AI agents have been using the web like tourists — screenshot, guess, click, hope. OpenAI decided that era is over. Site Tools, now live in the ChatGPT desktop app’s built-in browser, is the official implementation of WebMCP: websites expose structured tools, and ChatGPT or Codex calls them directly. No more simulating a human.
How it works for developers
One JavaScript call: document.modelContext.registerTool() with a name, an input schema, and a handler wired to your existing logic. The agent discovers the tools on page load and uses your authenticated session — search a catalog, edit a dashboard, add to cart. WebMCP is an open standard (Google announced it in May), so you’re not building for one vendor.
Why this is a land grab
Adoption is already real: millions of Shopify stores support it, and Expedia, Instacart, and Target are experimenting. OpenAI is also running a 10-day WebMCP Challenge — $3,000 per winner, with prizes from Shopify, Google Chrome, Netlify, Cloudflare, Vercel, and Render. The play is obvious: use ChatGPT’s distribution to own the agent-web interaction layer before anyone else standardizes it.
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