Microsoft Developer: MCP auth: Stop registering, Start linking

Dynamic Client Registration made every MCP client mint a fresh client_id with every server it met, a per-server credential tax that quietly breaks down once clients start connecting to servers opportunistically. This talk shows how Client ID Metadata Documents flip the model: your client_id becomes a URL the server fetches on demand, giving you one durable identity that works everywhere, with a live demo of the flow end to end.