diff --git a/templates/README.md b/templates/README.md
index b5f8d5ee..b808be17 100644
--- a/templates/README.md
+++ b/templates/README.md
@@ -6,12 +6,14 @@
 
 ### ワークフロー（`workflows/`）
 
-| テンプレート                | 対象                            | 自動適用条件                     |
-| --------------------------- | ------------------------------- | -------------------------------- |
-| `dependabot-auto-merge.yml` | Dependabot を使う全プロジェクト | dependabot.yml が存在する場合    |
-| `label-sync.yml`            | 全プロジェクト                  | 常に推奨                         |
-| `stale.yml`                 | Issue/PR が多いプロジェクト     | 常に推奨                         |
-| `terraform-drift.yml`       | Terraform プロジェクト          | Terraform ファイルが存在する場合 |
+| テンプレート                | 対象                            | 自動適用条件                      |
+| --------------------------- | ------------------------------- | --------------------------------- |
+| `dependabot-auto-merge.yml` | Dependabot を使う全プロジェクト | dependabot.yml が存在する場合     |
+| `label-sync.yml`            | 全プロジェクト                  | 常に推奨                          |
+| `stale.yml`                 | Issue/PR が多いプロジェクト     | 常に推奨                          |
+| `terraform-drift.yml`       | Terraform プロジェクト          | Terraform ファイルが存在する場合  |
+| `e2e-playwright.yml`        | Playwright E2E テスト           | test:e2e スクリプトが存在する場合 |
+| `claude.yml`                | Claude Code 連携                | 常に推奨                          |
 
 ### pre-commit（`pre-commit-config-*.yaml`）
 
@@ -34,6 +36,25 @@
 | `SECURITY.md`              | セキュリティポリシー                             | 中     |
 | `CONTRIBUTING.md`          | コントリビューションガイド                       | 低     |
 
+### コードスタイル（Prettier / lint-staged）
+
+| テンプレート                      | いつ使う                                             |
+| --------------------------------- | ---------------------------------------------------- |
+| `prettierrc-base.json`            | **標準**: printWidth 80、arrowParens "avoid"         |
+| `prettierrc-wide.json`            | **ワイド**: printWidth 120、arrowParens "always"     |
+| `prettierignore`                  | **全プロジェクト**: 共通の除外パターン               |
+| `lintstagedrc-eslint.json`        | **ESLint + Prettier**: lint + format on staged files |
+| `lintstagedrc-biome.json`         | **Biome**: check + format on staged files            |
+| `lintstagedrc-prettier-only.json` | **Prettier のみ**: format on staged files            |
+
+### Git Hooks（`husky/`）
+
+| テンプレート | 内容                                                |
+| ------------ | --------------------------------------------------- |
+| `pre-commit` | lint-staged + ファイル長チェック                    |
+| `commit-msg` | commitlint（Conventional Commits）                  |
+| `pre-push`   | typecheck + lint + test（スクリプト存在時のみ実行） |
+
 ### その他
 
 | テンプレート   | 対象                                  |
diff --git a/templates/husky/commit-msg b/templates/husky/commit-msg
new file mode 100755
index 00000000..f0abd676
--- /dev/null
+++ b/templates/husky/commit-msg
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+npx --no -- commitlint --edit "$1"
diff --git a/templates/husky/pre-commit b/templates/husky/pre-commit
new file mode 100755
index 00000000..9979f130
--- /dev/null
+++ b/templates/husky/pre-commit
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# lint-staged: フォーマット・リント
+npx lint-staged || exit 1
+
+# ファイル長チェック（script/check-file-length.sh が存在する場合のみ）
+if [ -f script/check-file-length.sh ]; then
+  bash script/check-file-length.sh || exit 1
+fi
diff --git a/templates/husky/pre-push b/templates/husky/pre-push
new file mode 100755
index 00000000..4f772d93
--- /dev/null
+++ b/templates/husky/pre-push
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+echo "Pre-push checks..."
+
+# TypeScript 型チェック（スクリプト未定義時はスキップ）
+if npm run typecheck --if-present; then
+  echo "-> TypeScript check passed"
+else
+  echo "TypeScript check failed"; exit 1
+fi
+
+# Lint（スクリプト未定義時はスキップ）
+if npm run lint --if-present; then
+  echo "-> Lint passed"
+else
+  echo "Lint failed"; exit 1
+fi
+
+# テスト（スクリプト未定義時はスキップ）
+if npm run --if-present test; then
+  echo "-> Tests passed"
+else
+  echo "Tests failed"; exit 1
+fi
+
+echo "All pre-push checks passed"
diff --git a/templates/lintstagedrc-biome.json b/templates/lintstagedrc-biome.json
new file mode 100644
index 00000000..a4125135
--- /dev/null
+++ b/templates/lintstagedrc-biome.json
@@ -0,0 +1,5 @@
+{
+  "*.{ts,tsx,js,jsx}": ["biome check --fix --no-errors-on-unmatched"],
+  "*.{json,md}": ["biome format --write --no-errors-on-unmatched"],
+  "*.{yaml,yml}": ["prettier --write"]
+}
diff --git a/templates/lintstagedrc-eslint.json b/templates/lintstagedrc-eslint.json
new file mode 100644
index 00000000..af752ac7
--- /dev/null
+++ b/templates/lintstagedrc-eslint.json
@@ -0,0 +1,5 @@
+{
+  "*.{ts,tsx}": ["eslint --fix", "prettier --write"],
+  "*.{js,jsx,mjs,cjs}": ["eslint --fix", "prettier --write"],
+  "*.{json,css,md,yml,yaml}": ["prettier --write"]
+}
diff --git a/templates/lintstagedrc-prettier-only.json b/templates/lintstagedrc-prettier-only.json
new file mode 100644
index 00000000..deecafba
--- /dev/null
+++ b/templates/lintstagedrc-prettier-only.json
@@ -0,0 +1,3 @@
+{
+  "*.{js,jsx,ts,tsx,css,md,json,yaml,yml}": ["prettier --write"]
+}
diff --git a/templates/prettierignore b/templates/prettierignore
new file mode 100644
index 00000000..662c7eba
--- /dev/null
+++ b/templates/prettierignore
@@ -0,0 +1,34 @@
+# Dependencies
+node_modules/
+
+# Build outputs
+.next/
+out/
+dist/
+build/
+coverage/
+
+# Lock files
+package-lock.json
+pnpm-lock.yaml
+yarn.lock
+
+# Environment
+.env
+.env.*
+
+# IDE / OS
+.vscode/
+.idea/
+.DS_Store
+
+# Claude Code
+.claude/settings.local.json
+
+# Terraform
+*.tfstate
+*.tfstate.*
+.terraform/
+
+# Supabase
+supabase/.temp/
diff --git a/templates/prettierrc-base.json b/templates/prettierrc-base.json
new file mode 100644
index 00000000..b7e4e9d9
--- /dev/null
+++ b/templates/prettierrc-base.json
@@ -0,0 +1,28 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "useTabs": false,
+  "trailingComma": "all",
+  "printWidth": 80,
+  "endOfLine": "lf",
+  "arrowParens": "avoid",
+  "bracketSpacing": true,
+  "bracketSameLine": false,
+  "quoteProps": "as-needed",
+  "jsxSingleQuote": true,
+  "overrides": [
+    {
+      "files": "*.json",
+      "options": {
+        "singleQuote": false
+      }
+    },
+    {
+      "files": "*.md",
+      "options": {
+        "proseWrap": "preserve"
+      }
+    }
+  ]
+}
diff --git a/templates/prettierrc-wide.json b/templates/prettierrc-wide.json
new file mode 100644
index 00000000..e1d8bc22
--- /dev/null
+++ b/templates/prettierrc-wide.json
@@ -0,0 +1,28 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "useTabs": false,
+  "trailingComma": "all",
+  "printWidth": 120,
+  "endOfLine": "lf",
+  "arrowParens": "always",
+  "bracketSpacing": true,
+  "bracketSameLine": false,
+  "quoteProps": "as-needed",
+  "jsxSingleQuote": false,
+  "overrides": [
+    {
+      "files": "*.json",
+      "options": {
+        "singleQuote": false
+      }
+    },
+    {
+      "files": "*.md",
+      "options": {
+        "proseWrap": "preserve"
+      }
+    }
+  ]
+}
diff --git a/templates/workflows/claude.yml b/templates/workflows/claude.yml
new file mode 100644
index 00000000..7c04259d
--- /dev/null
+++ b/templates/workflows/claude.yml
@@ -0,0 +1,104 @@
+# Claude Code ワークフロー
+#
+# Issue や PR で @claude をメンションすると Claude Code が応答する。
+# Bot からのイベントは自動除外。
+# PR イベント（pull_request_review_comment / pull_request_review）では Draft PR も除外。
+# issue_comment イベントでは Draft 判定不可のため除外なし。
+#
+# 使い方:
+#   .github/workflows/claude.yml にコピーして配置
+#   リポジトリ Secret に CLAUDE_CODE_OAUTH_TOKEN を設定
+#
+# カスタマイズ:
+#   - timeout-minutes: タイムアウト（デフォルト: 20分）
+#   - allowed_tools: Claude に許可するツール
+#   - claude_args: 追加の system prompt 等
+#
+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened]
+  pull_request_review:
+    types: [submitted]
+
+permissions: {}
+
+concurrency:
+  # イベント種別 + トリガーのコメント/レビューIDを含めることで、
+  # 同一 PR/Issue 内でも異なるメンションが互いをキャンセルしない
+  group: >-
+    claude-${{ github.repository }}-${{
+      github.event.issue.number
+      || github.event.pull_request.number
+      || github.run_id
+    }}-${{
+      github.event.comment.id
+      || github.event.review.id
+      || github.run_id
+    }}
+  cancel-in-progress: false
+
+jobs:
+  claude:
+    # Bot 全般を除外し、信頼済み Association のみ許可
+    # OWNER / MEMBER / COLLABORATOR: リポジトリ管理者・チームメンバー・招待コラボレーター
+    if: |
+      github.event.sender.type != 'Bot' &&
+      contains(fromJSON('["OWNER","MEMBER","COLLABORATOR"]'),
+        github.event.comment.author_association ||
+        github.event.review.author_association ||
+        github.event.issue.author_association
+      ) &&
+      (
+        (github.event_name == 'issue_comment' && contains(github.event.comment.body || '', '@claude')) ||
+        (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body || '', '@claude') &&
+          github.event.pull_request.draft == false) ||
+        (github.event_name == 'pull_request_review' && contains(github.event.review.body || '', '@claude') &&
+          github.event.pull_request.draft == false) ||
+        (github.event_name == 'issues' && (contains(github.event.issue.body || '', '@claude') || contains(github.event.issue.title || '', '@claude')))
+      )
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+      id-token: write
+      actions: read
+      checks: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@6e2bd52842c65e914eba5c8badd17560bd26b5de # v1.0.89
+        with:
+          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+
+          additional_permissions: |
+            actions: read
+            checks: read
+
+          settings: |
+            {
+              "permissions": {
+                "allowedTools": [
+                  "Bash(gh:*)",
+                  "Bash(git:*)",
+                  "Bash(npm:*)",
+                  "Bash(pnpm:*)",
+                  "Bash(npx:*)"
+                ]
+              }
+            }
+
+          claude_args: |
+            --system-prompt "When working on GitHub Issues (not PRs), after completing all code changes and pushing to a branch, you MUST create a Pull Request by running 'gh pr create' command. Do not just provide a link - actually execute the gh pr create command to create the PR automatically."
diff --git a/templates/workflows/e2e-playwright.yml b/templates/workflows/e2e-playwright.yml
new file mode 100644
index 00000000..d14c6f9f
--- /dev/null
+++ b/templates/workflows/e2e-playwright.yml
@@ -0,0 +1,99 @@
+# E2E Playwright テストワークフロー
+#
+# Playwright を使った E2E テストを実行する再利用可能ワークフロー。
+# Next.js アプリケーションのビルド → Playwright テスト → レポートアップロード。
+#
+# 使い方:
+#   .github/workflows/e2e-playwright.yml にコピーして配置
+#   package.json に test:e2e スクリプトを定義
+#
+# カスタマイズ:
+#   - NODE_VERSION: Node.js バージョン（デフォルト: 22）
+#   - PACKAGE_MANAGER: npm / pnpm（デフォルト: npm）
+#   - PLAYWRIGHT_VERSION: Playwright コンテナバージョン
+#   - E2E_COMMAND: テスト実行コマンド
+#   - WORKING_DIRECTORY: アプリケーションのルート
+#
+name: E2E Tests
+
+on:
+  workflow_call:
+    inputs:
+      node-version:
+        description: 'Node.js version'
+        type: string
+        default: '22'
+      package-manager:
+        description: 'Package manager (npm or pnpm)'
+        type: string
+        default: 'npm'
+      e2e-command:
+        description: 'E2E test command'
+        type: string
+        default: 'npm run test:e2e'
+      working-directory:
+        description: 'Working directory for the app'
+        type: string
+        default: '.'
+      build-command:
+        description: 'Build command (empty to skip)'
+        type: string
+        default: 'npm run build'
+
+# スタンドアロンで使う場合は上記 workflow_call を以下に置き換える:
+#   push:
+#     branches: [main]
+#   pull_request:
+#     branches: [main]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-e2e-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  e2e:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    defaults:
+      run:
+        working-directory: ${{ inputs.working-directory || '.' }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Setup pnpm
+        if: inputs.package-manager == 'pnpm'
+        uses: pnpm/action-setup@a7487c7e89a18df77bdb2544e188270c5d72bfce # v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
+        with:
+          node-version: ${{ inputs.node-version || '22' }}
+          cache: ${{ inputs.package-manager || 'npm' }}
+
+      - name: Install dependencies
+        run: ${{ inputs.package-manager == 'pnpm' && 'pnpm install --frozen-lockfile' || 'npm ci' }}
+
+      - name: Build
+        if: inputs.build-command != ''
+        run: ${{ inputs.build-command || 'npm run build' }}
+
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium
+
+      - name: Run E2E tests
+        run: ${{ inputs.e2e-command || 'npm run test:e2e' }}
+
+      - name: Upload Playwright report
+        if: ${{ !cancelled() }}
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        with:
+          name: playwright-report
+          path: |
+            ${{ inputs.working-directory || '.' }}/playwright-report/
+            ${{ inputs.working-directory || '.' }}/test-results/
+          retention-days: 14