google/adk-python v1.6.1

Release 1.6.1

on GitHub

1.6.1 (2025-07-09)

Features

• Add A2A support as experimental features f0183a9

  • Install google-adk with a2a extra: pip install google-adk[a2a]
  • Users can serve agents as A2A agent with --a2a option for adk web and
    adk api_server
  • Users can run a remote A2A agent with RemoteA2AAgent class
  • Three A2A agent samples are added:
    • contributing/samples/a2a_basic
    • contributing/samples/a2a_auth
    • contributing/samples/a2a_human_in_loop

• Support agent hot reload.e545e5a
  Users can add --reload_agents flag to adk web and adk api_server command
  to reload agents automatically when new changes are detected.

• Eval features

  • Implement auto rater-based evaluator for responses 75699fb
  • Add Safety evaluator metric 0bd05df
  • Add BaseEvalService declaration and surrounding data models b0d88bf

• Minor features

  • Add custom_metadata to VertexAiSessionService when adding events a021222
  • Support protected write in BigQuery execute_sql tool dc43d51
  • Added clone() method to BaseAgent to allow users to create copies of an agent [d263afd] (d263afd)

Bug Fixes

• Support project-based gemini model path to use enterprise_web_search_tool e33161b
• Use inspect.signature() instead of typing.get_type_hints for examining function signatures4ca77bc
• Replace Event ID generation with UUID4 to prevent SQLite integrity constraint failures e437c7a
• Remove duplicate options from adk deploy 3fa2ea7
• Fix scenario where a user can access another users events given the same session id 362fb3f
• Handle unexpected 'parameters' argument in FunctionTool.run_async 0959b06
• Make sure each partial event has different timestamp 17d6042
• Avoid pydantic.ValidationError when the model stream returns empty final chunk 9b75e24
• Fix google_search_tool.py to support updated Gemini LIVE model naming 77b869f
• Adding detailed information on each metric evaluation 04de3e1
• Converts litellm generate config err 3901fad
• Save output in state via output_key only when the event is authored by current agent 20279d9
• Treat SQLite database update time as UTC for session's last update time 3f621ae
• Raise ValueError when sessionId and userId are incorrect combination(#1653) 4e765ae
• Support API-Key for MCP Tool authentication 045aea9
• Lock LangGraph version to <= 0.4.10 9029b8a
• Update the retry logic of create session polling 3d2f13c

Chores

• Extract mcp client creation logic to a separate method 45d60a1
• Add tests for live streaming configs bf39c00
• Update ResponseEvaluator to use newer version of Eval SDK 62c4a85
• Add util to build our llms.txt and llms-full.txt files a903c54
• Create an example for multi agent live streaming a58cc3d
• Refactor the ADK Triaging Agent to make the code easier to read b6c7b5b

Documentation

• Update the a2a exmaple link in README.md d0fdfb8
• Adds AGENTS.md to provide relevant project context for the Gemini CLI 37108be
• Update CONTRIBUTING.md ffa9b36
• Add adk project overview and architecture 28d0ea8
• Add docstring to clarify that inmemory service are not suitable for production dc414cb
• Update agents.md to include versioning strategy 6a39c85
• Add tenacity into project.toml df141db
• Updating CONTRIBUTING.md with missing extra e153d07