OpenAI wires WebMCP into ChatGPT’s browser - a site can hand an agent tools instead of a layout

Announced 25 August 2026. "Site tools" is OpenAI’s implementation of the proposed WebMCP standard: a site declares the actions an agent may call - search a document, edit a file, explore a dashboard, update a cart - instead of leaving the agent to scrape the page and simulate clicks. It runs inside the ChatGPT desktop app’s built-in browser, requires GPT-5.6 Sol or Terra, asks the user before acting and reviews each tool invocation, and is unavailable in Enterprise and Education workspaces. WebMCP remains a W3C draft rather than a ratified standard, and OpenAI paired the launch with a ten-day build challenge.

What it means When agents arrive through declared tools rather than the page, what your site exposes - and what it refuses - becomes a product decision rather than a search one.