MCP App framework. ChatGPT App framework. MCP testing framework. Claude Connector framework. MCP App Inspector with a ChatGPT & Claude runtime. MCP App framework. ChatGPT App framework. MCP testing framework. Claude Connector framework. MCP App Inspector with a ChatGPT & Claude runtime.

sunpeak-app/
├── src/
│   ├── resources/
│   │   └── review/
│   │       └── review.tsx          # UI component (React)
│   ├── tools/
│   │   ├── review-diff.ts          # Tool handler + schema + resource link
│   │   └── review.ts               # Backend-only tool (no UI)
│   └── server.ts                   # Optional: auth, server config
├── tests/
│   ├── simulations/
│   │   └── review-diff.json        # Mock data for the inspector
│   ├── e2e/
│   │   └── review.spec.ts          # Playwright tests against the inspector
│   └── evals/
│       └── review.eval.ts          # Multi-model tool calling evals
└── package.json

import { test, expect } from 'sunpeak/test';

test('search tool returns results', async ({ mcp }) => {
  const result = await mcp.callTool('search', { query: 'headphones' });
  expect(result.isError).toBeFalsy();
});

test('album cards render', async ({ inspector }) => {
  const result = await inspector.renderTool('show-albums');
  await expect(result.app().locator('button:has-text("Summer Slice")')).toBeVisible();
});