Google Stitch MCP × Antigravity — Vibe Design から実装までを完全自動化するパイプライン

# Stitch MCP サーバーのインストール
npm install @google/stitch-mcp-server
 
# MCP サーバーの起動
stitch-mcp-server --port=3000 --api-key=$STITCH_API_KEY
 
# サーバーステータス確認
curl http://localhost:3000/health
 
# 出力:
# {
#   "status": "healthy",
#   "version": "1.0.0",
#   "capabilities": [
#     "design_export",
#     "vibe_design",
#     "voice_canvas",
#     "component_generation"
#   ]
# }

# Stitch デザインをMCP経由で取得
curl -X POST http://localhost:3000/mcp/call \
  -H "Content-Type: application/json" \
  -d '{
    "method": "design.export",
    "params": {
      "design_id": "stitch-app-ui-001",
      "format": "json_schema",
      "include_assets": true,
      "include_interactions": true
    }
  }'
 
# 出力: デザイン構造化データ
{
  "design_id": "stitch-app-ui-001",
  "name": "Mobile App UI",
  "components": [
    {
      "id": "comp_header",
      "type": "header",
      "properties": {
        "background_color": "#1a1a1a",
        "height": "64px",
        "shadow": true
      },
      "children": [
        {
          "id": "comp_logo",
          "type": "image",
          "properties": {
            "src": "assets/logo.png",
            "width": "40px",
            "height": "40px"
          }
        }
      ]
    }
  ],
  "design_tokens": {
    "colors": {
      "primary": "#007AFF",
      "secondary": "#5AC8FA",
      "background": "#F5F5F5"
    },
    "typography": {
      "heading": { "font": "SF Pro Display", "size": "24px", "weight": 700 },
      "body": { "font": "SF Pro Text", "size": "16px", "weight": 400 }
    },
    "spacing": {
      "xs": "4px",
      "sm": "8px",
      "md": "16px",
      "lg": "24px"
    }
  }
}

# Vibe Design API 経由でのデザイン生成
curl -X POST http://localhost:3000/mcp/call \
  -H "Content-Type: application/json" \
  -d '{
    "method": "vibe_design.generate",
    "params": {
      "prompt": "ダークモードの e-commerce モバイルアプリ。ヘッダーに検索機能、メインには商品グリッド、フッターに購入カート",
      "style_preset": "modern_minimal",
      "color_scheme": "dark",
      "accessibility": true
    }
  }'
 
# 出力: 生成されたデザイン構造
{
  "design_id": "vibe-ecommerce-dark-001",
  "status": "success",
  "design": {
    "screens": [
      {
        "id": "screen_home",
        "name": "Home Screen",
        "layout": "flex",
        "components": [
          {
            "id": "header_search",
            "type": "search_bar",
            "properties": {
              "placeholder": "商品を検索...",
              "icon_position": "left"
            }
          },
          {
            "id": "product_grid",
            "type": "grid",
            "properties": {
              "columns": 2,
              "gap": "16px",
              "items": [/* 商品コンポーネント */]
            }
          }
        ]
      }
    ],
    "tokens": {
      "colors": { /* デザイントークン */ },
      "typography": { /* フォント設定 */ }
    }
  }
}

# Antigravity 環境のセットアップ
npm install @antigravity/core @antigravity/stitch-adapter
 
# antigravity.config.ts
import { AntigravityConfig } from '@antigravity/core';
import { StitchAdapter } from '@antigravity/stitch-adapter';
 
export const config: AntigravityConfig = {
  adapters: [
    new StitchAdapter({
      mcp_url: 'http://localhost:3000',
      api_key: process.env.STITCH_API_KEY,
      design_sync_interval: '5m',
      auto_publish: true
    })
  ],
  output: {
    directory: './src/generated',
    framework: 'react',
    typescript: true
  }
};

# Antigravity CLI で Stitch デザイン → React コンポーネント変換
antigravity sync \
  --source=stitch \
  --design-id=vibe-ecommerce-dark-001 \
  --output=src/components/ecommerce
 
# 処理ステップ:
# 1. Stitch MCP から設計構造を取得
# 2. コンポーネント依存関係を解析
# 3. React コンポーネントコード生成
# 4. デザイントークン → CSS-in-JS 変換
# 5. 型定義（TypeScript）を自動生成
# 6. テストフレームワーク用のスナップショット作成

// src/generated/components/ECommerceHome.tsx
// 自動生成（Stitch MCP + Antigravity）
 
import React, { useState } from 'react';
import styled from 'styled-components';
import { DesignTokens } from '@/generated/design-tokens';
 
interface ECommerceHomeProps {
  onProductSelect?: (productId: string) => void;
  onCartUpdate?: (cartCount: number) => void;
}
 
const Container = styled.div`
  background-color: ${DesignTokens.colors.background};
  min-height: 100vh;
  display: flex;
  flex-direction: column;
`;
 
const Header = styled.header`
  background-color: ${DesignTokens.colors.surface};
  padding: ${DesignTokens.spacing.lg};
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
`;
 
const SearchBar = styled.input`
  width: 100%;
  padding: ${DesignTokens.spacing.md};
  font-family: ${DesignTokens.typography.body.font};
  font-size: ${DesignTokens.typography.body.size};
  border: 1px solid ${DesignTokens.colors.border};
  border-radius: 8px;
  background-color: ${DesignTokens.colors.inputBackground};
  color: ${DesignTokens.colors.text};
 
  &::placeholder {
    color: ${DesignTokens.colors.textSecondary};
  }
`;
 
const ProductGrid = styled.div`
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: ${DesignTokens.spacing.md};
  padding: ${DesignTokens.spacing.lg};
  flex: 1;
`;
 
export const ECommerceHome: React.FC<ECommerceHomeProps> = ({
  onProductSelect,
  onCartUpdate
}) => {
  const [searchQuery, setSearchQuery] = useState('');
  const [cartCount, setCartCount] = useState(0);
 
  const handleSearch = (e: React.ChangeEvent<HTMLInputElement>) => {
    setSearchQuery(e.target.value);
  };
 
  return (
    <Container>
      <Header>
        <SearchBar
          type="text"
          placeholder="商品を検索..."
          value={searchQuery}
          onChange={handleSearch}
        />
      </Header>
      <ProductGrid>
        {/* 商品グリッド内容 */}
      </ProductGrid>
    </Container>
  );
};
 
export default ECommerceHome;

# Voice Canvas で音声入力によるデザイン指定
stitch voice-canvas --design-output=vibe-voice-001
 
# ユーザーの音声入力:
# 「ダッシュボード画面を作ってください。
#  左にサイドバー、中央にメインコンテンツエリア、
#  上部にナビゲーション。
#  カラースキームは紺と白。
#  グラフとテーブルを中心に配置。」
 
# 結果: Vibe Design が同じ品質のデザインを生成

# pipeline.yml: Stitch → Antigravity 完全自動化
 
name: Design to Code Pipeline
on:
  design_updated:
    source: stitch
    design_ids:
      - "vibe-ecommerce-dark-001"
      - "vibe-dashboard-003"
 
jobs:
  design_sync:
    runs-on: ubuntu-latest
    steps:
      - name: Fetch Design from Stitch MCP
        run: |
          curl -X POST http://stitch-mcp:3000/mcp/call \
            -d '{"method": "design.export", "params": {...}}' \
            -o design-export.json
 
      - name: Validate Design Structure
        run: |
          antigravity validate --schema=design-schema.json design-export.json
 
      - name: Generate React Components
        run: |
          antigravity generate \
            --input=design-export.json \
            --output=src/generated/components \
            --framework=react \
            --language=typescript
 
      - name: Generate Design Tokens
        run: |
          antigravity tokens \
            --input=design-export.json \
            --output=src/generated/design-tokens.ts \
            --format=typescript-constants
 
      - name: Generate Tests
        run: |
          antigravity test \
            --components=src/generated/components \
            --output=src/generated/__tests__ \
            --snapshots=true
 
      - name: Run Tests
        run: npm test src/generated/__tests__
 
      - name: Commit Generated Code
        run: |
          git add src/generated/
          git commit -m "chore: update components from Stitch design [auto]"
          git push origin main
 
      - name: Deploy to Staging
        run: npm run deploy:staging
 
      - name: Run Visual Regression Tests
        run: npm run test:visual
 
  notify:
    needs: design_sync
    if: always()
    runs-on: ubuntu-latest
    steps:
      - name: Send Notification
        run: |
          curl -X POST https://slack-webhook \
            -d '{"text": "Design to Code パイプライン完了"}'

// design-sync-service.ts: リアルタイムデザイン監視と自動生成
 
import { StitchMCP } from '@google/stitch-mcp-server';
import { AntigravityGenerator } from '@antigravity/core';
import { EventEmitter } from 'events';
 
class DesignSyncService extends EventEmitter {
  private stitch: StitchMCP;
  private generator: AntigravityGenerator;
  private lastSyncTime: number = 0;
  private syncInterval: NodeJS.Timeout | null = null;
 
  constructor() {
    super();
    this.stitch = new StitchMCP({
      url: process.env.STITCH_MCP_URL,
      apiKey: process.env.STITCH_API_KEY
    });
    this.generator = new AntigravityGenerator();
  }
 
  start() {
    // 30秒ごとにデザイン変更をチェック
    this.syncInterval = setInterval(() => this.checkAndSync(), 30000);
    this.emit('service:started');
  }
 
  private async checkAndSync() {
    try {
      // Stitch から最新のデザインを取得
      const designs = await this.stitch.listDesigns({
        modifiedSince: this.lastSyncTime
      });
 
      if (designs.length === 0) return;
 
      this.emit('designs:found', designs.length);
 
      for (const design of designs) {
        await this.syncDesign(design);
      }
 
      this.lastSyncTime = Date.now();
      this.emit('sync:complete', { count: designs.length });
 
    } catch (error) {
      this.emit('error', error);
    }
  }
 
  private async syncDesign(design: any) {
    try {
      // デザイン構造を取得
      const designData = await this.stitch.exportDesign({
        designId: design.id,
        format: 'json_schema'
      });
 
      // React コンポーネントを生成
      const components = await this.generator.generateComponents({
        design: designData,
        framework: 'react',
        typescript: true
      });
 
      // デザイントークンを生成
      const tokens = await this.generator.generateTokens({
        design: designData,
        format: 'typescript'
      });
 
      // ファイルシステムに保存
      await this.saveGeneratedFiles(design.id, {
        components,
        tokens
      });
 
      this.emit('design:synced', {
        designId: design.id,
        componentCount: components.length
      });
 
    } catch (error) {
      this.emit('design:error', { designId: design.id, error });
    }
  }
 
  private async saveGeneratedFiles(designId: string, files: any) {
    // 実装省略
  }
 
  stop() {
    if (this.syncInterval) {
      clearInterval(this.syncInterval);
    }
    this.emit('service:stopped');
  }
}
 
// 使用例
const syncService = new DesignSyncService();
syncService.on('design:synced', (event) => {
  console.log(`✓ Design ${event.designId} synced: ${event.componentCount} components`);
});
syncService.start();

# 生成されたコンポーネントの品質分析
antigravity analyze \
  --components=src/generated/components \
  --checks=[
    "type-safety",
    "accessibility",
    "performance",
    "design-token-usage",
    "responsive-design"
  ]
 
# 出力レポート:
# ✓ Type Safety: 100%
# ✓ Accessibility: WCAG AA
# ✓ Performance: Lighthouse 95/100
# ✓ Design Token Usage: 98%
# ✓ Responsive Design: All breakpoints tested

// optimization-rules.ts: 自動最適化ルール
 
import { AntigravityOptimizer } from '@antigravity/core';
 
export const optimizationRules = [
  // メモリ化による再レンダリング最適化
  {
    rule: 'memoize_props',
    condition: (component) => component.props.length > 5,
    action: 'wrap_with_memo'
  },
 
  // 大規模リストの仮想化
  {
    rule: 'virtualize_lists',
    condition: (component) => component.hasGrid && component.itemCount > 100,
    action: 'use_react_window'
  },
 
  // CSS-in-JS の分割
  {
    rule: 'split_styled_components',
    condition: (component) => component.styledLinesOfCode > 500,
    action: 'extract_to_separate_file'
  },
 
  // アクセシビリティの自動改善
  {
    rule: 'enhance_accessibility',
    checks: [
      'add_aria_labels',
      'ensure_color_contrast',
      'add_keyboard_navigation'
    ]
  }
];
 
const optimizer = new AntigravityOptimizer();
optimizer.applyRules(optimizationRules);

# CI/CD パイプラインでの自動テスト
npm run test:components -- \
  --visual-regression \
  --screenshots-dir=./screenshots/baseline
 
# Pull Request に自動コメント:
# デザイン変更による影響分析
# - 修正されたコンポーネント数: 5
# - 新規コンポーネント数: 2
# - 削除されたコンポーネント数: 1
# - ビジュアル変更検出: 3 差分