Getting Started with Google ADK: Build a Multi-Agent System from Scratch

Google Cloud NEXT Writing Challenge At Google Cloud NEXT '26, Google announced that 330 of its customers each processed over one trillion tokens in the past 12 months. At the center of it is the Agent Development Kit (ADK), with for Python, TypeScript, Go, and Java. This tutorial is a hands-on first look at ADK from a developer who built with it. You will build a real working weather agent from scratch using a free live weather API, then extend it step by step into a multi-agent system where agents delegate to each other, remember user preferences across turns.