How to give AI agents access to user accounts without exposing OAuth tokens

Nango Agent Sessions enables AI agents to access OAuth-connected services without exposing provider access tokens to the model by storing credentials within Nango and authenticating tool calls through a backend-managed session token. The tutorial demonstrates building a Node.js Gmail inbox assistant that can summarize up to 25 messages from one read-only test mailbox through a custom Nango action, while restricting the agent to that single action and a five-minute session. It explains how to configure Gmail OAuth, deploy custom actions, create narrowly scoped sessions through MCP, use OpenAI function calling to retrieve only email subjects and snippets before producing a summary, and ensure credentials, session objects, and message IDs remain absent from model inputs and logs. Verification tests confirm that explicitly permitted tools work, excluded tools are blocked, and terminated or expired sessions return unauthorized responses. For production use, the approach requires associating user-owned connections with authenticated users, creating task-specific sessions with limited tools and lifetimes, and terminating access when the task or user authorization ends.

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