Build, scaffold, refactor, and troubleshoot ChatGPT Apps SDK applications that combine an MCP server and widget UI. Use when Codex needs to design tools, register UI resources, wire the MCP Apps bridge or ChatGPT compatibility APIs, apply Apps SDK metadata or CSP or domain settings, or produce a docs-aligned project scaffold.
Install
npx skills add openai/plugins --skill build-chatgpt-appnpx skills add openai/plugins --skill build-chatgpt-app -a claude-code -gnpx skills add openai/plugins --skill build-chatgpt-app -a codex -ggemini skills install https://github.com/openai/plugins.git --path plugins/openai-developers/skills/build-chatgpt-appgh skill install openai/plugins build-chatgpt-appgit clone --depth 1 https://github.com/openai/plugins /tmp/openai__plugins
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/openai__plugins/plugins/openai-developers/skills/build-chatgpt-app ~/.claude/skills/build-chatgpt-app # Claude Code
cp -R /tmp/openai__plugins/plugins/openai-developers/skills/build-chatgpt-app ~/.agents/skills/build-chatgpt-app # Codex, Cursor, Gemini CLI, Copilot, OpenCode