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Google releases a multi-agent marathon planner Codelab based on ADK and A2A.

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ME News, April 24 (UTC+8), Google Cloud Tech released a Codelab tutorial on building a multi-agent marathon planner based on the ADK and A2A protocol during the Google Cloud Next 2026 Developer Keynote. The tutorial guides developers to use Google ADK to create a planning system consisting of three agents: Planner, Evaluator, and Simulation Controller, supporting Solo mode (Planner + Evaluator) and Full Team mode (three agents communicate via the A2A protocol). The tutorial covers project initialization steps, including creating a Google Cloud project, enabling Vertex AI and Cloud Run APIs, installing Python dependencies, and configuring environment variables. The system adopts a modular design: the Evaluator uses Vertex AI's EvaluationService to assess plans, the Simulation Controller simulates running training through ADK Skill, and the Planner integrates the A2A protocol. The tutorial also includes a testing section to verify the performance of both modes. Through this tutorial, developers can learn multi-agent system design patterns, A2A protocol implementation, ADK framework usage, and Vertex AI evaluation service integration. (Source: InFoQ)
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