OpenAI’s latest Help Center documentation confirms that ChatGPT Sites can act as a hosting layer for MCP tools. Users can ask ChatGPT or Codex to add an MCP server to a new or existing Site and define what its tools can read or change. After the Site owner publishes or republishes the Site, ChatGPT can create an associated plugin. Once installed, the plugin can be invoked from ChatGPT or Codex to read information or update Site-backed state. The practical change is that a Site can serve as a lightweight app, a data interface, and an MCP tool backend reusable across other workflows. Business and Enterprise workspaces can share these plugins with teammates, but recipients still need access to the plugin and underlying Site and must complete their own authorization. OpenAI’s hosting guide says the capability is available to all plans, while the general Sites documentation notes that actual Sites availability depends on plan and rollout.