Google Releases a Multi-Agent Marathon Planner Codelab Based on ADK and A2A

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ME News: On April 24 (UTC+8), Google Cloud Tech released a Codelab tutorial at the Google Cloud Next 2026 Developer keynote. The tutorial presents a multi-agent marathon planner built based on the ADK and A2A protocols. It guides developers in using Google ADK to create a planning system consisting of three agents: Planner, Evaluator, and Simulation Controller, supporting both Solo mode (Planner + Evaluator) and Full Team mode (the three agents communicate via the A2A protocol). The tutorial covers project initialization steps, including creating a Google Cloud project, enabling the Vertex AI and Cloud Run APIs, installing Python dependencies, configuring environment variables, and more. The system uses a modular design: the Evaluator uses Vertex AI’s EvaluationService to evaluate plans, the Simulation Controller simulates running training via ADK Skill, and the Planner integrates the A2A protocol. The tutorial also includes a test section to verify the performance of both modes. Through this tutorial, developers can learn multi-agent system design patterns, A2A protocol implementation, how to use the ADK framework, and integration with Vertex AI evaluation services. (Source: InFoQ)
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