[Advent of Agents] Day 20: ADK Agent Harness: Build a Generate-Validate-Refine Pipeline

[abraha...@google.com]

Hi everyone,

Day 20 of Google's Advent of Agents — Season 2 is now live! 🌸

Stop settling for one-shot outputs and start building robust agentic harnesses that validate and refine their own work. Today we use ADK to build a README improvement pipeline that pairs a GitHub-aware writer with a strict critic to ensure documentation quality.

Today's Highlights:

• Orchestrate complex workflows using SequentialAgent and LoopAgent to manage execution order and iterative refinement.
• Integrate the GitHub MCP server to provide agents with secure, read-only access to codebase structure and file contents.
• Deploy your workflow as a REST endpoint via the ADK API server, allowing you to trigger sophisticated agent pipelines from any CLI.

👉 View Day 20 Drop Here

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Happy building!
The Advent of Agents Team

© 2026 Google Cloud · Season 2 · Spring Edition