At the moment, extension who need access to various resources need to implement their own credential storage, e.g. for storing tokens. For example, the VSTS extension does this, and what we want to implement in the (community-driven) Azure tools for Vscode, also looks like we'd need to it, to avoid having users sign-in into Azure every single session.

What I'd expect, is the platform (Vscode) to provide a unified interface for secure credential service (ideally something that looks like this: https://github.com/Microsoft/vsts-vscode/blob/master/src/credentialstore/credentialstore.ts)