[Release] google/adk-python v2.0.0b1: v2.0.0b1

Google ADK Python v2.0.0-beta.1 marks the transition to Beta phase with significant architectural improvements. Key additions include a full Workflow graph orchestration system with NodeRunner for execution isolation, explicit ReAct loop nodes for agent execution, and Human-in-the-loop resumption capabilities. The release also addresses a critical RCE vulnerability in YAML configuration handling and optimizes performance for single-turn LLM agents.

Key Points

• •Transitioned to Beta phase with updated documentation reflecting project maturity
• •Fixed critical RCE vulnerability in nested YAML configuration parsing
• •Implemented full Workflow(BaseNode) graph orchestration for complex agent workflows
• •Introduced NodeRunner for per-node execution isolation and independent node management
• •Added DefaultNodeScheduler enabling standalone node resume via ctx.run_node()
• •Replaced legacy single agent flows with explicit ReAct loop nodes for clearer agent execution patterns
• •Enabled BaseNode as root in both Runner and CLI for flexible workflow entry points
• •Implemented Human-in-the-loop (HITL) resume via event reconstruction for interactive workflows
• •Added lazy scan deduplication and resume for dynamic nodes to handle variable workflow structures
• •Optimized performance by bypassing Mesh for leaf single-turn LlmAgent instances

Workflow Diagram

Concepts