sunpeak

A tool to build and test chat-based apps.

Description

sunpeak is an open-source framework for building, testing, and shipping ChatGPT Apps and MCP Apps that run inside AI chat clients like ChatGPT and Claude; it provides a local Apps SDK runtime simulator, typed React hooks, pre-built UI components, an MCP dev server with hot reload, CLI tooling, and Vitest/Playwright integration so you can develop and run deterministic, automated tests for LLM-driven interactive UIs and tool invocations without a paid ChatGPT account.

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