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sunpeak
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About sunpeak
sunpeak is an open-source framework designed for developers to build, test, and deploy ChatGPT Apps and MCP Apps directly within AI chat clients like ChatGPT and Claude. It provides a local Apps SDK runtime simulator that enables rapid prototyping and debugging without requiring a paid ChatGPT account. The framework includes typed React hooks and pre-built UI components to streamline frontend development for LLM-driven interfaces. A dedicated MCP dev server with hot reload accelerates iteration, while CLI tooling simplifies project management and deployment workflows. For quality assurance, sunpeak integrates Vitest and Playwright to support deterministic, automated testing of interactive UIs and tool invocations, ensuring reliability before production release. The tool is particularly suited for developers focused on creating chat-based applications that leverage large language models for dynamic user experiences.
Key features
- Local Apps SDK runtime simulator
- Typed React hooks for frontend development
- Pre-built UI components for chat interfaces
- MCP dev server with hot reload
- CLI tooling for project management
- Vitest integration for unit testing
- Playwright integration for end-to-end testing
- Open-source framework with no paid account required
Use cases
- Building and testing ChatGPT Apps locally before deployment
- Developing MCP Apps with real-time debugging and hot reload
- Automating testing for LLM-driven interactive UIs and tool calls
Pros
- Open-source MIT license allows free use and modification
- Server-agnostic framework supports MCP Apps, ChatGPT Apps, and Claude Connectors
- Local inspector replicates ChatGPT and Claude runtimes for accurate UI testing
- Hot reloading and automatic rebuild notifications accelerate development
- Pre-built UI components and typed React hooks streamline frontend development
Cons
- Requires familiarity with Model Context Protocol (MCP) for full utilization
- Local testing may not fully replicate all host-specific behaviors
- Setup involves configuring MCP servers and protocol message routing
Frequently asked questions about sunpeak
What is sunpeak and what does it do?
sunpeak is an open-source framework for building, testing, and deploying MCP Apps, ChatGPT Apps, and Claude Connectors. It provides tools for local development, inspection, and automated testing without requiring paid host accounts.
Who is sunpeak designed for?
sunpeak is designed for developers creating chat-based applications that leverage large language models, particularly those working with MCP, ChatGPT, or Claude platforms. It suits teams focused on rapid prototyping and reliable deployment.
How does sunpeak handle testing of MCP Apps?
sunpeak includes a testing framework with Playwright for E2E tests, live tests against real hosts, and visual regression testing. It provides fixtures for simulating host environments and runs in CI/CD pipelines without paid accounts.
Can sunpeak be used without a paid ChatGPT or Claude account?
Yes, sunpeak enables local development, testing, and inspection without requiring paid host accounts or AI credits. It replicates host runtimes locally for accurate testing.
What integrations does sunpeak support?
sunpeak supports MCP servers in multiple languages (Python, Go, TypeScript, Rust, Java) and integrates with Vitest and Playwright for testing. It also provides CLI tools for project scaffolding and deployment.
How do I get started with sunpeak?
Start by installing the CLI tool with 'npx sunpeak new' to scaffold a project. Use 'npx sunpeak inspect' to launch the local inspector and 'npx sunpeak test' to run automated tests. Documentation provides step-by-step guides for setup.
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