CIMD (Client ID Metadata Documents)

CIMD (Client ID Metadata Documents) is a way for an app to identify itself during login without registering in advance. Instead of signing up with each service first, the app's ID is simply an HTTPS link to a small public document describing it. When a buyer connects the app, the login system fetches that link to confirm who's asking. It's the streamlined alternative to Dynamic Client Registration (DCR), and the Model Context Protocol adopted it (via spec proposal SEP-991) as the preferred default in late 2025.

In plain terms: DCR makes the app fill out paperwork at every door; CIMD lets it show a verifiable ID badge instead.

Why it matters for the ChatGPT funnel

This is the plumbing behind a smooth "Connect" experience. The fewer hoops between a buyer saying yes and your app actually running, the more conversations turn into conversions. CIMD removes a brittle, error-prone step — which is the difference between an app that connects in one tap and one that fails at the threshold.

How drio fits

You don't have to think about any of this. drio handles connector authentication — CIMD, DCR, and authless setups — under the hood, so your app connects cleanly inside ChatGPT and Claude and you can focus on the conversation, not the protocol.