WebMCP in Chrome (A 101 Guide)

This article provides a comprehensive introduction to WebMCP (Model Context Protocol) in Chrome, targeting developers and tech enthusiasts. It explains MCP as a standard interface for AI agents to connect with external tools, analogous to a USB-C port. WebMCP extends this concept to the browser, allowing web applications to expose structured tools and data to AI agents, replacing inefficient DOM scraping and vision-based browsing. The guide covers registering tools via navigator.modelContext, batching with provideContext, and unregistering tools, with practical insights for Chrome 149 origin trial users. It emphasizes performance, reliability, and reduced token costs for AI interactions.