WebMCP: Expose Your Website's UI as Structured AI Agent Tools

Google's proposed W3C standard (co-developed with Microsoft) landed in Chrome 149 as a public origin trial. Instead of agents brute-forcing DOM pixel-reading, you annotate HTML forms or define JavaScript functions to expose clean tool interfaces directly to browser AI agents. Two APIs: declarative (annotate existing HTML) and imperative (define typed tool schemas in JS). If you build web apps that users interact with via AI agents, opt into the origin trial now to shape the standard.

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Sources: Chrome for Developers · DEV Community explainer