Build-Your-Own WebMCP: Storefront as AI-Agent Endpoint

Step-by-step guide for turning any existing website into an AI-agent-discoverable MCP endpoint using the official `@modelcontextprotocol/sdk`. Ships the exact Vercel Edge / Cloudflare Worker implementation that exposes your Supabase tables as MCP tools, the endpoint URL convention agents look for, the schema.org JSON-LD pairing, A/B testing via PostHog/GrowthBook free tiers, and a working example built on a Next.js + Supabase starter. Zero vendor lock-in, $0/mo ongoing cost. The honest DIY alternative to paid WebMCP platforms.

Discovered on Internal via @thetalkinghedge