ADK 2.0 moves from a rigid hierarchical model to a directed execution graph, supporting both fixed, graph-based workflows and dynamic, code-driven workflows.

Kotlin 1.0 arrived in September, signaling broader language support beyond Python, Go, and TypeScript for Android and the multiplatform ecosystem.

Google released the Agent Development Kit (ADK), an open-source framework designed to build, evaluate, debug, and deploy AI agents and multi-agent systems.

ADK 2.0 adds built-in human-in-the-loop capability, treating human gates as native graph primitives that can halt execution for feedback and resume from a specified checkpoint.

A formal Task API in ADK 2.0 enables structured agent-to-agent delegation using a coordinator-plus-subagents pattern for multi-turn tasks and controlled outputs.

ADK 2.0 is optimized for Gemini models but remains model-agnostic and works with other language models via LiteLLM; officially supports Python and Go for the graph architecture and TypeScript for standard implementations.

Version 2.0 rewrites the internal execution layer, with upgrade cautions due to incompatibilities, including potential data loss when 2.0 code runs against 1.x databases and changes in event schemas.