ChatGPT Apps SDK Brings Interactive MCP UIs

The important shift is ChatGPT becoming a host runtime for interactive product experiences, not just a surface for tool calls. The distribution upside is substantial, but developers inherit ChatGPT’s permission model, review process, and platform constraints.

• –MCP servers expose tools, while optional web components render interactive interfaces inside ChatGPT.
• –Open MCP Apps compatibility improves portability across supported hosts and reduces dependence on one client.
• –Backend integration and authentication make richer workflows possible, including premium features and account-aware actions.
• –Enterprise controls add RBAC, action-level permissions, publishing workflows, and confirmation for write operations.
• –Developers must treat custom MCP servers as a security boundary because untrusted integrations can increase prompt-injection risk.