WebMCP Checker: Prepare for AI Agent Interactivity
WebMCP (Web Model Context Protocol) is the new W3C standard for AI agent interaction. Glippy checks for declarative tool attributes, imperative API usage, SDK/polyfill detection, and form agent-readiness to help you prepare for the next wave of AI interaction.
What Is WebMCP?
WebMCP (Web Model Context Protocol) is a W3C standard jointly developed by Google and Microsoft that lets websites expose structured tools and capabilities directly to AI agents in the browser. Instead of agents guessing how to interact with your site, WebMCP provides a structured tool contract.
What Glippy Checks
- Declarative attributes -
toolname,tooldescription, andtoolparamdescriptionon forms - Imperative API - Usage of
navigator.modelContext.registerTool() - SDK/polyfill detection - Whether WebMCP libraries are loaded
- Form agent-readiness - How close your forms are to WebMCP compatibility
- Tool quality - Description completeness and parameter documentation
WebMCP vs Anthropic's MCP
They are complementary, not competing. Anthropic's MCP is a backend server-to-server protocol. Google's WebMCP is a frontend browser protocol. A complete agent stack might use both: MCP for backend integrations and WebMCP for browser-based interactions.
Should You Implement WebMCP Now?
WebMCP is in early preview (Chrome 146 Canary) with production readiness expected mid-late 2026. Glippy's Agent Interactivity category has a low weight (0.2x) so it will not significantly impact your score today. However, Glippy's Form Agent-Readiness check shows how close your existing forms already are to WebMCP compatibility.
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