1.9.0 (2025-07-31)

Features

• [CLI] Add -v, --verbose flag to enable DEBUG logging as a shortcut for --log_level DEBUG (3be0882)
• [CLI] Add a CLI option to update an agent engine instance (206a132)
• [CLI] Modularize fast_api.py to allow simpler construction of API Server (bfc203a, dfc25c1, e176f03)
• [CLI] Refactor AgentLoader into base class and add InMemory impl alongside existing filesystem impl (bda3df2)
• [CLI] Respect the .ae_ignore file when deploying to agent engine (f29ab5d)
• [Core] Add new callbacks to handle tool and model errors (00afaaf)
• [Core] Add sample plugin for logging (20537e8)
• [Core] Expose Gemini RetryOptions to client (1639298)
• [Evals] Added an Fast API new endpoint to serve eval metric info (c69dcf8)
• [Evals] Refactored AgentEvaluator and updated it to use LocalEvalService (1355bd6)

Bug Fixes

• Add absolutize_imports option when deploying to agent engine (fbe6a7b)
• Add space to allow adk deploy cloud_run --a2a (70c4616)
• Copy the original function call args before passing it to callback or tools to avoid being modified (3432b22)
• Eval module not found exception string (7206e0a)
• Fix incorrect token count mapping in telemetry (c8f8b4a)
• Import cli's artifact dependencies directly (282d67f)
• Keep existing header values while merging tracking headers for llm_request.config.http_options in Gemini.generate_content_async (6191412)
• Merge tracking headers even when llm_request.config.http_options is not set in Gemini.generate_content_async (ec8dd57)
• Restore bigquery sample agent to runnable form (16e8419)
• Return session state in list_session API endpoint (314d6a4)
• Runner was expecting Event object instead of Content object when using early exist feature (bf72426)
• Unable to acquire impersonated credentials (9db5d9a)
• Update agent_card_builder to follow grammar rules (9c0721b), closes #2223
• Use correct type for actions parameter in ApplicationIntegrationToolset (ce7253f)

Documentation

• Update documents about the information of vibe coding (0c85587)