"It's well thought out, but the Security model isn't fully resolved. But it's good! Enterprises that start assessing their web estate for agent-readiness now will be ahead of the curve when this hits stable"

Google and Microsoft have shipped an early preview of WebMCP (Web Model Context Protocol) in Chrome 146 Canary. WebMCP exposes a browser API (navigator.modelContext) that lets websites publish structured, callable tools for AI agents via two APIs — a Declarative API for form-like interactions and an Imperative API for richer, JavaScript-driven functions. By letting agents call site-provided functions (e.g., searchProducts) and receive structured JSON, WebMCP promises lower token costs, greater reliability, and faster developer velocity compared with screenshot- and DOM-scraping approaches. The standard is designed for human-in-the-loop workflows, is available behind a Chrome flag, and is being incubated in the W3C with joint Google/Microsoft involvement; broader browser adoption and developer uptake will determine its long-term impact.