[Advent of Agents] Day 12: Multi-Agent Patterns: Generator-Critic Agent Loop

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abraha...@google.com

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Mar 12, 2026, 1:12:35 PMMar 12
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Hi everyone,

Day 12 of Google's Advent of Agents — Season 2 is now live! 🌸

Stop settling for mediocre first-shot outputs by automating a rigorous review cycle between specialized AI agents. This pattern leverages the ADK LoopAgent to pit a creative Writer against a strict Critic, ensuring every output meets your exact rubrics.

Today's Highlights:

  • Master the Generator-Critic pattern to eliminate hallucinations and formatting errors through automated iteration.
  • Orchestrate sub-agent communication using LoopAgent and dynamic template variables for seamless feedback loops.
  • Implement 'Early Escalation' via tool calls to stop the loop immediately once the Critic approves the draft.

Missed a day? View the full archive here.

Happy building!
The Advent of Agents Team

© 2026 Google Cloud · Season 2 · Spring Edition

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