Google ADK Python v2.0 GA — Graph-Based Agent Workflows Replace Hierarchical Execution

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Google's Agent Development Kit (ADK) hit v2.0 general availability on May 19, transitioning from a hierarchical agent executor to a graph-based workflow engine. Agents, tools, and functions are now nodes in a workflow graph supporting non-linear, conditional, and cyclical execution patterns. New capabilities include parallel sub-agent workers, nested team structures, and native inter-agent messaging with context propagation — a significant architectural upgrade for multi-agent systems.