Chrome 156 Introduces WebMCP for In-Browser Tool Calling by AI Agents

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WebMCP is a new standard, developed by the W3C Web Machine Learning Community Group and Chromium engineers, that lets web pages expose typed JavaScript functions directly to browser agents. It addresses limitations of two existing approaches: DOM-scraping and vision-based agents, which are costly and fragile, and remote MCP servers, which cannot access a user's active session or page state. The feature is exposed through a document.modelContext interface and is currently available in Chrome 156 behind an Origin Trial and a flag. Because it runs in the page's own JavaScript environment, WebMCP can use live DOM state, client storage, and ambient session credentials under existing same-origin and permissions protections. The article is the first part of a series on WebMCP and browser agent security.

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Free Chrome Extensions That Reveal Pinterest Pin Stats, Compared

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Styx Makes Costly File Tracking Opt-In, Switchable From the Review Screen

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