OpenAI ships MCP Extensions for ChatGPT and Codex plugin UI
OpenAI’s MCP Extensions let plugins hook into ChatGPT surfaces—sidebar apps, conversation panels, file viewers/editors, composer mentions, deep links, and rich forms—via TypeScript/Python SDKs; Bits & Bolts is the kitchen-sink demo, with Canva, Figma, and Adobe already shipping examples. Web extensions are coming soon to Free/Go; composer mentions stay desktop-only.