Your AI Agent Needed Gmail, Slack, and GitHub. I Gave It One Login.

How Auth0 Token Vault solved the multi-provider problem for AI agents and the three lessons I'd love to share with the Auth0 team. It started with a dream setup. I was building MCS (Model Context Standard), an open-source Python SDK that lets AI agents interact with services like Gmail, Google Drive, and Slack through a standardized tool interface. The agent doesn't know it's talking to Gmail. It just calls search_emails(query="invoices from last week") and gets results. Authentication should be equally invisible. The agent shouldn't care how it gets a token. It just needs one. Then I found Auth0 Token Vault and immediately understood the promise. The Promise That Hooked Me Before Token Vault, every service my agent needed meant another OAuth client. Gmail? Register a Google OAuth app. GitHub? Another OAuth app. Slack? Another one. Each with its own token refresh logic, its own scopes, its own error handling. Multiply that by every agent deployment. Token Vault flips this. One Auth0 lo