Google just killed the agent framework industry. ADK 2.0: Open-source. Free. Better than $50K enterprise tools. What it does: → Graph-based execution with routing, fan-out/fan-in, loops, retry → Structured agent-to-agent delegation via Task API → State management, dynamic nodes, human-in-the-loop, nested workflows → Interactive CLI (adk run) and Web UI (adk web) for local dev → Multi-turn task mode with single-turn controlled output → Works with Gemini 2.5 Flash, extensions via pip What it replaces: → LangChain orchestration boilerplate → LangGraph state machines → Vertex AI Agent Builder lock-in → Custom agent-to-agent delegation code Define your Agent class with instructions and tools. Compose a Workflow class as a graph. Run it locally with adk run or adk web. No hosted platform. No vendor lock-in. Customer support bots, research agents, multi-agent pipelines - same library. This is what open-source from Google looks like. →