build-chatgpt-app

Helps developers build ChatGPT Apps that pair an MCP server with an in-chat widget.

Ecosystem: Codex
Skill category: Coding
Creator / organization: OpenAI
Origin: United States

What it is

build-chatgpt-app comes from OpenAI's official plugins repository and is part of the openai-developers plugin for Codex. A ChatGPT App runs inside a ChatGPT conversation and combines an MCP server that provides tools with a widget interface. The Skill requires reading the official docs before writing code. It first classifies the app, for example tool-only, vanilla widget, React widget, or ready for submission. Each tool does one job, starts its description with "Use this when...", and honestly declares whether it is read-only, destructive or reaches the outside world. It prefers starting from official examples and checks the result against a "minimum working repo" list that includes the content security policy (CSP) and domain allowlists.

Who it's for:developers building apps for ChatGPT. If you don't write code, it won't be useful to you.

Before you start: written for Codex and uses OpenAI's documentation tools. Check the repository for license terms.

Based on the project's public documentation. Not tested by AI Inspiration World.