chore(release/candidate): release 2.3.0

[adk-bot]

🤖 I have created a release beep boop

2.3.0 (2026-06-17)

Features

• Add async and concurrency guidelines to ADK Style Guide (66e00db)
• add create_http_options to ContextCacheConfig for cache creation timeout (ffc9677), closes #4703
• add GCS first party toolset to ADK integrations (fb19e1a)
• Add log_level option for adk run CLI (1ac69a9)
• Add mTLS support in AgentRegistry client (03671c6)
• add request timeout to load_web_page (792775f)
• core: migrate core and CLI to enterprise parameters (68221f0)
• Create GEPARootAgentOptimizer (654145a)
• eval: expose user_simulator_config in generate_responses (e7a673c)
• gemma4: support Gemma4 in Gemini (573f043)
• integrations: Add E2BEnvironment for remote sandbox workspaces (92d608f)
• labs: add experimental Antigravity SDK agent wrapper (4cb27fd)
• lazily initialize the Vertex AI client in GCPSkillRegistry, and fix the import path for vertexai (65dca53)
• live: Handle input transcription differently for Gemini Live 3.1 models (048deea)
• live: support Live API translation config in RunConfig (463040f)
• Migrate McpToolset to AsyncAuthorizedSession for mTLS support (fe497a4)
• plugins: ADK 2.0 minimum producer cut for the BigQuery Agent Analytics plugin (e2676fc)
• report cached token counts for Anthropic and OpenAI models (b15c8a0)
• telemetry: support per-request OpenTelemetry configuration (abcaa08)
• Update gcp_auth client UI to support Remote Agents (57bdecf)
• utils: add GOOGLE_GENAI_USE_ENTERPRISE env var with deprecation fallback (4e85e9c)

Bug Fixes

• a2a: Preserve execution metadata in final events (e90b119)
• a2a: render HITL interrupt when prompt is in a data part (b9e7fca)
• a2a: set final=True for error TaskStatusUpdateEvent in event_converter (5efe53d)
• a2a: suppress part_metadata in Vertex AI mode (065f4ae)
• add a2a as a required dependency for agent_engine deployment (d2ebacb)
• adk: propagate exceptions from run_node in standalone mode (63841c3)
• adk: propagate isolation_scope to prevent history filtering loops (f39d75b)
• agents: await cancelled tasks in _merge_agent_run_pre_3_11 to prevent aclose() RuntimeError (9310ba7)
• api-registry to fetch all services (81b8067), closes #5478
• artifacts: Support nested API names (b99546b)
• auth: handle missing client-credentials scopes safely (a546bcf), closes #5345
• avoid UserWarning in _build_response_log when response has funct… (f022307)
• call to sanitize schema for complex union types (9808451)
• ci: add repository check to prevent workflows from running on forks (90bd38f)
• ci: Resolve missing sqlalchemy error in adk_release_analyzer (107dc38)
• cli: Serialize LiteLlm graph models safely (c1e852f)
• conformance: normalize tool declarations in replay verification (dd97e76)
• Default subagents to chat mode in build_node (ad560ce)
• deps: Require otel google-genai instrumentor >=0.7b1 for genai 2.x (2b8c80c)
• eval: handle failed inference results without invocations (9a6cf60)
• eval: handle unevaluated final response v2 results (5cfef01)
• eval: include function-call events in invocation_events when skip_summarization is set (5b16a86)
• eval: preserve custom eval metadata (780b0ab)
• Extract grounding_metadata from Live API server_content (8a294af)
• Fix silent dead end when conditional routes are unmatched (6af4562)
• Fix typing for create_client in mcp_session_manager (c6546a7)
• fix vertex_ai_session_service crashing when Agent Engine passes full resource names instead of short session IDs (60c55ad)
• flows: terminate invocation at tool-level EUC (883ff98)
• Format files to fix pre-commit failures (395848a)
• Format the files (9670ce2)
• gate pr-triage secrets on same-repository pull_request_target (0d20b7c)
• handle missing agent name in readonly context (a890399)
• improve error message when beautifulsoup4/lxml not installed for load_web_page (d9f189c), closes #4852
• live: history_config rejection on Vertex/Enterprise Live sessions (8f85260)
• live: propagate output token count in live API usage metadata (7e8965d)
• log diagnostics for empty or unparseable rubric auto-rater output (fe56f31), closes #5732
• make DatabaseSessionService visible in API docs (69ecf07), closes #4331
• Mock google.auth.default in test_fast_api.py (a7ceb3f)
• models: pass NOT_GIVEN to Anthropic when no system_instruction (3f505d2), closes #5318
• models: surface error when model returns STOP with empty content (ff95d2f)
• models: surface error when model returns STOP with empty content (423cd28)
• Move google-cloud-parametermanager to optional dependencies (0856093)
• Only send grounding_metadata for 3.1 live at the end of each turn (1f2e59b)
• otel: Handle empty contents in experimental semconv (d611f11)
• planners: allow BuiltInPlanner subclasses to override process_planning_response (f8e9195)
• planners: keep all leading parallel function calls (054da5d)
• plugins: write BigQuery analytics rows when invocation agent is None (bc08f46)
• preserve empty GCS text artifacts (8e2b06d)
• Preserve event details when output is delegated (a5a3f2e)
• preserve function call ids for litellm models (1ad348d), closes #2621
• prevent compaction from orphaning function responses (71b936b)
• prevent ReDoS in code block extraction (910e1c1)
• propagate model_version and other metadata in streaming responses (342b59d)
• remove developer notes from transfer_to_agent docstring (2a0b4e7)
• remove live event buffering in runner (4340208)
• remove the issue/PR analyze and fix agent workflows (9127feb)
• remove the issue/PR triage and fix agent workflows (66730e9)
• Reset retry attempt counter on successful connection (ca8baf1)
• restore GitHub-only changes dropped during v2 bring-over (cb48d01)
• sessions: Further fixes for DatabaseSessionService (f0ec997)
• sessions: honor zero recent events in database service (d9a672e)
• sessions: Prevent MissingGreenlet after append_event with asyncpg (06959b9)
• Set role='model' for request_input event Content (0c6974c)
• skills: enforce utf-8 encoding when materializing skill files on Windows (0cb4c81)
• skip crewai test on ImportError for pytest 9.1 compatibility (4aaf494)
• Stop interpolating release analyzer workflow inputs into shell commands (5a129a4)
• support non-Latin text in InMemoryMemoryService search (be1425b)
• surface MALFORMED_FUNCTION_CALL so on_model_error can recover (2fffcd9)
• tests: skip bash tool tests on Windows (9371f1b)
• tools: dereference draft-07 definitions in MCP tool schemas (c11ac7d)
• tools: handle missing 'request' key in AgentTool.run_async fallb… (8b09c48)
• update model to gemini-3.5-flash in session_state_agent sample (0aca7bf)
• use correct 'content' key in sandbox code executor input files (6262f94)
• utils: Preserve decorated type for @experimental and @working_in_progress (30d1910)
• utils: Preserve decorated type for @experimental and @working_in_progress (1ff0158)
• workflow: Preserve explicit single-turn contents (59f7bdf)
• workflow: Prevent replay divergence hang in sequence barrier (d88192c)
• workflow: Prevent Shared InvocationContext branch mutation (5c46937)
• workflow: Prevent silent drain of routed nodes in wait_for_output (ef8a5de)

Performance Improvements

• flows: skip async-rearrange when no function_responses (70b314b)
• test: Speed up unit test suite via parallelism and dedup (4e4bf84)

Code Refactoring

• Add diversion logic based on the auth provider resource name (d4ba521)
• Implement the auth provider using Agent Identity Credentials service (dc6fbd8)
• Move the IamConnectorCredential service depedency to a seperate file (c423fcd)
• otel: Add pure functions for constructing stable and experimental semconv logs (23c0826)
• Remove unused imports across src (b79096a)
• Separate PR analysis from triage for automation (10e5f07)
• telemetry: change agent and tool execution duration metrics from milliseconds to seconds (623c9bd)

Documentation

• add beginner explanation for single agent example (225fafc)
• add PyPI, Python version, downloads, and docs badges to README (04d278a)
• add unit guides for event.py, request_input.py and update adk-unit-guide skill (7d74a0a)
• add unit guides for task mode (f84a5b5)
• Align Python version to 3.10+ and update README badges (d3c21d7)
• clarify context cache min_tokens gating and 4096-token minimum (8c92cde)
• Fix ADK release analyzer session db saving error (991431f)
• fix formatting in multi-agent sample READMEs (fa82929)
• fix triaging agent sample typo (ef395c7)
• openapi: improve docs for session model (7a11b50)
• remove stale -b v2 flag from clone command in CONTRIBUTING.md (2e28e5d)
• skills: fix broken refs in adk-workflow skill (24a1b26)
• update llms.txt and remove build script (c66dc1d)
• Upgrade ADK release analyzer agent to use gemini-3.1-pro-preview model (d72bb7d)

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