I built mcp-apps-kit to solve the pain of duplicating code when targeting both Model Context Protocol (MCP) apps (e.g., Claude hosts) and ChatGPT's Apps SDK. Key wins:

Define type-safe tools (Zod) + UI once Direct UI binding to tools via defineUI + ui prop React hooks for dynamic client UIs Unified runtime handles OAuth, state, deployment (Express/serverless)

Quick start: npx @mcp-apps-kit/create-app@latest my-app Repo: https://github.com/AndurilCode/mcp-apps-kit (MIT, v0.4.0 just dropped with better examples) Curious what folks are building with MCP/ChatGPT apps? Happy to answer questions, brainstorm integrations, or hear feedback!