Summary
In August 2026, OpenAI introduced Site tools built on WebMCP, giving ChatGPT agents a way to operate websites through structured tools within the current page and signed-in session rather than scraping the UI. ChatGPT Work and Codex automatically discover the tools a WebMCP-enabled site exposes; millions of Shopify storefronts are already enabled, with Expedia, Instacart, and Target experimenting.
What changed
OpenAI shipped Site tools using the WebMCP standard in ChatGPT's browser. On a WebMCP-enabled site, ChatGPT Work and Codex auto-discover the structured tools the site offers and call them within the live page and the user's signed-in session, replacing interface scraping. OpenAI also launched a 10-day WebMCP Challenge with prizes from Shopify, Google Chrome, Netlify, Cloudflare, Vercel, and Render.
Why it matters
Structured, site-published tools give agents a reliable, permissioned interface to the web, sidestepping brittle scraping and enabling actions inside authenticated sessions, foundational for agentic commerce and task completion. Broad early adoption (Shopify, Expedia, Instacart, Target) and cross-vendor backing suggest WebMCP could become a shared standard for agent-ready websites.
Evidence excerpt
"OpenAI introduces Site tools with WebMCP, giving ChatGPT agents a direct way to work with websites through shared live pages and signed-in sessions"; ChatGPT Work and Codex "can automatically discover the tools that site offers," with millions of Shopify storefronts enabled and Expedia, Instacart and Target experimenting.