44bc4f2
--- /dev/null
+++ b/pkg/dartdev/.gitignore
@@ -0,0 +1,10 @@
+.buildlog
+.DS_Store
+.idea
+.project
+.settings/
+build/
+pubspec.lock
+
+# Directory created by dartdoc
+doc/api/
diff --git a/pkg/dartdev/CHANGELOG.md b/pkg/dartdev/CHANGELOG.md
new file mode 100644
index 00000000000..c93158c95a2
--- /dev/null
+++ b/pkg/dartdev/CHANGELOG.md
@@ -0,0 +1,2 @@
+## 0.0.1
+* Initial commit adding `pkg/dartdev/` to the Dart SDK with initial package files
\ No newline at end of file
diff --git a/pkg/dartdev/LICENSE b/pkg/dartdev/LICENSE
new file mode 100644
index 00000000000..18daf2b5bd9
--- /dev/null
+++ b/pkg/dartdev/LICENSE
@@ -0,0 +1,26 @@
+Copyright 2020, the Dart project authors. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google Inc. nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/pkg/dartdev/README.md b/pkg/dartdev/README.md
new file mode 100644
index 00000000000..c1aeeeb17b5
--- /dev/null
+++ b/pkg/dartdev/README.md
@@ -0,0 +1,7 @@
+# dartdev
+
+A command-line utility for Dart development.
+
+## Docs
+
+This tool is currently under active development.
\ No newline at end of file
diff --git a/pkg/dartdev/analysis_options.yaml b/pkg/dartdev/analysis_options.yaml
new file mode 100644
index 00000000000..84a5e26f95d
--- /dev/null
+++ b/pkg/dartdev/analysis_options.yaml
@@ -0,0 +1 @@
+include: package:pedantic/analysis_options.1.8.0.yaml
diff --git a/pkg/dartdev/bin/dartdev.dart b/pkg/dartdev/bin/dartdev.dart
new file mode 100644
index 00000000000..db8472912ae
--- /dev/null
+++ b/pkg/dartdev/bin/dartdev.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:args/command_runner.dart';
+import 'package:dartdev/dartdev.dart';
+
+/// The entry point for dartdev.
+main(List<String> args) async {
+  final runner = DartdevRunner();
+  try {
+    dynamic result = await runner.run(args);
+    exit(result is int ? result : 0);
+  } catch (e) {
+    if (e is UsageException) {
+      stderr.writeln('$e');
+      exit(64);
+    } else {
+      stderr.writeln('$e');
+      exit(1);
+    }
+  }
+}
diff --git a/pkg/dartdev/lib/dartdev.dart b/pkg/dartdev/lib/dartdev.dart
new file mode 100644
index 00000000000..84227995870
--- /dev/null
+++ b/pkg/dartdev/lib/dartdev.dart
@@ -0,0 +1,32 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:args/args.dart';
+import 'package:args/command_runner.dart';
+import 'package:cli_util/cli_logging.dart';
+
+import 'src/commands/format.dart';
+import 'src/core.dart';
+
+class DartdevRunner extends CommandRunner {
+  static const String dartdevDescription =
+      'A command-line utility for Dart development';
+
+  DartdevRunner() : super('dartdev', '$dartdevDescription.') {
+    argParser.addFlag('verbose',
+        abbr: 'v', negatable: false, help: 'Show verbose output.');
+
+    // The list of currently supported commands:
+    addCommand(FormatCommand());
+  }
+
+  @override
+  Future runCommand(ArgResults results) async {
+    isVerbose = results['verbose'];
+
+    log = isVerbose ? Logger.verbose(ansi: ansi) : Logger.standard(ansi: ansi);
+
+    return await super.runCommand(results);
+  }
+}
diff --git a/pkg/dartdev/lib/src/commands/format.dart b/pkg/dartdev/lib/src/commands/format.dart
new file mode 100644
index 00000000000..97c2d7dd63b
--- /dev/null
+++ b/pkg/dartdev/lib/src/commands/format.dart
@@ -0,0 +1,24 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import '../core.dart';
+import '../sdk.dart';
+
+class FormatCommand extends DartdevCommand {
+  FormatCommand() : super('format', 'Format one or more Dart files.') {
+    // TODO(jwren) add all options and flags
+  }
+
+  @override
+  run() async {
+    // TODO(jwren) implement verbose in dart_style
+    // dartfmt doesn't have '-v' or '--verbose', so remove from the argument list
+    var args = List.from(argResults.arguments)
+      ..remove('-v')
+      ..remove('--verbose');
+    var process = await startProcess(sdk.dartfmt, args);
+    routeToStdout(process);
+    return process.exitCode;
+  }
+}
diff --git a/pkg/dartdev/lib/src/core.dart b/pkg/dartdev/lib/src/core.dart
new file mode 100644
index 00000000000..b937f198754
--- /dev/null
+++ b/pkg/dartdev/lib/src/core.dart
@@ -0,0 +1,82 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:args/command_runner.dart';
+import 'package:cli_util/cli_logging.dart';
+
+Ansi ansi = Ansi(Ansi.terminalSupportsAnsi);
+Logger log;
+bool isVerbose = false;
+
+abstract class DartdevCommand extends Command {
+  final String _name;
+  final String _description;
+
+  DartdevCommand(this._name, this._description);
+
+  @override
+  String get name => _name;
+
+  @override
+  String get description => _description;
+}
+
+Future<Process> startProcess(
+  String executable,
+  List<String> arguments, {
+  String cwd,
+}) {
+  log.trace('$executable ${arguments.join(' ')}');
+  return Process.start(executable, arguments, workingDirectory: cwd);
+}
+
+void routeToStdout(
+  Process process, {
+  bool logToTrace = false,
+  void listener(String str),
+}) {
+  if (isVerbose) {
+    _streamLineTransform(process.stdout, (String line) {
+      logToTrace ? log.trace(line.trimRight()) : log.stdout(line.trimRight());
+      if (listener != null) listener(line);
+    });
+    _streamLineTransform(process.stderr, (String line) {
+      log.stderr(line.trimRight());
+      if (listener != null) listener(line);
+    });
+  } else {
+    _streamLineTransform(process.stdout, (String line) {
+      logToTrace ? log.trace(line.trimRight()) : log.stdout(line.trimRight());
+      if (listener != null) listener(line);
+    });
+
+    _streamLineTransform(process.stderr, (String line) {
+      log.stderr(line.trimRight());
+      if (listener != null) listener(line);
+    });
+  }
+}
+
+void routeToStdoutStreaming(Process process) {
+  if (isVerbose) {
+    _streamLineTransform(
+        process.stdout, (line) => log.stdout(line.trimRight()));
+    _streamLineTransform(
+        process.stderr, (line) => log.stderr(line.trimRight()));
+  } else {
+    process.stdout.listen((List<int> data) => stdout.add(data));
+    _streamLineTransform(
+        process.stderr, (line) => log.stderr(line.trimRight()));
+  }
+}
+
+void _streamLineTransform(Stream<List<int>> stream, handler(String line)) {
+  stream
+      .transform(utf8.decoder)
+      .transform(const LineSplitter())
+      .listen(handler);
+}
diff --git a/pkg/dartdev/lib/src/sdk.dart b/pkg/dartdev/lib/src/sdk.dart
new file mode 100644
index 00000000000..73afe8d3284
--- /dev/null
+++ b/pkg/dartdev/lib/src/sdk.dart
@@ -0,0 +1,31 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:cli_util/cli_util.dart';
+import 'package:path/path.dart' as path;
+
+final Sdk sdk = Sdk();
+
+/// A utility class for finding and referencing paths within the Dart SDK.
+class Sdk {
+  final String dir;
+
+  Sdk() : dir = getSdkPath();
+
+  String get dart => path.join(dir, 'bin', _exeName('dart'));
+
+  String get dartanalyzer => path.join(dir, 'bin', _binName('dartanalyzer'));
+
+  String get dartfmt => path.join(dir, 'bin', _binName('dartfmt'));
+
+  String get pub => path.join(dir, 'bin', _binName('pub'));
+
+  static String _binName(String base) =>
+      Platform.isWindows ? '$base.bat' : base;
+
+  static String _exeName(String base) =>
+      Platform.isWindows ? '$base.exe' : base;
+}
diff --git a/pkg/dartdev/lib/src/utils.dart b/pkg/dartdev/lib/src/utils.dart
new file mode 100644
index 00000000000..0918d816696
--- /dev/null
+++ b/pkg/dartdev/lib/src/utils.dart
@@ -0,0 +1,32 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:intl/intl.dart';
+import 'package:path/path.dart' as path;
+
+/// The directory used to store per-user settings for Dart tooling.
+Directory getDartPrefsDirectory() {
+  return Directory(path.join(getUserHomeDir(), '.dart'));
+}
+
+/// Return the user's home directory.
+String getUserHomeDir() {
+  String envKey = Platform.operatingSystem == 'windows' ? 'APPDATA' : 'HOME';
+  String value = Platform.environment[envKey];
+  return value == null ? '.' : value;
+}
+
+/// A typedef to represent a function taking no arguments and with no return
+/// value.
+typedef void VoidFunction();
+
+final NumberFormat _numberFormat = NumberFormat.decimalPattern();
+
+/// Convert the given number to a string using the current locale.
+String formatNumber(int i) => _numberFormat.format(i);
+
+/// Emit the given word with the correct pluralization.
+String pluralize(String word, int count) => count == 1 ? word : '${word}s';
diff --git a/pkg/dartdev/pubspec.yaml b/pkg/dartdev/pubspec.yaml
new file mode 100644
index 00000000000..65aaee20d59
--- /dev/null
+++ b/pkg/dartdev/pubspec.yaml
@@ -0,0 +1,18 @@
+name: dartdev
+
+# This package is not intended to be published
+publish_to: none
+
+environment:
+  sdk: '>=2.6.0 <3.0.0'
+dependencies:
+  args: ^1.5.2
+  cli_util: ^0.1.0
+  intl: ^0.16.0
+  path: ^1.6.2
+  watcher: ^0.9.7+13
+  yaml: ^2.2.0
+
+dev_dependencies:
+  test: ^1.0.0
+  pedantic: ^1.8.0
\ No newline at end of file
diff --git a/pkg/dartdev/test/command_test.dart b/pkg/dartdev/test/command_test.dart
new file mode 100644
index 00000000000..d49fec4dcf0
--- /dev/null
+++ b/pkg/dartdev/test/command_test.dart
@@ -0,0 +1,66 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart';
+
+// TODO(jwren) move the following test utilities to a separate file
+
+// Files that end in _test.dart must have a main method to satisfy the dart2js
+// bots
+void main() {
+  test('empty test for dart2js', () {
+    assert(true == true);
+  });
+}
+
+TestProject project({String mainSrc}) => TestProject(mainSrc: mainSrc);
+
+class TestProject {
+  Directory dir;
+
+  static String get defaultProjectName => 'dartdev_temp';
+
+  String get name => defaultProjectName;
+
+  TestProject({String mainSrc}) {
+    dir = Directory.systemTemp.createTempSync('dartdev');
+    if (mainSrc != null) {
+      file('lib/main.dart', mainSrc);
+    }
+    file('pubspec.yaml', 'name: $name\ndev_dependencies:\n  test: any\n');
+  }
+
+  void file(String name, String contents) {
+    var file = File(path.join(dir.path, name));
+    file.parent.createSync();
+    file.writeAsStringSync(contents);
+  }
+
+  void dispose() {
+    dir.deleteSync(recursive: true);
+  }
+
+  ProcessResult run(String command, [List<String> args]) {
+    var arguments = [
+      path.absolute(path.join(Directory.current.path, 'bin', 'dartdev.dart')),
+      command
+    ];
+    if (args != null && args.isNotEmpty) {
+      arguments.addAll(args);
+    }
+    return Process.runSync(
+      Platform.resolvedExecutable,
+      arguments,
+      workingDirectory: dir.path,
+    );
+  }
+
+  File findFile(String name) {
+    var file = File(path.join(dir.path, name));
+    return file.existsSync() ? file : null;
+  }
+}
diff --git a/pkg/dartdev/test/utils_test.dart b/pkg/dartdev/test/utils_test.dart
new file mode 100644
index 00000000000..5850905ebee
--- /dev/null
+++ b/pkg/dartdev/test/utils_test.dart
@@ -0,0 +1,22 @@
+// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:dartdev/src/utils.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('pluralize', () {
+    test('zero', () {
+      expect(pluralize('cat', 0), 'cats');
+    });
+
+    test('one', () {
+      expect(pluralize('cat', 1), 'cat');
+    });
+
+    test('many', () {
+      expect(pluralize('cat', 2), 'cats');
+    });
+  });
+}
diff --git a/tools/bots/test_matrix.json b/tools/bots/test_matrix.json
index 1d2a195af5b..09243e8302a 100644
--- a/tools/bots/test_matrix.json
+++ b/tools/bots/test_matrix.json
@@ -2403,6 +2403,11 @@
           "script": "out/ReleaseX64/dart-sdk/bin/dartanalyzer",
           "arguments": ["--fatal-warnings", "pkg/compiler"]
         },
+        {
+          "name": "analyze pkg/dartdev",
+          "script": "out/ReleaseX64/dart-sdk/bin/dartanalyzer",
+          "arguments": ["--fatal-warnings", "pkg/dartdev"]
+        },
         {
           "name": "analyze pkg/dart2js_tools",
           "script": "out/ReleaseX64/dart-sdk/bin/dartanalyzer",