Live Testing for Claude Connectors and ChatGPT Apps

The sunpeak simulator tests cover a lot. They replicate the ChatGPT and Claude runtimes, run display mode transitions, test themes, and validate tool invocations without any paid accounts or AI credits. For most development work, they're enough. But simulators don't catch everything. Real ChatGPT wraps your app in a nested iframe sandbox. The MCP protocol goes through ChatGPT's actual connection layer. Resource loading happens over a real network with production builds. There's a gap between "works in the simulator" and "works in ChatGPT," and the only way to close it is to test against the real thing. sunpeak 0.16.23 adds live testing: automated Playwright tests that run against real ChatGPT. You write the same kind of assertions you write for simulator tests, and sunpeak handles authentication, MCP server refresh, host-specific message formatting, and iframe traversal. TL;DR: Run pnpm test:live with a tunnel active. sunpeak imports your browser session, starts the dev server, refresh