Google ADK (Agent Development Kit)

Google ADK (Agent Development Kit) is Google's open-source framework for building, orchestrating, and deploying AI agents. ADK provides a modular, code-first approach to agent development with built-in support for multi-agent architectures, tool integration, and evaluation.

ADK integrates natively with Google's Gemini models and Vertex AI platform while remaining model-agnostic — developers can use any LLM as the agent's reasoning engine. The framework supports complex agent topologies including sequential pipelines, parallel execution, and hierarchical delegation between specialized sub-agents.

Google ADK competes with LangChain, CrewAI, and OpenAI's Agents SDK in the agent orchestration layer, offering Google's perspective on how multi-agent systems should be structured and deployed at scale.