ADK

ADK (Agent Development Kit) is Google's open-source toolkit for building AI agents. It provides a flexible code-first Python framework with native support for Gemini, Claude, GPT, and other LLMs. Key features include: Workflow Runtime for deterministic execution graphs, Task API for structured agent-to-agent delegation, built-in evaluation framework, multi-agent orchestration, human-in-the-loop support, and production deployment via Docker. Perfect for developers who need full control over their agent architectures without vendor lock-in.