This developer's guide to the ChatGPT Apps SDK covers the basic concepts, the role of Model Context Protocol, and how to set up your server.

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OpenAI's ChatGPT Apps SDK enables developers to create visual experiences that integrate into ChatGPT conversations. The SDK relies on Model Context Protocol (MCP) servers that expose tools, return structured data, and provide HTML templates rendered inline. Developers must implement tool listing, tool calling via call_tool, and structured content responses. Each tool should be action-oriented with clear descriptions, and UI templates are registered with specific mime types and metadata for rendering in iframes within the ChatGPT interface.

OpenAI’s Apps SDK: A Developer’s Guide to Getting Started

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The Core Technology: Model Context Protocol (MCP)