Agent Development Kit (ADK) Files

1.18.0 (2025-11-05)

Features

• [ADK Visual Agent Builder]

• Core Features

  • Visual workflow designer for agent creation
  • Support for multiple agent types (LLM, Sequential, Parallel, Loop, Workflow)
  • Agent tool support with nested agent tools
  • Built-in and custom tool integration
  • Callback management for all ADK callback types (before/after agent, model, tool)
  • Assistant to help you build your agents with natural language
  • Assistant proposes and writes agent configuration yaml files for you
  • Save to test with chat interfaces as normal
  • Build and debug at the same time in adk web!

• [Core]

• Add support for extracting cache-related token counts from LiteLLM usage (4f85e86)
• Expose the Python code run by the code interpreter in the logs (a2c6a8a)
• Add run_debug() helper method for quick agent experimentation (0487eea)
• Allow injecting a custom Runner into agent_to_a2a (156d235)

• Support MCP prompts via the McpInstructionProvider class (88032cf)

• [Models]

• Add model tracking to LiteLlm and introduce a LiteLLM with fallbacks demo (d4c63fc)

• Add ApigeeLlm as a model that lets ADK Agent developers to connect with an Apigee proxy (87dcb3f)

• [Integrations]

• Add example and fix for loading and upgrading old ADK session databases (338c3c8)
• Add support for specifying logging level for adk eval cli command (b1ff85f)
• Propagate LiteLLM finish_reason to LlmResponse for use in callbacks (71aa564)
• Allow LLM request to override the model used in the generate content async method in LiteLLM (ce8f674)
• Add api key argument to Vertex Session and Memory services for Express Mode support (9014a84)
• Added support for enums as arguments for function tools (240ef5b)

• Implement artifact_version related methods in GcsArtifactService (e194ebb)

• [Services]

• Add support for Vertex AI Express Mode when deploying to Agent Engine (d4b2a8b)
• Remove custom polling logic for Vertex AI Session Service since LRO polling is supported in express mode (546c2a6)

• Make VertexAiSessionService fully asynchronous (f7e2a7a)

• [Tools]

• Add Bigquery detect_anomalies tool (9851340)
• Extend Bigquery detect_anomalies tool to support future data anomaly detection (38ea749)

• Add get_job_info tool to BigQuery toolset (6429457)

• [Evals]

• Add "final_session_state" to the EvalCase data model (2274c4f)
• Marked expected_invocation as optional field on evaluator interface (b17c8f1)

• Adds LLM-backed user simulator (54c4ecc)

• [Observability]

• Add BigQueryLoggingPlugin for event logging to BigQuery (b7dbfed)

• [Live]

• Add token usage to live events for bidi streaming (6e5c0eb)

Bug Fixes

• Reduce logging spam for MCP tools without authentication (11571c3)
• Fix typo in several files (d2888a3)
• Disable SetModelResponseTool workaround for Vertex AI Gemini 2+ models (6a94af2)
• Bug when callback_context_invocation_context is missing in GlobalInstructionPlugin (f81ebdb)
• Support models slash prefix in model name extraction (8dff850)
• Do not consider events with state delta and no content as final response (1ee93c8)
• Parameter filtering for CrewAI functions with **kwargs (74a3500)
• Do not treat FinishReason.STOP as error case for LLM responses containing candidates with empty contents (2f72ceb)
• Fixes null check for reflect_retry plugin sample (86f0155)
• Creates evalset directory on evalset create (6c3882f)
• Add ADK_DISABLE_LOAD_DOTENV environment variable that disables automatic loading of .env when running ADK cli, if set to true or 1 (15afbcd)
• Allow tenacity 9.0.0 (ee8acc5)
• Output file uploading to artifact service should handle both base64 encoded and raw bytes (496f8cd)
• Correct message part ordering in A2A history (5eca72f)
• Change instruction insertion to respect tool call/response pairs (1e6a9da)
• DynamicPickleType to support MySQL dialect (fc15c9a)
• Enable usage metadata in LiteLLM streaming (f9569bb)
• Fix issue with MCP tools throwing an error (1a4261a)
• Remove redundant format field from LiteLLM content objects (489c39d)
• Update the contribution analysis tool to use original write mode (54db3d4)
• Fix agent evaluations detailed output rows wrapping issue(4284c61)
• Update dependency version constraints to be based on PyPI versions(0b1784e)

Improvements

• Add Community Repo section to README (432d30a)
• Undo adding MCP tools output schema to FunctionDeclaration (92a7d19)
• Refactor ADK README for clarity and consistency (b0017ae)
• Add support for reversed proxy in adk web (a0df75b)
• Avoid rendering empty columns as part of detailed results rendering of eval results (5cb35db)
• Clear the behavior of disallow_transfer_to_parent (48ddd07)
• Disable the scheduled execution for issue triage workflow (a02f321)
• Include delimiter when matching events from parent nodes in content processor (b8a2b6c)
• Improve Tau-bench ADK colab stability (04dbc42)
• Implement ADK-based agent factory for Tau-bench (c0c67c8)
• Add util to run ADK LLM Agent with simulation environment (87f415a)
• Demonstrate CodeExecutor customization for environment setup (8eeff35)
• Add sample agent for VertexAiCodeExecutor (edfe553)
• Adds a new sample agent that demonstrates how to integrate PostgreSQL databases using the Model Context Protocol (MCP) (45a2168)
• Add example for using ADK with Fast MCP sampling (d3796f9)
• Refactor gepa sample code and clean-up user demo colab(63353b2)