diff --git a/packages/aft/lib/src/commands/generate/generate_workflows_command.dart b/packages/aft/lib/src/commands/generate/generate_workflows_command.dart
index 1ad1484b2c..aabceda218 100644
--- a/packages/aft/lib/src/commands/generate/generate_workflows_command.dart
+++ b/packages/aft/lib/src/commands/generate/generate_workflows_command.dart
@@ -119,10 +119,9 @@ ${dependentPackages.map((dep) => '      - dependency-name: "${dep.name}"').join(
     required String repoRelativePath,
     required List<PackageInfo> dependentPackages,
   }) async {
-    // Packages without a `lib/` folder generally contain only native code,
-    // e.g. `amplify_auth_cognito_android`. These packages are tested via their
-    // parent package, e.g. `amplify_flutter`, and do not require a workflow
-    // of their own.
+    // Packages without a `lib/` folder generally contain only native code.
+    // These packages are tested via their parent package and do not require
+    // a workflow of their own.
     final libDir = Directory(p.join(package.path, 'lib'));
     if (!libDir.existsSync()) {
       return;
@@ -134,9 +133,13 @@ ${dependentPackages.map((dep) => '      - dependency-name: "${dep.name}"').join(
       '${package.name}.yaml',
     );
     final workflowFile = File(workflowFilepath);
-    final customWorkflow = File(p.join(package.path, 'workflow.yaml'));
-    if (customWorkflow.existsSync()) {
-      customWorkflow.copySync(workflowFilepath);
+    if (package.pubspecInfo.config.aft?.github?.custom ?? false) {
+      if (!workflowFile.existsSync()) {
+        throw Exception(
+          'Package "${package.name}" sets `custom: true` but no workflow '
+          'file was found at: $workflowFilepath',
+        );
+      }
       return;
     }
     final isDartPackage = package.flavor == PackageFlavor.dart;
diff --git a/packages/aft/lib/src/config/config.dart b/packages/aft/lib/src/config/config.dart
index d009b167a8..e2fb5c3d8e 100644
--- a/packages/aft/lib/src/config/config.dart
+++ b/packages/aft/lib/src/config/config.dart
@@ -396,6 +396,12 @@ class PubspecInfo with AWSSerializable<Map<String, Object?>>, AWSDebuggable {
   /// The package's pubspec as a YAML map.
   final YamlMap pubspecMap;
 
+  /// Package-specific configuration.
+  @JsonKey(includeToJson: false, includeFromJson: false)
+  late final RawPubspecConfig config = RawPubspecConfig.fromJson(
+    pubspecMap.cast(),
+  );
+
   /// The pubspec as a YAML editor, used to alter dependencies or other info.
   @JsonKey(includeFromJson: false, includeToJson: false)
   late final YamlEditor pubspecYamlEditor = YamlEditor(pubspecYaml);
diff --git a/packages/aft/lib/src/config/config_loader.dart b/packages/aft/lib/src/config/config_loader.dart
index 8357b8f32a..cdb5f318be 100644
--- a/packages/aft/lib/src/config/config_loader.dart
+++ b/packages/aft/lib/src/config/config_loader.dart
@@ -55,29 +55,6 @@ class AftConfigLoader {
     return reload();
   }
 
-  Map<String, PackageInfo> _collectPackages({
-    required Directory rootDirectory,
-    required List<String> ignore,
-  }) {
-    final allDirs = rootDirectory
-        .listSync(recursive: true, followLinks: false)
-        .whereType<Directory>();
-    final allPackages = <PackageInfo>[];
-    for (final dir in allDirs) {
-      final package = PackageInfo.fromDirectory(dir);
-      if (package == null) {
-        continue;
-      }
-      if (ignore.contains(package.name)) {
-        continue;
-      }
-      allPackages.add(package);
-    }
-    return UnmodifiableMapView({
-      for (final package in allPackages..sort()) package.name: package,
-    });
-  }
-
   AftConfig _processPubspecs({
     required Queue<(YamlMap, Pubspec)> pubspecQueue,
     required Directory rootDirectory,
@@ -180,4 +157,26 @@ class AftConfigLoader {
 
     return aftConfig.build();
   }
+
+  /// Collects all packages in [rootDirectory] by recursively searching for directories
+  /// with a `pubspec.yaml`.
+  Map<String, PackageInfo> _collectPackages({
+    required Directory rootDirectory,
+    required List<String> ignore,
+  }) {
+    final allDirs = rootDirectory
+        .listSync(recursive: true, followLinks: false)
+        .whereType<Directory>();
+    final allPackages = <PackageInfo>[];
+    for (final dir in allDirs) {
+      final package = PackageInfo.fromDirectory(dir);
+      if (package == null || ignore.contains(package.name)) {
+        continue;
+      }
+      allPackages.add(package);
+    }
+    return UnmodifiableMapView({
+      for (final package in allPackages..sort()) package.name: package,
+    });
+  }
 }
diff --git a/packages/aft/lib/src/config/raw_config.dart b/packages/aft/lib/src/config/raw_config.dart
index bb021ce42b..040b41d102 100644
--- a/packages/aft/lib/src/config/raw_config.dart
+++ b/packages/aft/lib/src/config/raw_config.dart
@@ -75,6 +75,7 @@ class RawAftConfig with AWSSerializable<Map<String, Object?>>, AWSDebuggable {
     this.ignore = const [],
     this.components = const [],
     this.scripts = const {},
+    this.github,
   });
 
   factory RawAftConfig.fromJson(Map<String, Object?> json) =>
@@ -89,8 +90,12 @@ class RawAftConfig with AWSSerializable<Map<String, Object?>>, AWSDebuggable {
   /// {@macro aft.models.aft_component}
   final List<RawAftComponent> components;
 
+  /// Package- or repo-specific [AftScript]s.
   final Map<String, AftScript> scripts;
 
+  /// Package-specific GitHub configuration.
+  final GitHubPackageConfig? github;
+
   /// Retrieves the component for [packageName], if any.
   String componentForPackage(String packageName) {
     return components
@@ -268,6 +273,46 @@ abstract class MacOSEnvironment
       _$macOSEnvironmentSerializer;
 }
 
+abstract class GitHubPackageConfig
+    with AWSSerializable<Map<String, Object?>>, AWSDebuggable
+    implements Built<GitHubPackageConfig, GitHubPackageConfigBuilder> {
+  factory GitHubPackageConfig({
+    bool custom = false,
+  }) =>
+      _$GitHubPackageConfig._(custom: custom);
+
+  factory GitHubPackageConfig.build(
+    void Function(GitHubPackageConfigBuilder) updates,
+  ) = _$GitHubPackageConfig;
+
+  factory GitHubPackageConfig.fromJson(Map<String, Object?> json) =>
+      aftSerializers.deserializeWith(serializer, json)!;
+
+  const GitHubPackageConfig._();
+
+  @BuiltValueHook(initializeBuilder: true)
+  static void _initialize(GitHubPackageConfigBuilder b) {
+    b.custom = false;
+  }
+
+  /// Whether a custom workflow is being used.
+  ///
+  /// If this is `false`, one will be generated during `aft generate workflows`.
+  /// Otherwise, an assertion will be made that one is present for `package_name.yaml`
+  /// in the `.github/workflows` directory.
+  bool get custom;
+
+  @override
+  String get runtimeTypeName => 'GitHubPackageConfig';
+
+  @override
+  Map<String, Object?> toJson() =>
+      aftSerializers.serializeWith(serializer, this) as Map<String, Object?>;
+
+  static Serializer<GitHubPackageConfig> get serializer =>
+      _$gitHubPackageConfigSerializer;
+}
+
 /// Specifies how to propagate version changes within a component.
 enum VersionPropagation {
   /// Propagates only major version changes.
diff --git a/packages/aft/lib/src/config/raw_config.g.dart b/packages/aft/lib/src/config/raw_config.g.dart
index 48dab668b5..6f68dfb9f4 100644
--- a/packages/aft/lib/src/config/raw_config.g.dart
+++ b/packages/aft/lib/src/config/raw_config.g.dart
@@ -15,6 +15,8 @@ Serializer<IosEnvironment> _$iosEnvironmentSerializer =
     new _$IosEnvironmentSerializer();
 Serializer<MacOSEnvironment> _$macOSEnvironmentSerializer =
     new _$MacOSEnvironmentSerializer();
+Serializer<GitHubPackageConfig> _$gitHubPackageConfigSerializer =
+    new _$GitHubPackageConfigSerializer();
 
 class _$EnvironmentSerializer implements StructuredSerializer<Environment> {
   @override
@@ -255,6 +257,51 @@ class _$MacOSEnvironmentSerializer
   }
 }
 
+class _$GitHubPackageConfigSerializer
+    implements StructuredSerializer<GitHubPackageConfig> {
+  @override
+  final Iterable<Type> types = const [
+    GitHubPackageConfig,
+    _$GitHubPackageConfig
+  ];
+  @override
+  final String wireName = 'GitHubPackageConfig';
+
+  @override
+  Iterable<Object?> serialize(
+      Serializers serializers, GitHubPackageConfig object,
+      {FullType specifiedType = FullType.unspecified}) {
+    final result = <Object?>[
+      'custom',
+      serializers.serialize(object.custom, specifiedType: const FullType(bool)),
+    ];
+
+    return result;
+  }
+
+  @override
+  GitHubPackageConfig deserialize(
+      Serializers serializers, Iterable<Object?> serialized,
+      {FullType specifiedType = FullType.unspecified}) {
+    final result = new GitHubPackageConfigBuilder();
+
+    final iterator = serialized.iterator;
+    while (iterator.moveNext()) {
+      final key = iterator.current! as String;
+      iterator.moveNext();
+      final Object? value = iterator.current;
+      switch (key) {
+        case 'custom':
+          result.custom = serializers.deserialize(value,
+              specifiedType: const FullType(bool))! as bool;
+          break;
+      }
+    }
+
+    return result.build();
+  }
+}
+
 class _$Environment extends Environment {
   @override
   final VersionConstraint sdk;
@@ -711,6 +758,88 @@ class MacOSEnvironmentBuilder
   }
 }
 
+class _$GitHubPackageConfig extends GitHubPackageConfig {
+  @override
+  final bool custom;
+
+  factory _$GitHubPackageConfig(
+          [void Function(GitHubPackageConfigBuilder)? updates]) =>
+      (new GitHubPackageConfigBuilder()..update(updates))._build();
+
+  _$GitHubPackageConfig._({required this.custom}) : super._() {
+    BuiltValueNullFieldError.checkNotNull(
+        custom, r'GitHubPackageConfig', 'custom');
+  }
+
+  @override
+  GitHubPackageConfig rebuild(
+          void Function(GitHubPackageConfigBuilder) updates) =>
+      (toBuilder()..update(updates)).build();
+
+  @override
+  GitHubPackageConfigBuilder toBuilder() =>
+      new GitHubPackageConfigBuilder()..replace(this);
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(other, this)) return true;
+    return other is GitHubPackageConfig && custom == other.custom;
+  }
+
+  @override
+  int get hashCode {
+    var _$hash = 0;
+    _$hash = $jc(_$hash, custom.hashCode);
+    _$hash = $jf(_$hash);
+    return _$hash;
+  }
+}
+
+class GitHubPackageConfigBuilder
+    implements Builder<GitHubPackageConfig, GitHubPackageConfigBuilder> {
+  _$GitHubPackageConfig? _$v;
+
+  bool? _custom;
+  bool? get custom => _$this._custom;
+  set custom(bool? custom) => _$this._custom = custom;
+
+  GitHubPackageConfigBuilder() {
+    GitHubPackageConfig._initialize(this);
+  }
+
+  GitHubPackageConfigBuilder get _$this {
+    final $v = _$v;
+    if ($v != null) {
+      _custom = $v.custom;
+      _$v = null;
+    }
+    return this;
+  }
+
+  @override
+  void replace(GitHubPackageConfig other) {
+    ArgumentError.checkNotNull(other, 'other');
+    _$v = other as _$GitHubPackageConfig;
+  }
+
+  @override
+  void update(void Function(GitHubPackageConfigBuilder)? updates) {
+    if (updates != null) updates(this);
+  }
+
+  @override
+  GitHubPackageConfig build() => _build();
+
+  _$GitHubPackageConfig _build() {
+    final _$result = _$v ??
+        new _$GitHubPackageConfig._(
+            custom: BuiltValueNullFieldError.checkNotNull(
+                custom, r'GitHubPackageConfig', 'custom'));
+    replace(_$result);
+    return _$result;
+  }
+}
+
 // ignore_for_file: deprecated_member_use_from_same_package,type=lint
 
 // **************************************************************************
@@ -742,7 +871,13 @@ RawAftConfig _$RawAftConfigFromJson(Map json) => $checkedCreate(
       ($checkedConvert) {
         $checkKeys(
           json,
-          allowedKeys: const ['platforms', 'ignore', 'components', 'scripts'],
+          allowedKeys: const [
+            'platforms',
+            'ignore',
+            'components',
+            'scripts',
+            'github'
+          ],
         );
         final val = RawAftConfig(
           platforms: $checkedConvert(
@@ -774,6 +909,12 @@ RawAftConfig _$RawAftConfigFromJson(Map json) => $checkedCreate(
                             Map<String, Object?>.from(e as Map))),
                   ) ??
                   const {}),
+          github: $checkedConvert(
+              'github',
+              (v) => v == null
+                  ? null
+                  : GitHubPackageConfig.fromJson(
+                      Map<String, Object?>.from(v as Map))),
         );
         return val;
       },
@@ -785,6 +926,7 @@ Map<String, dynamic> _$RawAftConfigToJson(RawAftConfig instance) =>
       'ignore': instance.ignore,
       'components': instance.components.map((e) => e.toJson()).toList(),
       'scripts': instance.scripts.map((k, e) => MapEntry(k, e.toJson())),
+      'github': instance.github?.toJson(),
     };
 
 RawAftComponent _$RawAftComponentFromJson(Map json) => $checkedCreate(
diff --git a/packages/aft/lib/src/config/serializers.dart b/packages/aft/lib/src/config/serializers.dart
index 054956830e..a5e4748740 100644
--- a/packages/aft/lib/src/config/serializers.dart
+++ b/packages/aft/lib/src/config/serializers.dart
@@ -17,6 +17,7 @@ part 'serializers.g.dart';
   AndroidEnvironment,
   IosEnvironment,
   MacOSEnvironment,
+  GitHubPackageConfig,
 ])
 final Serializers aftSerializers = (_$aftSerializers.toBuilder()
       ..addPlugin(StandardJsonPlugin())
diff --git a/packages/aft/lib/src/config/serializers.g.dart b/packages/aft/lib/src/config/serializers.g.dart
index 452e457beb..f71d24f927 100644
--- a/packages/aft/lib/src/config/serializers.g.dart
+++ b/packages/aft/lib/src/config/serializers.g.dart
@@ -10,6 +10,7 @@ Serializers _$aftSerializers = (new Serializers().toBuilder()
       ..add(AftConfig.serializer)
       ..add(AndroidEnvironment.serializer)
       ..add(Environment.serializer)
+      ..add(GitHubPackageConfig.serializer)
       ..add(IosEnvironment.serializer)
       ..add(MacOSEnvironment.serializer)
       ..add(PlatformEnvironment.serializer)
diff --git a/packages/aft/pubspec.yaml b/packages/aft/pubspec.yaml
index 8b1f27046b..f5aa941441 100644
--- a/packages/aft/pubspec.yaml
+++ b/packages/aft/pubspec.yaml
@@ -73,3 +73,7 @@ dev_dependencies:
 
 executables:
   aft:
+
+aft:
+  github:
+    custom: true
diff --git a/packages/aft/workflow.yaml b/packages/aft/workflow.yaml
deleted file mode 100644
index 0aefd79d5e..0000000000
--- a/packages/aft/workflow.yaml
+++ /dev/null
@@ -1,53 +0,0 @@
-name: aft
-on:
-  push:
-    branches:
-      - main
-      - stable
-      - next
-    paths:
-      - "packages/aft/**/*.dart"
-  pull_request:
-    paths:
-      - "packages/aft/**/*.dart"
-  schedule:
-    - cron: "0 0 * * 0" # Every Sunday at 00:00
-defaults:
-  run:
-    shell: bash
-permissions: read-all
-
-jobs:
-  test:
-    name: Test
-    runs-on: ubuntu-latest
-    steps:
-      - name: Git Checkout
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # 3.6.0
-        with:
-          submodules: true
-
-      # Needed for `git` but only ever used locally.
-      - name: Git Config
-        run: |
-          git config --global user.email "amplify-flutter@amazon.com"
-          git config --global user.name "Amplify Flutter"
-
-      - name: Setup Dart
-        uses: dart-lang/setup-dart@e58aeb62aef51dcc4d0ba8eada7c08092aad5314 # main
-        with:
-          sdk: stable
-
-      - name: Get Packages
-        working-directory: packages/aft
-        run: dart pub upgrade
-
-      - name: Save Repo State
-        working-directory: packages/aft
-        run: |
-          dart pub get
-          dart bin/aft.dart save-repo-state
-
-      - name: Run Tests
-        working-directory: packages/aft
-        run: dart test
diff --git a/packages/aws_sdk/smoke_test/pubspec.yaml b/packages/aws_sdk/smoke_test/pubspec.yaml
index 0dbc44c8aa..4f6f4d4132 100644
--- a/packages/aws_sdk/smoke_test/pubspec.yaml
+++ b/packages/aws_sdk/smoke_test/pubspec.yaml
@@ -22,3 +22,7 @@ dev_dependencies:
   built_value_generator: 8.6.1
   lints: ^2.0.0
   test: ^1.22.1
+
+aft:
+  github:
+    custom: true
diff --git a/packages/aws_sdk/smoke_test/workflow.yaml b/packages/aws_sdk/smoke_test/workflow.yaml
deleted file mode 100644
index ed1c150963..0000000000
--- a/packages/aws_sdk/smoke_test/workflow.yaml
+++ /dev/null
@@ -1,65 +0,0 @@
-name: AWS SDK Smoke Tests
-on:
-  push:
-    branches:
-      - main
-      - stable
-      - next
-    paths:
-      - "packages/aws_sdk/**/*.dart"
-      - "packages/aws_sdk/smoke_test/workflow.yaml"
-      - "packages/smithy/**/*.dart"
-  pull_request:
-    paths:
-      - "packages/aws_sdk/**/*.dart"
-      - "packages/aws_sdk/smoke_test/workflow.yaml"
-      - "packages/smithy/**/*.dart"
-  schedule:
-    - cron: "0 0 * * 0" # Every Sunday at 00:00
-defaults:
-  run:
-    shell: bash
-permissions: read-all
-
-jobs:
-  smoke_test:
-    name: Smoke Test
-    runs-on: ubuntu-latest
-    steps:
-      - name: Git Checkout
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # 3.6.0
-
-      - name: Git Submodules
-        run: git submodule update --init
-
-      - name: Setup Dart
-        uses: dart-lang/setup-dart@e58aeb62aef51dcc4d0ba8eada7c08092aad5314 # main
-        with:
-          sdk: stable
-
-      - name: Link Packages
-        run: |
-          dart pub global activate -spath packages/aft
-          aft link
-
-      - name: Get Packages
-        run: dart pub upgrade
-        working-directory: packages/aws_sdk/smoke_test
-
-      - name: Install Localstack
-        run: |
-          # Workaround for dependency issue:
-          # https://github.com/localstack/localstack/pull/6831
-          pip install pyOpenSSL --upgrade
-          pip install cryptography --upgrade
-          pip install localstack
-
-          docker pull localstack/localstack:latest
-          localstack start --detached
-          echo "Waiting for localstack startup..."
-          localstack wait -t 30
-          echo "Startup complete"
-
-      - name: Run Tests
-        run: dart test
-        working-directory: packages/aws_sdk/smoke_test