ChatGPT browser pairs annotations with WebMCP for richer agent context

OpenAI's developer account posted that annotations paired with WebMCP give agents more context to act on, pointing to a demonstration of custom annotation controls and suggested prompts for editing scenes and updating expenses in ChatGPT's browser. The post does not spell out how the annotations work.

The site-tools documentation explains the action side: WebMCP lets a website expose tools directly to ChatGPT, using the open page and signed-in session. Each website chooses which tools it provides. The combination therefore depends on a site's integration: contextual controls are meant to direct the request, and exposed tools provide supported ways to carry it out.