Type-Safe Tools
Define tools with Zod schemas for full type safety across your application.
Chapplin
A ChatGPT Apps framework for creating MCP servers with type-safe JSX
What is Chapplin?
Section titled “What is Chapplin?”Chapplin is a ChatGPT Apps framework that allows developers to create MCP servers for OpenAI Apps SDK with type-safe JSX.
JSX-Based UI
Build beautiful UI components using familiar JSX syntax for tool outputs.
Framework Agnostic
Works with Hono, Express, Fastify, and more. Choose your preferred server framework.
Multiple UI Libraries
Support for React, Preact, and Hono JSX for rendering your components.