diff --git a/.gitignore b/.gitignore
index 024b8d0..3de6a41 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 .env
 
 node_modules/
+
+todo.md
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 9156efe..15c8a1a 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -32,12 +32,15 @@ dependencies = [
     "langfuse>=3.10.1",
     # MCP (Model Context Protocol)
     "fastmcp>=2.14.1",
-    # Security: CVE-2025-66418, CVE-2025-66471 対応
-    "urllib3>=2.6.0",
+    # Security Fix
+    "urllib3>=2.6.3",
     # Security: CVE-2025-68480 対応
     "marshmallow>=3.26.2",
-    # Security: GHSA-w853-jp5j-5j7f 対応
-    "filelock>=3.20.1",
+    # Security Fix
+    "filelock>=3.20.3",
+    "pyasn1>=0.6.2", # Security Fix
+    # Security Fix
+    "aiohttp>=3.13.3",
 ]
 
 [project.optional-dependencies]
diff --git a/backend/uv.lock b/backend/uv.lock
index d6cd56a..97f8906 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -18,7 +18,7 @@ wheels = [
 
 [[package]]
 name = "aiohttp"
-version = "3.13.2"
+version = "3.13.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "aiohappyeyeballs" },
@@ -29,76 +29,76 @@ dependencies = [
     { name = "propcache" },
     { name = "yarl" },
 ]
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 ]
 
 [[package]]
@@ -210,6 +210,7 @@ name = "backend"
 version = "0.1.0"
 source = { virtual = "." }
 dependencies = [
+    { name = "aiohttp" },
     { name = "alembic" },
     { name = "asyncpg" },
     { name = "boto3" },
@@ -226,6 +227,7 @@ dependencies = [
     { name = "langgraph" },
     { name = "marshmallow" },
     { name = "psycopg2-binary" },
+    { name = "pyasn1" },
     { name = "pydantic" },
     { name = "pydantic-settings" },
     { name = "python-dotenv" },
@@ -250,12 +252,13 @@ dev = [
 
 [package.metadata]
 requires-dist = [
+    { name = "aiohttp", specifier = ">=3.13.3" },
     { name = "alembic", specifier = "==1.17.1" },
     { name = "asyncpg", specifier = "==0.30.0" },
     { name = "boto3", specifier = "==1.40.71" },
     { name = "fastapi", specifier = "==0.121.1" },
     { name = "fastmcp", specifier = ">=2.14.1" },
-    { name = "filelock", specifier = ">=3.20.1" },
+    { name = "filelock", specifier = ">=3.20.3" },
     { name = "greenlet", specifier = "==3.2.4" },
     { name = "hiredis", specifier = "==3.3.0" },
     { name = "langchain", specifier = ">=1.0.5" },
@@ -268,6 +271,7 @@ requires-dist = [
     { name = "mypy", marker = "extra == 'dev'", specifier = "==1.18.2" },
     { name = "pip-audit", marker = "extra == 'dev'", specifier = ">=2.7.0" },
     { name = "psycopg2-binary", specifier = "==2.9.11" },
+    { name = "pyasn1", specifier = ">=0.6.2" },
     { name = "pydantic", specifier = "==2.12.4" },
     { name = "pydantic-settings", specifier = "==2.12.0" },
     { name = "pytest", marker = "extra == 'dev'", specifier = ">=9.0.0" },
@@ -279,7 +283,7 @@ requires-dist = [
     { name = "sqlalchemy", specifier = "==2.0.44" },
     { name = "structlog", specifier = ">=25.5.0" },
     { name = "types-redis", marker = "extra == 'dev'", specifier = ">=4.6.0" },
-    { name = "urllib3", specifier = ">=2.6.0" },
+    { name = "urllib3", specifier = ">=2.6.3" },
     { name = "uvicorn", extras = ["standard"], specifier = "==0.38.0" },
     { name = "websockets", specifier = "==15.0.1" },
 ]
@@ -760,11 +764,11 @@ wheels = [
 
 [[package]]
 name = "filelock"
-version = "3.20.1"
+version = "3.20.3"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/a7/23/ce7a1126827cedeb958fc043d61745754464eb56c5937c35bbf2b8e26f34/filelock-3.20.1.tar.gz", hash = "sha256:b8360948b351b80f420878d8516519a2204b07aefcdcfd24912a5d33127f188c", size = 19476, upload-time = "2025-12-15T23:54:28.027Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/1d/65/ce7f1b70157833bf3cb851b556a37d4547ceafc158aa9b34b36782f23696/filelock-3.20.3.tar.gz", hash = "sha256:18c57ee915c7ec61cff0ecf7f0f869936c7c30191bb0cf406f1341778d0834e1", size = 19485, upload-time = "2026-01-09T17:55:05.421Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/b5/36/7fb70f04bf00bc646cd5bb45aa9eddb15e19437a28b8fb2b4a5249fac770/filelock-3.20.3-py3-none-any.whl", hash = "sha256:4b0dda527ee31078689fc205ec4f1c1bf7d56cf88b6dc9426c4f230e46c2dce1", size = 16701, upload-time = "2026-01-09T17:55:04.334Z" },
 ]
 
 [[package]]
@@ -2602,11 +2606,11 @@ wheels = [
 
 [[package]]
 name = "pyasn1"
-version = "0.6.1"
+version = "0.6.2"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/ba/e9/01f1a64245b89f039897cb0130016d79f77d52669aae6ee7b159a6c4c018/pyasn1-0.6.1.tar.gz", hash = "sha256:6f580d2bdd84365380830acf45550f2511469f673cb4a5ae3857a3170128b034", size = 145322, upload-time = "2024-09-10T22:41:42.55Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/fe/b6/6e630dff89739fcd427e3f72b3d905ce0acb85a45d4ec3e2678718a3487f/pyasn1-0.6.2.tar.gz", hash = "sha256:9b59a2b25ba7e4f8197db7686c09fb33e658b98339fadb826e9512629017833b", size = 146586, upload-time = "2026-01-16T18:04:18.534Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/44/b5/a96872e5184f354da9c84ae119971a0a4c221fe9b27a4d94bd43f2596727/pyasn1-0.6.2-py3-none-any.whl", hash = "sha256:1eb26d860996a18e9b6ed05e7aae0e9fc21619fcee6af91cca9bad4fbea224bf", size = 83371, upload-time = "2026-01-16T18:04:17.174Z" },
 ]
 
 [[package]]
@@ -3386,11 +3390,11 @@ wheels = [
 
 [[package]]
 name = "urllib3"
-version = "2.6.2"
+version = "2.6.3"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/1e/24/a2a2ed9addd907787d7aa0355ba36a6cadf1768b934c652ea78acbd59dcd/urllib3-2.6.2.tar.gz", hash = "sha256:016f9c98bb7e98085cb2b4b17b87d2c702975664e4f060c6532e64d1c1a5e797", size = 432930, upload-time = "2025-12-11T15:56:40.252Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/c7/24/5f1b3bdffd70275f6661c76461e25f024d5a38a46f04aaca912426a2b1d3/urllib3-2.6.3.tar.gz", hash = "sha256:1b62b6884944a57dbe321509ab94fd4d3b307075e0c2eae991ac71ee15ad38ed", size = 435556, upload-time = "2026-01-07T16:24:43.925Z" }
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+    { url = "https://files.pythonhosted.org/packages/39/08/aaaad47bc4e9dc8c725e68f9d04865dbcb2052843ff09c97b08904852d84/urllib3-2.6.3-py3-none-any.whl", hash = "sha256:bf272323e553dfb2e87d9bfd225ca7b0f467b919d7bbd355436d3fd37cb0acd4", size = 131584, upload-time = "2026-01-07T16:24:42.685Z" },
 ]
 
 [[package]]
diff --git a/docs/design/0-index.md b/docs/design/0-index.md
index 9062ead..30e5c95 100644
--- a/docs/design/0-index.md
+++ b/docs/design/0-index.md
@@ -6,4 +6,5 @@
 2. [アーキテクチャ](./architecture.md)
 3. [データフロー](./dataflow.md)
 4. [ディレクトリ構造](./directory-structure.md)
-5. [Lambda](./lambda/0-index.md)
+5. [モノレポ設計](./monorepo.md)
+6. [Lambda](./lambda/0-index.md)
diff --git a/docs/design/directory-structure.md b/docs/design/directory-structure.md
index e19414a..04850a2 100644
--- a/docs/design/directory-structure.md
+++ b/docs/design/directory-structure.md
@@ -4,15 +4,27 @@
 
 ```sh
 ai-chatbot-api/
-├── backend/
+├── backend/                   # Python (FastAPI)
 │   ├── app/
 │   └── Dockerfile
-├── frontend/
+├── frontend/                  # TypeScript (React + Vite)
 │   ├── src/
 │   │   ├── App.tsx           # メインコンポーネント
 │   │   └── main.tsx          # エントリーポイント
 │   ├── Dockerfile
 │   └── package.json
+├── flutter/                   # Dart (Flutter)
+│   ├── lib/
+│   │   ├── main.dart         # エントリーポイント
+│   │   ├── models/           # データモデル
+│   │   ├── screens/          # 画面
+│   │   ├── services/         # サービス
+│   │   └── widgets/          # ウィジェット
+│   ├── test/                 # テスト
+│   └── pubspec.yaml          # 依存関係
+├── lambda/                    # Python (AWS CDK + Lambda)
+├── localstack/                # ローカルAWS環境
+├── docs/                      # ドキュメント
 ├── compose.yml               # Docker Compose設定
 └── README.md
 ```
diff --git a/docs/design/monorepo.md b/docs/design/monorepo.md
new file mode 100644
index 0000000..7294f21
--- /dev/null
+++ b/docs/design/monorepo.md
@@ -0,0 +1,155 @@
+# モノレポ設計
+
+## 概要
+
+本プロジェクトでは、複数の技術スタック（Python、TypeScript、Dart）を**モノレポ（Monorepo）** 構成で管理しています。
+
+## リポジトリ構成
+
+```text
+ai-chatbot-api/
+├── backend/          # Python (FastAPI)
+├── frontend/         # TypeScript (React + Vite)
+├── flutter/          # Dart (Flutter)
+├── lambda/           # Python (AWS CDK + Lambda)
+├── localstack/       # Shell (ローカルAWS環境)
+└── docs/             # ドキュメント
+```
+
+## 選定理由
+
+### モノレポを選択した理由
+
+| 観点                     | 判断          | 理由                                       |
+| ------------------------ | ------------- | ------------------------------------------ |
+| **プロジェクトの関連性** | ✅ 高い       | 同一のチャットボットアプリケーションを構成 |
+| **開発チーム**           | ✅ 同一       | 個人開発（学習目的）                       |
+| **リリースサイクル**     | ✅ 統一的     | 同時にデプロイ可能                         |
+| **セキュリティ要件**     | ✅ 同一       | 特別な分離要件なし                         |
+| **リポジトリサイズ**     | ✅ 小〜中規模 | 巨大なバイナリなし                         |
+| **目的**                 | ✅ 学習・実験 | シンプルな構成が望ましい                   |
+
+### 比較検討した選択肢
+
+#### 1. モノレポ（直接追加）✅ 採用
+
+```text
+ai-chatbot-api/
+├── backend/
+├── frontend/
+├── flutter/      # 直接追加
+└── ...
+```
+
+| メリット                     | デメリット                    |
+| ---------------------------- | ----------------------------- |
+| 単一リポジトリで管理が簡単   | リポジトリサイズが増加        |
+| 共通設定・ドキュメントを統一 | 言語ごとのツールが混在        |
+| 関連する変更を1コミットで    | CI/CDの設定が複雑になる可能性 |
+| 学習コストが最小             | -                             |
+
+#### 2. Git Submodule ❌ 不採用
+
+```text
+ai-chatbot-api/
+├── flutter/      # ← 別リポジトリへの参照
+└── .gitmodules
+```
+
+| メリット                 | デメリット                           |
+| ------------------------ | ------------------------------------ |
+| リポジトリの独立性が高い | 操作が複雑（学習コスト高）           |
+| 特定バージョンを固定可能 | `--recursive`を忘れると不完全なclone |
+| 権限を分けられる         | detached HEAD問題が発生しやすい      |
+
+**不採用理由**: 個人開発では複雑さに見合うメリットがない
+
+#### 3. Git Subtree ❌ 不採用
+
+```text
+ai-chatbot-api/
+├── flutter/      # ← コードがコピーされている
+└── (履歴が統合)
+```
+
+| メリット                 | デメリット           |
+| ------------------------ | -------------------- |
+| 通常のcloneでOK          | 双方向同期が面倒     |
+| サブモジュールより直感的 | 履歴が混在する可能性 |
+
+**不採用理由**: 別リポジトリを維持する必要がなく、オーバーヘッド
+
+#### 4. 完全に独立したリポジトリ ❌ 不採用
+
+```text
+github.com/user/ai-chatbot-api
+github.com/user/ai-chatbot-flutter
+```
+
+| メリット       | デメリット         |
+| -------------- | ------------------ |
+| 最もシンプル   | 関連する変更が分散 |
+| 自由に実験可能 | 共通設定の重複     |
+
+**不採用理由**: 同一アプリケーションのため統一管理が望ましい
+
+## モノレポの運用方針
+
+### ディレクトリごとの独立性
+
+各ディレクトリは独立した依存関係管理を持ちます：
+
+| ディレクトリ | 言語       | 依存管理              |
+| ------------ | ---------- | --------------------- |
+| `backend/`   | Python     | `pyproject.toml` (uv) |
+| `frontend/`  | TypeScript | `package.json` (pnpm) |
+| `flutter/`   | Dart       | `pubspec.yaml` (pub)  |
+| `lambda/`    | Python     | `pyproject.toml` (uv) |
+
+### CI/CD の分離
+
+GitHub Actions でパスフィルターを使用し、変更があった部分のみビルド：
+
+```yaml
+# .github/workflows/backend.yml
+on:
+  push:
+    paths:
+      - 'backend/**'
+
+# .github/workflows/flutter.yml
+on:
+  push:
+    paths:
+      - 'flutter/**'
+```
+
+### 開発環境
+
+開発者は必要なプロジェクトのみセットアップ可能：
+
+```bash
+# バックエンドのみ開発
+cd backend && uv sync
+
+# Flutterのみ開発
+cd flutter && flutter pub get
+
+# 全体を起動（Docker Compose）
+make up
+```
+
+## モノレポが適さなくなるケース
+
+以下の状況が発生した場合、リポジトリ分割を検討：
+
+1. **チームの分離**: 異なるチームが独立してリリースする必要がある
+2. **セキュリティ要件**: 機密コードの分離が必要
+3. **リポジトリサイズ**: cloneに数分以上かかるようになった
+4. **ライセンス**: 異なるライセンスのコードが混在
+
+## 参考資料
+
+- [Monorepo vs Polyrepo](https://monorepo.tools/)
+- [Git Submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules)
+- [Git Subtree](https://www.atlassian.com/git/tutorials/git-subtree)
diff --git a/docs/design/tech-stack.md b/docs/design/tech-stack.md
index aa59dbd..7919b24 100644
--- a/docs/design/tech-stack.md
+++ b/docs/design/tech-stack.md
@@ -70,6 +70,36 @@
   - ディスク効率が良い（node_modulesの重複削減）
   - 厳密なパッケージ依存関係管理
 
+## モバイル（Flutter）
+
+### Flutter
+
+- [公式サイト](https://flutter.dev/)
+- 選定理由
+  - 1つのコードベースでiOS、Android、Webアプリを構築可能
+  - 宣言的UIでReactに近い開発体験
+  - ホットリロードによる高速な開発サイクル
+  - Material Design 3対応で美しいUI
+  - Dart言語の学習
+
+### Dart
+
+- [公式サイト](https://dart.dev/)
+- 選定理由
+  - Flutter公式言語
+  - 型安全でモダンな構文
+  - async/awaitによる非同期処理
+  - null safety対応
+
+### Riverpod
+
+- [公式サイト](https://riverpod.dev/)
+- 選定理由
+  - Flutterの状態管理ライブラリ
+  - コンパイル時の安全性
+  - テスタビリティの向上
+  - Providerの進化版として設計
+
 ## MCP (Model Context Protocol)
 
 ### FastMCP
diff --git a/flutter/.gitignore b/flutter/.gitignore
new file mode 100644
index 0000000..bf878a3
--- /dev/null
+++ b/flutter/.gitignore
@@ -0,0 +1,58 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.packages
+.package-config.json
+.flutter-plugins
+.flutter-plugins-dependencies
+.flutter_build/
+flutter_export_environment.sh
+*.dill
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/.gradle/
+/android/app/build/
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+# iOS/macOS
+**/GeneratedPluginRegistrant.*
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Flutter.podspec
+**/ios/Pods/
+**/ios/.symlinks/
+**/macos/Pods/
+**/macos/.symlinks/
+
+# Environment variables
+.env
+
diff --git a/flutter/README.md b/flutter/README.md
new file mode 100644
index 0000000..d4b57a9
--- /dev/null
+++ b/flutter/README.md
@@ -0,0 +1,149 @@
+# AI Chatbot Flutter App
+
+Flutter製のAIチャットボットアプリケーションです。
+
+## 概要
+
+このアプリケーションは、バックエンドのFastAPI + LangChain/LangGraphと連携して、AIチャット機能を提供します。
+
+## 機能
+
+- リアルタイムチャット（WebSocket）
+- ストリーミング応答
+- Markdown表示
+- ダークモード対応
+- クロスプラットフォーム（iOS、Android、Web）
+
+## セットアップ
+
+### 前提条件
+
+- Flutter SDK 3.0.0以上
+- Dart SDK 3.0.0以上
+
+### インストール
+
+```bash
+# 依存関係のインストール
+flutter pub get
+
+# 環境変数の設定
+cp env.example .env
+# .env を編集してAPIのURLを設定
+```
+
+### 開発
+
+```bash
+# iOS
+flutter run -d ios
+
+# Android
+flutter run -d android
+
+# Web
+flutter run -d chrome
+
+# すべてのデバイスを確認
+flutter devices
+```
+
+### ビルド
+
+```bash
+# iOS
+flutter build ios
+
+# Android
+flutter build apk
+flutter build appbundle
+
+# Web
+flutter build web
+```
+
+## プロジェクト構成
+
+```text
+flutter/
+├── lib/
+│   ├── main.dart           # エントリーポイント
+│   ├── models/             # データモデル
+│   │   ├── message.dart
+│   │   └── session.dart
+│   ├── screens/            # 画面
+│   │   └── chat_screen.dart
+│   ├── services/           # サービス
+│   │   ├── api_service.dart
+│   │   └── websocket_service.dart
+│   └── widgets/            # ウィジェット
+│       ├── chat_input.dart
+│       └── message_bubble.dart
+├── test/                   # テスト
+├── assets/                 # アセット
+├── pubspec.yaml            # 依存関係
+└── analysis_options.yaml   # Linter設定
+```
+
+## 技術スタック
+
+| 項目           | 技術                  |
+| -------------- | --------------------- |
+| フレームワーク | Flutter 3.x           |
+| 言語           | Dart 3.x              |
+| 状態管理       | Riverpod              |
+| HTTP           | http パッケージ       |
+| WebSocket      | web_socket_channel    |
+| Markdown       | flutter_markdown_plus |
+
+## バックエンドとの連携
+
+このアプリはバックエンドAPI（FastAPI）と以下のエンドポイントで連携します：
+
+| エンドポイント                 | 説明              |
+| ------------------------------ | ----------------- |
+| `POST /api/chat/sessions`      | セッション作成    |
+| `GET /api/chat/sessions/{id}`  | セッション取得    |
+| `WS /api/chat/ws/{session_id}` | WebSocketチャット |
+
+## 環境変数
+
+| 変数           | 説明                 | デフォルト              |
+| -------------- | -------------------- | ----------------------- |
+| `API_BASE_URL` | APIのベースURL       | `http://localhost:8000` |
+| `WS_BASE_URL`  | WebSocketのベースURL | `ws://localhost:8000`   |
+
+## 開発ガイドライン
+
+### コード規約
+
+- `analysis_options.yaml`のlintルールに従う
+- `flutter analyze`でエラーがないことを確認
+
+### テスト
+
+```bash
+# ユニットテスト
+flutter test
+
+# 特定のテスト
+flutter test test/models/message_test.dart
+```
+
+## トラブルシューティング
+
+### WebSocket接続エラー
+
+1. バックエンドが起動していることを確認
+2. `.env`のURLが正しいことを確認
+3. CORS設定を確認
+
+### iOSシミュレーターでの接続
+
+`localhost`ではなく`127.0.0.1`を使用するか、実際のIPアドレスを設定してください。
+
+## 参考
+
+- [Flutter公式ドキュメント](https://flutter.dev/docs)
+- [Riverpod](https://riverpod.dev/)
+- [バックエンドAPI](../backend/README.md)
diff --git a/flutter/analysis_options.yaml b/flutter/analysis_options.yaml
new file mode 100644
index 0000000..c77a16a
--- /dev/null
+++ b/flutter/analysis_options.yaml
@@ -0,0 +1,42 @@
+# This file configures the analyzer for Dart code.
+
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  rules:
+    # Error prevention
+    avoid_print: true
+    avoid_empty_else: true
+    avoid_returning_null_for_future: true
+    avoid_slow_async_io: true
+    cancel_subscriptions: true
+    close_sinks: true
+    prefer_void_to_null: true
+
+    # Style
+    always_declare_return_types: true
+    always_put_required_named_parameters_first: true
+    always_use_package_imports: true
+    avoid_redundant_argument_values: true
+    prefer_const_constructors: true
+    prefer_const_declarations: true
+    prefer_final_fields: true
+    prefer_final_locals: true
+    prefer_single_quotes: true
+    sort_constructors_first: true
+    sort_unnamed_constructors_first: true
+    use_super_parameters: true
+
+    # Documentation
+    public_member_api_docs: false
+
+analyzer:
+  exclude:
+    - "**/*.g.dart"
+    - "**/*.freezed.dart"
+  errors:
+    invalid_annotation_target: ignore
+
+
+
+
diff --git a/flutter/env.example b/flutter/env.example
new file mode 100644
index 0000000..04c431b
--- /dev/null
+++ b/flutter/env.example
@@ -0,0 +1,3 @@
+# API Configuration
+API_BASE_URL=http://localhost:8000
+WS_BASE_URL=ws://localhost:8000
diff --git a/flutter/lib/config/app_config.dart b/flutter/lib/config/app_config.dart
new file mode 100644
index 0000000..eab040c
--- /dev/null
+++ b/flutter/lib/config/app_config.dart
@@ -0,0 +1,19 @@
+/// アプリ設定（ビルド時注入）
+///
+/// `--dart-define` で環境ごとの値を注入します。
+/// 例:
+/// - API_BASE_URL: `http://localhost:8000`
+/// - WS_BASE_URL: `ws://localhost:8000`
+class AppConfig {
+  static const String _apiBaseUrlFromEnv =
+      String.fromEnvironment('API_BASE_URL', defaultValue: '');
+  static const String _wsBaseUrlFromEnv =
+      String.fromEnvironment('WS_BASE_URL', defaultValue: '');
+
+  static String get apiBaseUrl =>
+      _apiBaseUrlFromEnv.isNotEmpty ? _apiBaseUrlFromEnv : 'http://localhost:8000';
+
+  static String get wsBaseUrl =>
+      _wsBaseUrlFromEnv.isNotEmpty ? _wsBaseUrlFromEnv : 'ws://localhost:8000';
+}
+
diff --git a/flutter/lib/main.dart b/flutter/lib/main.dart
new file mode 100644
index 0000000..d816cf5
--- /dev/null
+++ b/flutter/lib/main.dart
@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'package:ai_chatbot/screens/chat_screen.dart';
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  runApp(
+    const ProviderScope(
+      child: AIChatbotApp(),
+    ),
+  );
+}
+
+class AIChatbotApp extends StatelessWidget {
+  const AIChatbotApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'AI Chatbot',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: Colors.blue,
+          brightness: Brightness.light,
+        ),
+        useMaterial3: true,
+        appBarTheme: const AppBarTheme(
+          centerTitle: true,
+          elevation: 0,
+        ),
+      ),
+      darkTheme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: Colors.blue,
+          brightness: Brightness.dark,
+        ),
+        useMaterial3: true,
+        appBarTheme: const AppBarTheme(
+          centerTitle: true,
+          elevation: 0,
+        ),
+      ),
+      themeMode: ThemeMode.system,
+      home: const ChatScreen(),
+    );
+  }
+}
+
+
+
+
diff --git a/flutter/lib/models/message.dart b/flutter/lib/models/message.dart
new file mode 100644
index 0000000..a7a90d2
--- /dev/null
+++ b/flutter/lib/models/message.dart
@@ -0,0 +1,62 @@
+/// チャットメッセージモデル
+class Message {
+  final String id;
+  final String content;
+  final MessageRole role;
+  final DateTime timestamp;
+  final bool isStreaming;
+
+  const Message({
+    required this.id,
+    required this.content,
+    required this.role,
+    required this.timestamp,
+    this.isStreaming = false,
+  });
+
+  Message copyWith({
+    String? id,
+    String? content,
+    MessageRole? role,
+    DateTime? timestamp,
+    bool? isStreaming,
+  }) {
+    return Message(
+      id: id ?? this.id,
+      content: content ?? this.content,
+      role: role ?? this.role,
+      timestamp: timestamp ?? this.timestamp,
+      isStreaming: isStreaming ?? this.isStreaming,
+    );
+  }
+
+  factory Message.fromJson(Map<String, dynamic> json) {
+    return Message(
+      id: json['id'] as String? ?? '',
+      content: json['content'] as String? ?? json['message'] as String? ?? '',
+      role: json['role'] == 'assistant' ? MessageRole.assistant : MessageRole.user,
+      timestamp: json['timestamp'] != null
+          ? DateTime.parse(json['timestamp'] as String)
+          : DateTime.now(),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'content': content,
+      'role': role.name,
+      'timestamp': timestamp.toIso8601String(),
+    };
+  }
+}
+
+/// メッセージの役割
+enum MessageRole {
+  user,
+  assistant,
+}
+
+
+
+
diff --git a/flutter/lib/models/session.dart b/flutter/lib/models/session.dart
new file mode 100644
index 0000000..e85daa3
--- /dev/null
+++ b/flutter/lib/models/session.dart
@@ -0,0 +1,40 @@
+/// チャットセッションモデル
+class ChatSession {
+  final String sessionId;
+  final String userId;
+  final String status;
+  final DateTime? createdAt;
+  final Map<String, dynamic>? metadata;
+
+  const ChatSession({
+    required this.sessionId,
+    required this.userId,
+    required this.status,
+    this.createdAt,
+    this.metadata,
+  });
+
+  factory ChatSession.fromJson(Map<String, dynamic> json) {
+    return ChatSession(
+      sessionId: json['session_id']?.toString() ?? '',
+      userId: json['user_id'] as String? ?? '',
+      status: json['status'] as String? ?? 'active',
+      createdAt: json['created_at'] is String
+          ? DateTime.tryParse(json['created_at'] as String)
+          : null,
+      metadata: json['metadata'] as Map<String, dynamic>?,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'session_id': sessionId,
+      'user_id': userId,
+      'status': status,
+      'created_at': createdAt?.toIso8601String(),
+      'metadata': metadata,
+    };
+  }
+
+  bool get isActive => status == 'active';
+}
diff --git a/flutter/lib/screens/chat_screen.dart b/flutter/lib/screens/chat_screen.dart
new file mode 100644
index 0000000..328bc4e
--- /dev/null
+++ b/flutter/lib/screens/chat_screen.dart
@@ -0,0 +1,308 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'dart:async';
+
+import 'package:ai_chatbot/models/message.dart';
+import 'package:ai_chatbot/services/api_service.dart';
+import 'package:ai_chatbot/services/websocket_service.dart';
+import 'package:ai_chatbot/widgets/chat_input.dart';
+import 'package:ai_chatbot/widgets/message_bubble.dart';
+
+/// チャット画面
+class ChatScreen extends ConsumerStatefulWidget {
+  const ChatScreen({super.key});
+
+  @override
+  ConsumerState<ChatScreen> createState() => _ChatScreenState();
+}
+
+class _ChatScreenState extends ConsumerState<ChatScreen> {
+  final List<Message> _messages = [];
+  final ScrollController _scrollController = ScrollController();
+  final ApiService _apiService = ApiService();
+  final WebSocketService _wsService = WebSocketService();
+  StreamSubscription<WebSocketMessage>? _wsSubscription;
+
+  String? _sessionId;
+  bool _isLoading = true;
+  bool _isStreaming = false;
+  String? _error;
+  String _streamingContent = '';
+
+  @override
+  void initState() {
+    super.initState();
+    _initialize();
+  }
+
+  Future<void> _initialize() async {
+    try {
+      // セッション作成
+      final session = await _apiService.createSession();
+      _sessionId = session.sessionId;
+
+      // WebSocket接続
+      await _wsService.connect(_sessionId!);
+
+      // メッセージストリームを購読
+      _wsSubscription?.cancel();
+      _wsSubscription = _wsService.messageStream.listen(
+        _handleWebSocketMessage,
+        onError: (e) {
+          if (!mounted) return;
+          setState(() {
+            _error = '通信エラーが発生しました: $e';
+            _isStreaming = false;
+            _streamingContent = '';
+          });
+          _showSnackBar(_error!);
+        },
+      );
+
+      setState(() {
+        _isLoading = false;
+        _error = null;
+      });
+    } catch (e) {
+      setState(() {
+        _isLoading = false;
+        _error = 'セッション作成に失敗しました: $e';
+      });
+    }
+  }
+
+  void _showSnackBar(String message) {
+    if (!mounted) return;
+    final messenger = ScaffoldMessenger.of(context);
+    messenger.removeCurrentSnackBar();
+    messenger.showSnackBar(
+      SnackBar(content: Text(message)),
+    );
+  }
+
+  void _handleWebSocketMessage(WebSocketMessage message) {
+    switch (message.type) {
+      case WebSocketMessageType.stream:
+        setState(() {
+          _streamingContent += message.content ?? '';
+          _isStreaming = true;
+        });
+        _scrollToBottom();
+        break;
+      case WebSocketMessageType.complete:
+        setState(() {
+          if (_streamingContent.isNotEmpty) {
+            _messages.add(Message(
+              id: DateTime.now().millisecondsSinceEpoch.toString(),
+              content: _streamingContent,
+              role: MessageRole.assistant,
+              timestamp: DateTime.now(),
+            ));
+          }
+          _streamingContent = '';
+          _isStreaming = false;
+        });
+        _scrollToBottom();
+        break;
+      case WebSocketMessageType.error:
+        setState(() {
+          _error = message.error;
+          _isStreaming = false;
+          _streamingContent = '';
+        });
+        if (_error != null && _error!.isNotEmpty) {
+          _showSnackBar(_error!);
+        }
+        break;
+      case WebSocketMessageType.disconnected:
+        setState(() {
+          _error = '接続が切断されました';
+        });
+        _showSnackBar(_error!);
+        break;
+      default:
+        break;
+    }
+  }
+
+  void _sendMessage(String content) {
+    if (content.trim().isEmpty) return;
+
+    // ユーザーメッセージを追加
+    setState(() {
+      _messages.add(Message(
+        id: DateTime.now().millisecondsSinceEpoch.toString(),
+        content: content,
+        role: MessageRole.user,
+        timestamp: DateTime.now(),
+      ));
+      _streamingContent = '';
+    });
+
+    // WebSocketでメッセージ送信
+    _wsService.sendMessage(content);
+    _scrollToBottom();
+  }
+
+  void _scrollToBottom() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (_scrollController.hasClients) {
+        _scrollController.animateTo(
+          _scrollController.position.maxScrollExtent,
+          duration: const Duration(milliseconds: 300),
+          curve: Curves.easeOut,
+        );
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _scrollController.dispose();
+    _wsSubscription?.cancel();
+    _wsService.dispose();
+    _apiService.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('AI Chatbot'),
+        actions: [
+          if (_sessionId != null)
+            IconButton(
+              icon: const Icon(Icons.refresh),
+              onPressed: () {
+                setState(() {
+                  _messages.clear();
+                  _error = null;
+                });
+              },
+              tooltip: '会話をクリア',
+            ),
+        ],
+      ),
+      body: _buildBody(),
+    );
+  }
+
+  Widget _buildBody() {
+    if (_isLoading) {
+      return const Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            CircularProgressIndicator(),
+            SizedBox(height: 16),
+            Text('セッションを作成中...'),
+          ],
+        ),
+      );
+    }
+
+    if (_error != null && _sessionId == null) {
+      return Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            const Icon(
+              Icons.error_outline,
+              size: 64,
+              color: Colors.red,
+            ),
+            const SizedBox(height: 16),
+            Text(
+              _error!,
+              textAlign: TextAlign.center,
+              style: const TextStyle(color: Colors.red),
+            ),
+            const SizedBox(height: 16),
+            ElevatedButton(
+              onPressed: () {
+                setState(() {
+                  _isLoading = true;
+                  _error = null;
+                });
+                _initialize();
+              },
+              child: const Text('再試行'),
+            ),
+          ],
+        ),
+      );
+    }
+
+    return Column(
+      children: [
+        // メッセージリスト
+        Expanded(
+          child: _messages.isEmpty && !_isStreaming
+              ? _buildEmptyState()
+              : _buildMessageList(),
+        ),
+        // 入力エリア
+        ChatInput(
+          onSend: _sendMessage,
+          enabled: !_isStreaming,
+        ),
+      ],
+    );
+  }
+
+  Widget _buildEmptyState() {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(
+            Icons.chat_bubble_outline,
+            size: 64,
+            color: Theme.of(context)
+                .colorScheme
+                .primary
+                .withValues(alpha: 0.5),
+          ),
+          const SizedBox(height: 16),
+          Text(
+            'メッセージを入力してください',
+            style: TextStyle(
+              color: Theme.of(context)
+                  .colorScheme
+                  .onSurface
+                  .withValues(alpha: 0.6),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildMessageList() {
+    return ListView.builder(
+      controller: _scrollController,
+      padding: const EdgeInsets.all(16),
+      itemCount: _messages.length + (_isStreaming ? 1 : 0),
+      itemBuilder: (context, index) {
+        if (index == _messages.length && _isStreaming) {
+          // ストリーミング中のメッセージ
+          return MessageBubble(
+            message: Message(
+              id: 'streaming',
+              content: _streamingContent,
+              role: MessageRole.assistant,
+              timestamp: DateTime.now(),
+              isStreaming: true,
+            ),
+          );
+        }
+        return MessageBubble(message: _messages[index]);
+      },
+    );
+  }
+}
+
+
+
+
diff --git a/flutter/lib/services/api_service.dart b/flutter/lib/services/api_service.dart
new file mode 100644
index 0000000..2705ac9
--- /dev/null
+++ b/flutter/lib/services/api_service.dart
@@ -0,0 +1,124 @@
+import 'dart:convert';
+
+import 'package:http/http.dart' as http;
+
+import 'package:ai_chatbot/config/app_config.dart';
+import 'package:ai_chatbot/models/session.dart';
+
+/// APIサービス
+class ApiService {
+  static const Duration _timeout = Duration(seconds: 30);
+  static const ApiException _timeoutException = ApiException(
+    statusCode: 408,
+    message: 'リクエストがタイムアウトしました',
+  );
+
+  final String baseUrl;
+  final http.Client _client;
+
+  ApiService({
+    String? baseUrl,
+    http.Client? client,
+  })  : baseUrl = baseUrl ?? AppConfig.apiBaseUrl,
+        _client = client ?? http.Client();
+
+  /// セッションを作成
+  Future<ChatSession> createSession({Map<String, dynamic>? metadata}) async {
+    final response = await _client.post(
+      Uri.parse('$baseUrl/api/chat/sessions'),
+      headers: {'Content-Type': 'application/json'},
+      body: jsonEncode({
+        'metadata': metadata ?? {'language': 'ja'},
+      }),
+    ).timeout(
+      _timeout,
+      onTimeout: () => throw _timeoutException,
+    );
+
+    if (response.statusCode != 200 && response.statusCode != 201) {
+      throw ApiException(
+        statusCode: response.statusCode,
+        message: 'セッション作成に失敗しました',
+      );
+    }
+
+    final data = jsonDecode(response.body) as Map<String, dynamic>;
+    return ChatSession.fromJson(data);
+  }
+
+  /// セッション情報を取得
+  Future<ChatSession?> getSession(String sessionId) async {
+    final response = await _client.get(
+      Uri.parse('$baseUrl/api/chat/sessions/$sessionId'),
+    ).timeout(
+      _timeout,
+      onTimeout: () => throw _timeoutException,
+    );
+
+    if (response.statusCode == 404) {
+      return null;
+    }
+
+    if (response.statusCode != 200) {
+      throw ApiException(
+        statusCode: response.statusCode,
+        message: 'セッション取得に失敗しました',
+      );
+    }
+
+    final data = jsonDecode(response.body) as Map<String, dynamic>;
+    return ChatSession.fromJson(data);
+  }
+
+  /// 会話履歴を取得
+  Future<List<Map<String, dynamic>>> getConversationHistory(
+    String sessionId,
+  ) async {
+    final response = await _client.get(
+      Uri.parse('$baseUrl/api/chat/sessions/$sessionId/messages'),
+    ).timeout(
+      _timeout,
+      onTimeout: () => throw _timeoutException,
+    );
+
+    if (response.statusCode != 200) {
+      throw ApiException(
+        statusCode: response.statusCode,
+        message: '会話履歴の取得に失敗しました',
+      );
+    }
+
+    final data = jsonDecode(response.body) as List<dynamic>;
+    return data.cast<Map<String, dynamic>>();
+  }
+
+  /// ヘルスチェック
+  Future<bool> healthCheck() async {
+    try {
+      final response = await _client.get(
+        Uri.parse('$baseUrl/api/health'),
+      ).timeout(_timeout);
+      return response.statusCode == 200;
+    } catch (e) {
+      return false;
+    }
+  }
+
+  void dispose() {
+    _client.close();
+  }
+}
+
+/// API例外
+class ApiException implements Exception {
+  final int statusCode;
+  final String message;
+
+  const ApiException({
+    required this.statusCode,
+    required this.message,
+  });
+
+  @override
+  String toString() => 'ApiException($statusCode): $message';
+}
diff --git a/flutter/lib/services/websocket_service.dart b/flutter/lib/services/websocket_service.dart
new file mode 100644
index 0000000..8695338
--- /dev/null
+++ b/flutter/lib/services/websocket_service.dart
@@ -0,0 +1,190 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:web_socket_channel/web_socket_channel.dart';
+
+import 'package:ai_chatbot/config/app_config.dart';
+
+/// WebSocketサービス
+class WebSocketService {
+  final String baseUrl;
+  WebSocketChannel? _channel;
+  StreamSubscription<dynamic>? _channelSubscription;
+  final StreamController<WebSocketMessage> _messageController =
+      StreamController<WebSocketMessage>.broadcast();
+  bool _isConnected = false;
+  bool _isDisposed = false;
+
+  WebSocketService({String? baseUrl})
+      : baseUrl = baseUrl ?? AppConfig.wsBaseUrl;
+
+  /// メッセージストリーム
+  Stream<WebSocketMessage> get messageStream => _messageController.stream;
+
+  /// 接続状態
+  bool get isConnected => _isConnected;
+
+  void _safeAdd(WebSocketMessage message) {
+    if (_isDisposed) return;
+    if (_messageController.isClosed) return;
+    try {
+      _messageController.add(message);
+    } on StateError {
+      // dispose競合等で controller が閉じられている場合は無視
+    }
+  }
+
+  /// WebSocket接続
+  Future<void> connect(String sessionId) async {
+    if (_isDisposed) {
+      throw StateError('WebSocketService は dispose 済みです');
+    }
+
+    if (_isConnected) {
+      await disconnect();
+    }
+
+    final uri = Uri.parse('$baseUrl/api/chat/ws/$sessionId');
+
+    try {
+      _channel = WebSocketChannel.connect(uri);
+      _isConnected = true;
+
+      _channelSubscription = _channel!.stream.listen(
+        (dynamic data) {
+          _handleMessage(data);
+        },
+        onError: (dynamic error) {
+          _isConnected = false;
+          _safeAdd(WebSocketMessage.error(error.toString()));
+        },
+        onDone: () {
+          _isConnected = false;
+          _safeAdd(const WebSocketMessage.disconnected());
+        },
+      );
+
+      _safeAdd(const WebSocketMessage.connected());
+    } catch (e) {
+      _isConnected = false;
+      _safeAdd(WebSocketMessage.error(e.toString()));
+      rethrow;
+    }
+  }
+
+  /// メッセージ処理
+  void _handleMessage(dynamic data) {
+    try {
+      if (data is String) {
+        final json = jsonDecode(data) as Map<String, dynamic>;
+        final type = json['type'] as String?;
+
+        switch (type) {
+          case 'stream':
+            final content = json['content'] as String? ?? '';
+            _safeAdd(WebSocketMessage.stream(content));
+            break;
+          case 'complete':
+            final content = json['content'] as String? ?? '';
+            _safeAdd(WebSocketMessage.complete(content));
+            break;
+          case 'error':
+            final error = json['error'] as String? ?? 'Unknown error';
+            _safeAdd(WebSocketMessage.error(error));
+            break;
+          default:
+            _safeAdd(WebSocketMessage.unknown(data.toString()));
+            break;
+        }
+      }
+    } catch (e) {
+      _safeAdd(WebSocketMessage.error('メッセージ解析エラー: $e'));
+    }
+  }
+
+  /// メッセージ送信
+  void sendMessage(String message) {
+    if (!_isConnected || _channel == null) {
+      throw StateError('WebSocketが接続されていません');
+    }
+
+    final payload = jsonEncode({
+      'type': 'message',
+      'content': message,
+    });
+
+    _channel!.sink.add(payload);
+  }
+
+  /// 切断
+  Future<void> disconnect() async {
+    _isConnected = false;
+    final subscription = _channelSubscription;
+    _channelSubscription = null;
+    await subscription?.cancel();
+    await _channel?.sink.close();
+    _channel = null;
+  }
+
+  /// リソース解放
+  void dispose() {
+    if (_isDisposed) return;
+    _isDisposed = true;
+    _isConnected = false;
+
+    // disconnect() は async のため await できないが、
+    // controller を先に close すると onDone/onError から add されうる。
+    // disconnect 完了後に close することで "Cannot add event after closing" を防ぐ。
+    unawaited(
+      disconnect().whenComplete(() async {
+        if (_messageController.isClosed) return;
+        await _messageController.close();
+      }),
+    );
+  }
+}
+
+/// WebSocketメッセージ
+class WebSocketMessage {
+  final WebSocketMessageType type;
+  final String? content;
+  final String? error;
+
+  const WebSocketMessage._({
+    required this.type,
+    this.content,
+    this.error,
+  });
+
+  const WebSocketMessage.connected()
+      : this._(type: WebSocketMessageType.connected);
+
+  const WebSocketMessage.disconnected()
+      : this._(type: WebSocketMessageType.disconnected);
+
+  const WebSocketMessage.stream(String content)
+      : this._(type: WebSocketMessageType.stream, content: content);
+
+  const WebSocketMessage.complete(String content)
+      : this._(type: WebSocketMessageType.complete, content: content);
+
+  const WebSocketMessage.error(String error)
+      : this._(type: WebSocketMessageType.error, error: error);
+
+  const WebSocketMessage.unknown(String content)
+      : this._(type: WebSocketMessageType.unknown, content: content);
+}
+
+/// WebSocketメッセージタイプ
+enum WebSocketMessageType {
+  connected,
+  disconnected,
+  stream,
+  complete,
+  error,
+  unknown,
+}
+
+
+
+
diff --git a/flutter/lib/widgets/chat_input.dart b/flutter/lib/widgets/chat_input.dart
new file mode 100644
index 0000000..c0b31e5
--- /dev/null
+++ b/flutter/lib/widgets/chat_input.dart
@@ -0,0 +1,98 @@
+import 'package:flutter/material.dart';
+
+/// チャット入力ウィジェット
+class ChatInput extends StatefulWidget {
+  final void Function(String) onSend;
+  final bool enabled;
+
+  const ChatInput({
+    super.key,
+    required this.onSend,
+    this.enabled = true,
+  });
+
+  @override
+  State<ChatInput> createState() => _ChatInputState();
+}
+
+class _ChatInputState extends State<ChatInput> {
+  final TextEditingController _controller = TextEditingController();
+  final FocusNode _focusNode = FocusNode();
+
+  void _handleSend() {
+    final text = _controller.text.trim();
+    if (text.isEmpty) return;
+
+    widget.onSend(text);
+    _controller.clear();
+    _focusNode.requestFocus();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    _focusNode.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Container(
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: colorScheme.surface,
+        border: Border(
+          top: BorderSide(
+            color: colorScheme.outlineVariant,
+          ),
+        ),
+      ),
+      child: SafeArea(
+        child: Row(
+          children: [
+            // テキスト入力
+            Expanded(
+              child: TextField(
+                controller: _controller,
+                focusNode: _focusNode,
+                enabled: widget.enabled,
+                maxLines: 4,
+                minLines: 1,
+                textInputAction: TextInputAction.send,
+                onSubmitted: (_) => _handleSend(),
+                decoration: InputDecoration(
+                  hintText: widget.enabled
+                      ? 'メッセージを入力...'
+                      : 'AIが応答中...',
+                  border: OutlineInputBorder(
+                    borderRadius: BorderRadius.circular(24),
+                    borderSide: BorderSide.none,
+                  ),
+                  filled: true,
+                  fillColor: colorScheme.surfaceContainerHighest,
+                  contentPadding: const EdgeInsets.symmetric(
+                    horizontal: 20,
+                    vertical: 12,
+                  ),
+                ),
+              ),
+            ),
+            const SizedBox(width: 8),
+            // 送信ボタン
+            IconButton.filled(
+              onPressed: widget.enabled ? _handleSend : null,
+              icon: const Icon(Icons.send),
+              tooltip: '送信',
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+
+
+
diff --git a/flutter/lib/widgets/message_bubble.dart b/flutter/lib/widgets/message_bubble.dart
new file mode 100644
index 0000000..c207a1e
--- /dev/null
+++ b/flutter/lib/widgets/message_bubble.dart
@@ -0,0 +1,117 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
+import 'package:intl/intl.dart';
+
+import 'package:ai_chatbot/models/message.dart';
+
+/// メッセージバブルウィジェット
+class MessageBubble extends StatelessWidget {
+  final Message message;
+
+  const MessageBubble({
+    super.key,
+    required this.message,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final isUser = message.role == MessageRole.user;
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Align(
+      alignment: isUser ? Alignment.centerRight : Alignment.centerLeft,
+      child: Container(
+        constraints: BoxConstraints(
+          maxWidth: MediaQuery.of(context).size.width * 0.8,
+        ),
+        margin: const EdgeInsets.symmetric(vertical: 4),
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+        decoration: BoxDecoration(
+          color: isUser
+              ? colorScheme.primaryContainer
+              : colorScheme.surfaceContainerHighest,
+          borderRadius: BorderRadius.only(
+            topLeft: const Radius.circular(16),
+            topRight: const Radius.circular(16),
+            bottomLeft: Radius.circular(isUser ? 16 : 4),
+            bottomRight: Radius.circular(isUser ? 4 : 16),
+          ),
+        ),
+        child: Column(
+          crossAxisAlignment:
+              isUser ? CrossAxisAlignment.end : CrossAxisAlignment.start,
+          children: [
+            // メッセージ内容
+            if (isUser)
+              Text(
+                message.content,
+                style: TextStyle(
+                  color: colorScheme.onPrimaryContainer,
+                ),
+              )
+            else
+              MarkdownBody(
+                data: message.content,
+                styleSheet: MarkdownStyleSheet(
+                  p: TextStyle(
+                    color: colorScheme.onSurface,
+                  ),
+                  code: TextStyle(
+                    backgroundColor: colorScheme.surfaceContainerHighest,
+                    color: colorScheme.onSurface,
+                  ),
+                  codeblockDecoration: BoxDecoration(
+                    color: colorScheme.surfaceContainerHighest,
+                    borderRadius: BorderRadius.circular(8),
+                  ),
+                ),
+                selectable: true,
+              ),
+            // ストリーミングインジケーター
+            if (message.isStreaming) ...[
+              const SizedBox(height: 8),
+              Row(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  SizedBox(
+                    width: 12,
+                    height: 12,
+                    child: CircularProgressIndicator(
+                      strokeWidth: 2,
+                      color: colorScheme.primary,
+                    ),
+                  ),
+                  const SizedBox(width: 8),
+                  Text(
+                    '入力中...',
+                    style: TextStyle(
+                      fontSize: 12,
+                      color: colorScheme.onSurface.withValues(alpha: 0.6),
+                    ),
+                  ),
+                ],
+              ),
+            ],
+            // タイムスタンプ
+            if (!message.isStreaming) ...[
+              const SizedBox(height: 4),
+              Text(
+                DateFormat('HH:mm').format(message.timestamp),
+                style: TextStyle(
+                  fontSize: 10,
+                  color: isUser
+                      ? colorScheme.onPrimaryContainer.withValues(alpha: 0.6)
+                      : colorScheme.onSurface.withValues(alpha: 0.6),
+                ),
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+
+
+
diff --git a/flutter/pubspec.lock b/flutter/pubspec.lock
new file mode 100644
index 0000000..160bd2a
--- /dev/null
+++ b/flutter/pubspec.lock
@@ -0,0 +1,842 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: c209688d9f5a5f26b2fb47a188131a6fb9e876ae9e47af3737c0b4f58a93470d
+      url: "https://pub.dev"
+    source: hosted
+    version: "91.0.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: f51c8499b35f9b26820cfe914828a6a98a94efd5cc78b37bb7d03debae3a1d08
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.4.1"
+  analyzer_buffer:
+    dependency: transitive
+    description:
+      name: analyzer_buffer
+      sha256: aba2f75e63b3135fd1efaa8b6abefe1aa6e41b6bd9806221620fa48f98156033
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.11"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: d0481093c50b1da8910eb0bb301626d4d8eb7284aa739614d2b394ee09e3ea04
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.7.0"
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.13.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  build:
+    dependency: transitive
+    description:
+      name: build
+      sha256: c1668065e9ba04752570ad7e038288559d1e2ca5c6d0131c0f5f55e39e777413
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.3"
+  build_config:
+    dependency: transitive
+    description:
+      name: build_config
+      sha256: "4f64382b97504dc2fcdf487d5aae33418e08b4703fc21249e4db6d804a4d0187"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  build_daemon:
+    dependency: transitive
+    description:
+      name: build_daemon
+      sha256: bf05f6e12cfea92d3c09308d7bcdab1906cd8a179b023269eed00c071004b957
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.1"
+  build_runner:
+    dependency: "direct dev"
+    description:
+      name: build_runner
+      sha256: "110c56ef29b5eb367b4d17fc79375fa8c18a6cd7acd92c05bb3986c17a079057"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.10.4"
+  built_collection:
+    dependency: transitive
+    description:
+      name: built_collection
+      sha256: "376e3dd27b51ea877c28d525560790aee2e6fbb5f20e2f85d5081027d94e2100"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.1.1"
+  built_value:
+    dependency: transitive
+    description:
+      name: built_value
+      sha256: "426cf75afdb23aa74bd4e471704de3f9393f3c7b04c1e2d9c6f1073ae0b8b139"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.12.1"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  checked_yaml:
+    dependency: transitive
+    description:
+      name: checked_yaml
+      sha256: "959525d3162f249993882720d52b7e0c833978df229be20702b33d48d91de70f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.4"
+  cli_config:
+    dependency: transitive
+    description:
+      name: cli_config
+      sha256: ac20a183a07002b700f0c25e61b7ee46b23c309d76ab7b7640a028f18e4d99ec
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.0"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  code_builder:
+    dependency: transitive
+    description:
+      name: code_builder
+      sha256: "11654819532ba94c34de52ff5feb52bd81cba1de00ef2ed622fd50295f9d4243"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.11.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.19.1"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      sha256: "5da775aa218eaf2151c721b16c01c7676fbfdd99cebba2bf64e8b807a28ff94d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.15.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: c8ea0233063ba03258fbcf2ca4d6dadfefe14f02fab57702265467a19f27fadf
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.7"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      sha256: ba631d1c7f7bef6b729a622b7b752645a2d076dba9976925b8f25725a30e1ee6
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.8"
+  dart_style:
+    dependency: transitive
+    description:
+      name: dart_style
+      sha256: a9c30492da18ff84efe2422ba2d319a89942d93e58eb0b73d32abe822ef54b7b
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.3"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "5368f224a74523e8d2e7399ea1638b37aecfca824a3cc4dfdf77bf1fa905ac44"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.3"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      sha256: "289279317b4b16eb2bb7e271abccd4bf84ec9bdcbe999e278a94b804f5630418"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.1"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_dotenv:
+    dependency: "direct main"
+    description:
+      name: flutter_dotenv
+      sha256: d4130c4a43e0b13fefc593bc3961f2cb46e30cb79e253d4a526b1b5d24ae1ce4
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: "3105dc8492f6183fb076ccf1f351ac3d60564bff92e20bfc4af9cc1651f4e7e1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
+  flutter_markdown_plus:
+    dependency: "direct main"
+    description:
+      name: flutter_markdown_plus
+      sha256: "039177906850278e8fb1cd364115ee0a46281135932fa8ecea8455522166d2de"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.7"
+  flutter_riverpod:
+    dependency: "direct main"
+    description:
+      name: flutter_riverpod
+      sha256: "38ec6c303e2c83ee84512f5fc2a82ae311531021938e63d7137eccc107bf3c02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  freezed_annotation:
+    dependency: transitive
+    description:
+      name: freezed_annotation
+      sha256: "7294967ff0a6d98638e7acb774aac3af2550777accd8149c90af5b014e6d44d8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: f64a0333a82f30b0cca061bc3d143813a486dc086b574bfb233b7c1372427694
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: c3f1ee72c96f8f78935e18aa8cecced9ab132419e8625dc187e1c2408efc20de
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.3"
+  graphs:
+    dependency: transitive
+    description:
+      name: graphs
+      sha256: "741bbf84165310a68ff28fe9e727332eef1407342fca52759cb21ad8177bb8d0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.2"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      sha256: "87721a4a50b19c7f1d49001e51409bddc46303966ce89a65af4f4e6004896412"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.6.0"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: aa6199f908078bb1c5efb8d8638d4ae191aac11b311132c3ef48ce352fb52ef8
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.2"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "178d74305e7866013777bab2c3d8726205dc5a4dd935297175b19a23a2e66571"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.2"
+  intl:
+    dependency: "direct main"
+    description:
+      name: intl
+      sha256: "3df61194eb431efc39c4ceba583b95633a403f46c9fd341e550ce0bfa50e9aa5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.20.2"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: dfd5a80599cf0165756e3181807ed3e77daf6dd4137caaad72d0b7931597650b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.5"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      sha256: "53385261521cc4a0c4658fd0ad07a7d14591cf8fc33abbceae306ddb974888dc"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.2"
+  json_annotation:
+    dependency: transitive
+    description:
+      name: json_annotation
+      sha256: "1ce844379ca14835a50d2f019a3099f419082cfdd231cd86a142af94dd5c6bb1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.9.0"
+  leak_tracker:
+    dependency: transitive
+    description:
+      name: leak_tracker
+      sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.0.2"
+  leak_tracker_flutter_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_flutter_testing
+      sha256: "1dbc140bb5a23c75ea9c4811222756104fbcd1a27173f0c34ca01e16bea473c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.10"
+  leak_tracker_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_testing
+      sha256: "8d5a2d49f4a66b49744b23b018848400d23e54caf9463f4eb20df3eb8acb2eb1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: a5e2b223cb7c9c8efdc663ef484fdd95bb243bff242ef5b13e26883547fce9a0
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
+  markdown:
+    dependency: transitive
+    description:
+      name: markdown
+      sha256: "935e23e1ff3bc02d390bad4d4be001208ee92cc217cb5b5a6c19bc14aaa318c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.3.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: dc58c723c3c24bf8d3e2d3ad3f2f9d7bd9cf43ec6feaa64181775e60190153f2
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.17"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.11.1"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.17.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
+  mockito:
+    dependency: transitive
+    description:
+      name: mockito
+      sha256: dac24d461418d363778d53198d9ac0510b9d073869f078450f195766ec48d05e
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.6.1"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      sha256: "6e7eac89047ab8a8d26cf16127b5ed26de65209847630400f9aefd7cd5c730db"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: f096c55ebb7deb7e384101542bfba8c52696c1b56fca2eb62827989ef2353bbc
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.1"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      sha256: f7a1fe3a634fe7734c8d3f2766ad746ae2a2884abe22e241a8b301bf5cac3279
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.1"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      sha256: "88f5779f72ba699763fa3a3b06aa4bf6de76c8e5de842cf6f29e2e06476c2334"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      sha256: bd6f00dbd873bfb70d0761682da2b3a2c2fccc2b9e84c495821639601d81afe7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.6"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.8"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "978783255c543aa3586a1b3c21f6e9d720eb315376a915872c61ef8b5c20177d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.2"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "5bfcf68ca79ef689f8990d1160781b4bad40a3bd5e5218ad4076ddb7f4081585"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  pubspec_parse:
+    dependency: transitive
+    description:
+      name: pubspec_parse
+      sha256: "0560ba233314abbed0a48a2956f7f022cce7c3e1e73df540277da7544cad4082"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.0"
+  riverpod:
+    dependency: transitive
+    description:
+      name: riverpod
+      sha256: "16ff608d21e8ea64364f2b7c049c94a02ab81668f78845862b6e88b71dd4935a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.0"
+  riverpod_analyzer_utils:
+    dependency: transitive
+    description:
+      name: riverpod_analyzer_utils
+      sha256: "947b05d04c52a546a2ac6b19ef2a54b08520ff6bdf9f23d67957a4c8df1c3bc0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0-dev.8"
+  riverpod_annotation:
+    dependency: "direct main"
+    description:
+      name: riverpod_annotation
+      sha256: cc1474bc2df55ec3c1da1989d139dcef22cd5e2bd78da382e867a69a8eca2e46
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
+  riverpod_generator:
+    dependency: "direct dev"
+    description:
+      name: riverpod_generator
+      sha256: e43b1537229cc8f487f09b0c20d15dba840acbadcf5fc6dad7ad5e8ab75950dc
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0+1"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      sha256: "2939ae520c9024cb197fc20dee269cd8cdbf564c8b5746374ec6cacdc5169e64"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.4"
+  shared_preferences_android:
+    dependency: transitive
+    description:
+      name: shared_preferences_android
+      sha256: "83af5c682796c0f7719c2bbf74792d113e40ae97981b8f266fa84574573556bc"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.18"
+  shared_preferences_foundation:
+    dependency: transitive
+    description:
+      name: shared_preferences_foundation
+      sha256: "4e7eaffc2b17ba398759f1151415869a34771ba11ebbccd1b0145472a619a64f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.6"
+  shared_preferences_linux:
+    dependency: transitive
+    description:
+      name: shared_preferences_linux
+      sha256: "580abfd40f415611503cae30adf626e6656dfb2f0cee8f465ece7b6defb40f2f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  shared_preferences_platform_interface:
+    dependency: transitive
+    description:
+      name: shared_preferences_platform_interface
+      sha256: "57cbf196c486bc2cf1f02b85784932c6094376284b3ad5779d1b1c6c6a816b80"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  shared_preferences_web:
+    dependency: transitive
+    description:
+      name: shared_preferences_web
+      sha256: c49bd060261c9a3f0ff445892695d6212ff603ef3115edbb448509d407600019
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.3"
+  shared_preferences_windows:
+    dependency: transitive
+    description:
+      name: shared_preferences_windows
+      sha256: "94ef0f72b2d71bc3e700e025db3710911bd51a71cefb65cc609dd0d9a982e3c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: e7dd780a7ffb623c57850b33f43309312fc863fb6aa3d276a754bb299839ef12
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.2"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      sha256: "89f967eca29607c933ba9571d838be31d67f53f6e4ee15147d5dc2934fee1b1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      sha256: c87c3875f91262785dade62d135760c2c69cb217ac759485334c5857ad89f6e3
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.3"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "3632775c8e90d6c9712f883e633716432a27758216dfb61bd86a8321c0580925"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  source_gen:
+    dependency: transitive
+    description:
+      name: source_gen
+      sha256: "07b277b67e0096c45196cbddddf2d8c6ffc49342e88bf31d460ce04605ddac75"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.1"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      sha256: c0713a43e323c3302c2abe2a1cc89aa057a387101ebd280371d6a6c9fa68516b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      sha256: "190222579a448b03896e0ca6eca5998fa810fda630c1d65e2f78b3f638f54812"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.10.13"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.12.1"
+  state_notifier:
+    dependency: transitive
+    description:
+      name: state_notifier
+      sha256: b8677376aa54f2d7c58280d5a007f9e8774f1968d1fb1c096adcb4792fba29bb
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  stream_transform:
+    dependency: transitive
+    description:
+      name: stream_transform
+      sha256: ad47125e588cfd37a9a7f86c7d6356dde8dfe89d071d293f80ca9e9273a33871
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.2"
+  test:
+    dependency: transitive
+    description:
+      name: test
+      sha256: "75906bf273541b676716d1ca7627a17e4c4070a3a16272b7a3dc7da3b9f3f6b7"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.26.3"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: ab2726c1a94d3176a45960b6234466ec367179b87dd74f1611adb1f3b5fb9d55
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.7"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      sha256: "0cc24b5ff94b38d2ae73e1eb43cc302b77964fbf67abad1e296025b78deb53d0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.12"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: "45caa6c5917fa127b5dbcfbd1fa60b14e583afdc08bfc96dda38886ca252eb60"
+      url: "https://pub.dev"
+    source: hosted
+    version: "15.0.2"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: f52385d4f73589977c80797e60fe51014f7f2b957b5e9a62c3f6ada439889249
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  web_socket:
+    dependency: transitive
+    description:
+      name: web_socket
+      sha256: "34d64019aa8e36bf9842ac014bb5d2f5586ca73df5e4d9bf5c936975cae6982c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
+  web_socket_channel:
+    dependency: "direct main"
+    description:
+      name: web_socket_channel
+      sha256: d645757fb0f4773d602444000a8131ff5d48c9e47adfe9772652dd1a4f2d45c8
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      sha256: "87d3f2333bb240704cd3f1c6b5b7acd8a10e7f0bc28c28dcf14e782014f4a572"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      sha256: "7a3f37b05d989967cdddcbb571f1ea834867ae2faa29725fd085180e0883aa15"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: b9da305ac7c39faa3f030eccd175340f968459dae4af175130b3fc47e40d76ce
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.3"
+sdks:
+  dart: ">=3.9.0 <4.0.0"
+  flutter: ">=3.35.0"
diff --git a/flutter/pubspec.yaml b/flutter/pubspec.yaml
new file mode 100644
index 0000000..3a5121e
--- /dev/null
+++ b/flutter/pubspec.yaml
@@ -0,0 +1,46 @@
+name: ai_chatbot
+description: AI Chatbot Flutter Application
+
+publish_to: 'none'
+
+version: 1.0.0+1
+
+environment:
+  sdk: '>=3.0.0 <4.0.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  # UI
+  cupertino_icons: ^1.0.6
+
+  # State Management
+  flutter_riverpod: ^3.1.0
+  riverpod_annotation: ^4.0.0
+
+  # HTTP & WebSocket
+  http: ^1.2.0
+  web_socket_channel: ^3.0.3
+
+  # Utilities
+  intl: ^0.20.2
+  shared_preferences: ^2.2.2
+  flutter_dotenv: ^6.0.0
+
+  # UI Components
+  flutter_markdown_plus: ^1.0.1
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  flutter_lints: ^6.0.0
+  riverpod_generator: ^4.0.0+1
+  build_runner: ^2.4.8
+
+flutter:
+  uses-material-design: true
+
+  assets:
+    - assets/
diff --git a/flutter/test/message_test.dart b/flutter/test/message_test.dart
new file mode 100644
index 0000000..660a6ac
--- /dev/null
+++ b/flutter/test/message_test.dart
@@ -0,0 +1,55 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:ai_chatbot/models/message.dart';
+
+void main() {
+  group('Message', () {
+    test('should create a Message from JSON', () {
+      final json = {
+        'id': '123',
+        'content': 'Hello',
+        'role': 'user',
+        'timestamp': '2024-01-01T00:00:00.000Z',
+      };
+
+      final message = Message.fromJson(json);
+
+      expect(message.id, '123');
+      expect(message.content, 'Hello');
+      expect(message.role, MessageRole.user);
+    });
+
+    test('should convert Message to JSON', () {
+      final message = Message(
+        id: '123',
+        content: 'Hello',
+        role: MessageRole.user,
+        timestamp: DateTime.utc(2024, 1, 1),
+      );
+
+      final json = message.toJson();
+
+      expect(json['id'], '123');
+      expect(json['content'], 'Hello');
+      expect(json['role'], 'user');
+      expect(json['timestamp'], '2024-01-01T00:00:00.000Z');
+    });
+
+    test('should copy Message with new values', () {
+      final original = Message(
+        id: '123',
+        content: 'Hello',
+        role: MessageRole.user,
+        timestamp: DateTime.now(),
+      );
+
+      final copied = original.copyWith(content: 'Updated');
+
+      expect(copied.id, original.id);
+      expect(copied.content, 'Updated');
+      expect(copied.role, original.role);
+    });
+  });
+}
+
+
diff --git a/flutter/test/session_test.dart b/flutter/test/session_test.dart
new file mode 100644
index 0000000..1ac2568
--- /dev/null
+++ b/flutter/test/session_test.dart
@@ -0,0 +1,66 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:ai_chatbot/models/session.dart';
+
+void main() {
+  group('ChatSession', () {
+    test('should create a ChatSession from JSON', () {
+      final json = {
+        'session_id': 'session-123',
+        'user_id': 'user-456',
+        'status': 'active',
+        'created_at': '2024-01-01T00:00:00.000Z',
+      };
+
+      final session = ChatSession.fromJson(json);
+
+      expect(session.sessionId, 'session-123');
+      expect(session.userId, 'user-456');
+      expect(session.status, 'active');
+      expect(session.isActive, true);
+    });
+
+    test('should convert ChatSession to JSON', () {
+      final session = ChatSession(
+        sessionId: 'session-123',
+        userId: 'user-456',
+        status: 'active',
+        createdAt: DateTime(2024, 1, 1),
+      );
+
+      final json = session.toJson();
+
+      expect(json['session_id'], 'session-123');
+      expect(json['user_id'], 'user-456');
+      expect(json['status'], 'active');
+    });
+
+    test('should not throw when session_id is null', () {
+      final json = {
+        'session_id': null,
+        'user_id': 'user-456',
+        'status': 'active',
+        'created_at': '2024-01-01T00:00:00.000Z',
+      };
+
+      final session = ChatSession.fromJson(json);
+
+      expect(session.sessionId, '');
+    });
+
+    test('should set createdAt to null when created_at is invalid', () {
+      final json = {
+        'session_id': 'session-123',
+        'user_id': 'user-456',
+        'status': 'active',
+        'created_at': 'not-a-date',
+      };
+
+      final session = ChatSession.fromJson(json);
+
+      expect(session.createdAt, isNull);
+    });
+  });
+}
+
+