Traditional MCP:  923 endpoints → 923 tools → ~100K tokens → constant maintenance
Code Mode:        923 endpoints → 2 tools   → ~1K tokens   → zero maintenance

claude mcp add appstore-connect -s user \
  -e APP_STORE_KEY_ID=YOUR_KEY_ID \
  -e APP_STORE_ISSUER_ID=YOUR_ISSUER_ID \
  -e APP_STORE_P8_PATH=/absolute/path/to/AuthKey_XXXXXXXXXX.p8 \
  -e APP_STORE_VENDOR_NUMBER=YOUR_VENDOR_NUMBER \
  -- npx -y @trialanderror-ai/appstore-connect-mcp

{
  "mcpServers": {
    "appstore-connect": {
      "command": "npx",
      "args": ["-y", "@trialanderror-ai/appstore-connect-mcp"],
      "env": {
        "APP_STORE_KEY_ID": "YOUR_KEY_ID",
        "APP_STORE_ISSUER_ID": "YOUR_ISSUER_ID",
        "APP_STORE_P8_PATH": "/path/to/AuthKey_XXXXXXXXXX.p8",
        "APP_STORE_VENDOR_NUMBER": "YOUR_VENDOR_NUMBER"
      }
    }
  }
}

{
  "mcpServers": {
    "appstore-connect": {
      "command": "npx",
      "args": ["-y", "@trialanderror-ai/appstore-connect-mcp"],
      "env": {
        "APP_STORE_KEY_ID": "YOUR_KEY_ID",
        "APP_STORE_ISSUER_ID": "YOUR_ISSUER_ID",
        "APP_STORE_P8_PATH": "/path/to/AuthKey_XXXXXXXXXX.p8"
      }
    }
  }
}

git clone https://github.com/TrialAndErrorAI/appstore-connect-mcp
cd appstore-connect-mcp
npm install
npm run build

search: "Find all endpoints related to customer reviews"

const reviews = Object.entries(spec.paths)
  .filter(([p]) => p.includes('customerReview'))
  .map(([path, methods]) => ({
    path,
    methods: Object.keys(methods).map(m => m.toUpperCase())
  }));
return reviews;

execute: "List all my apps"

const apps = await api.request({ method: 'GET', path: '/v1/apps' });
return apps.data.map(a => ({ id: a.id, name: a.attributes.name }));

execute: "Get latest reviews for my first app"

const apps = await api.request({ method: 'GET', path: '/v1/apps', params: { limit: '1' } });
const appId = apps.data[0].id;
const reviews = await api.request({
  method: 'GET',
  path: `/v1/apps/${appId}/customerReviews`,
  params: { limit: '5', sort: '-createdDate' }
});
return {
  app: apps.data[0].attributes.name,
  reviews: reviews.data.map(r => ({
    rating: r.attributes.rating,
    title: r.attributes.title,
    body: r.attributes.body
  }))
};

Claude writes JavaScript
    │
    ▼
┌─────────────────────────────────────────────────┐
│ search({ code })                                │
│  Sandbox executes code against OpenAPI spec     │
│  923 paths, 1337 schemas — pre-resolved $refs   │
│  Returns: matching endpoints + parameters       │
└─────────────────────────────────────────────────┘
    │
    ▼
┌─────────────────────────────────────────────────┐
│ execute({ code })                               │
│  Sandbox executes code against auth'd client    │
│  JWT injected — code never sees credentials     │
│  Supports GET/POST/PATCH/DELETE + chaining      │
│  Auto-decompresses gzipped report responses     │
│  Returns: API response (truncated to 40K chars) │
└─────────────────────────────────────────────────┘

src/
├── auth/jwt-manager.ts      — JWT with P8 key, ES256, 19-min cache
├── api/client.ts             — HTTP client, rate limiting, gzip handling
├── spec/
│   ├── openapi.json          — Apple's official spec (923 endpoints)
│   └── loader.ts             — Loads + resolves $refs for flat traversal
├── executor/sandbox.ts       — vm-based sandboxed execution
├── server/mcp-server.ts      — MCP server (search, execute, test_connection)
└── index.ts                  — Entry point

npm install          # Install dependencies
npm run build        # Compile + copy spec
npm run dev          # Watch mode (tsx)
npm start            # Run compiled server
npm run type-check   # TypeScript check