WebMCP Checker

Check whether a site advertises WebMCP, the in-page way to expose tools to agents.

Probes /.well-known/webmcp.json. WebMCP is an early W3C Web Machine Learning Community Group proposal for a page to expose callable tools to an agent running in the browser. There is no ratified discovery location, so essentially no site publishes one yet.

This is one of the checks the AI Agent Readiness Checker scores under API, Auth, MCP & Skill Discovery, and it can also be run on its own for any URL.

Experimental · Based on: WebMCP — W3C Web Machine Learning Community Group proposal

About this validation

Experimental / emerging convention

Probes for WebMCP discovery metadata. WebMCP is an early W3C Web Machine Learning Community Group proposal, not a W3C Recommendation, and has no ratified discovery location.

Reference documentation:: WebMCP — W3C Web Machine Learning Community Group proposal(draft, not yet ratified)
Rules reviewed:: Nov 11, 2026

Standards and vendor-documented behavior can change. This reflects the source as last reviewed above, not a permanent guarantee.