[Advent of Agents] Day 26: Authentication: End-User Identity Propagation

[abraha...@google.com]

Hi everyone,

Day 26 of Google's Advent of Agents — Season 2 is now live! 🌸

Learn how to empower your agents to securely access user-specific data like Gmail and Calendar through integrated OAuth 2.0 flows. We explore how the ADK automates identity propagation so your agents can act on behalf of real users with explicit consent.

Today's Highlights:

• Master the OAuth 2.0 flow to delegate permissions for private data access within your agent's tools.
• Compare pre-built authenticated tools for Google Workspace with custom FunctionTools for third-party platforms like GitHub and Salesforce.
• Utilize the AuthenticatedFunctionTool wrapper to automate credential detection, consent screens, and token exchanges.

👉 View Day 26 Drop Here

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Happy building!
The Advent of Agents Team

© 2026 Google Cloud · Season 2 · Spring Edition