WebMCP Lets Websites Expose Structured Tools for AI Agents to Use Directly

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WebMCP is an emerging Chrome origin-trial technology that allows websites to register structured tools — with defined names, inputs, and descriptions — so AI agents can interact with them without reverse-engineering a human-designed interface. Instead of scraping screens or guessing button functions, an agent can discover and invoke a declared tool like bookSlot or checkOrderStatus with typed parameters. The proposal supports both a declarative HTML form-based API and an imperative JavaScript API for more complex actions, with progressive enhancement ensuring pages remain usable for regular browsers and humans. Because WebMCP is not yet a cross-browser standard, developers are advised to treat it as experimental rather than a sole workflow path. Security guidance emphasizes that every tool call should be treated as untrusted input, with server-side authentication, input validation, and confirmation steps for sensitive or irreversible actions.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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