Release 1.35.2

1.35.2 (2026-06-17)

Bug Fixes

• remove live event buffering in runner (#6151) (afe4083)

Release 1.35.1

1.35.1 (2026-06-15)

Bug Fixes

• Only send grounding_metadata for 3.1 live at the end of each turn (#6129) (847a259)
• streaming: Ensure final partial=False frame is always yielded (#6096) (6e59c61)

Release 1.35.0

1.35.0 (2026-06-10)

Features

• live: Handle input transcription differently for Gemini Live 3.1 models (#6045) (ecfdaf5)

Bug Fixes

• add missing Gemini imports in base_llm_flow (#5943) (6d027b4)
• flows: Reset reconnect attempts on connection success (#6042) (87abf23)
• models: Default grounding metadata for Gemini 3.1 live (#6018) (fafafb3)
• Support generalized history config injection for Gemini 3.1 Live on Vertex AI (#5999) (aafd97f)

v2.2.0

2.2.0 (2026-06-04)

⚠ BREAKING CHANGES

• agents: LlmAgent default model changed from gemini-2.5-flash to gemini-3-flash-preview (a preview model), ahead of the 2026-10-16 gemini-2.5-flash shutdown. Agents without an explicit model= now run on the new preview default; set model="gemini-2.5-flash" to retain prior behavior. DEFAULT_LIVE_MODEL is unchanged. (ad8b6c7)
• interactions: GenAI SDK v2.0.0 support renames the turn-based helpers in interactions_utils.py (e.g. convert_contents_to_turns → convert_contents_to_steps) and moves from "turns" to "steps" terminology. Update any direct callers. (da1d8f1)

Features

• Add --trigger_sources and ADK service options to cli_deploy_agent_engine (ffa057c)
• add AutoTracingPlugin for OpenTelemetry auto-instrumentation (bc3a4fa)
• add RubricBasedMultiTurnTrajectoryEvaluator (cae2337)
• agents: restore 1.x agent config wiring for backward compatibility (44cd116)
• api_server: Abort runs on client drops to avoid leaks (6a53357)
• BigQuery Agent Analytics reliability fixes (a5fa3da)
• distinguish input-required vs auth-required in A2A conversion (9d139ea)
• emit OTel gen_ai.client.* metrics natively (0bb329b)
• forward custom_metadata from run requests into the run config (460cb8c)
• include thoughts and tool calls in compaction summaries (bdb5582)
• interactions: update ADK to support Google GenAI SDK v2.0.0 (da1d8f1)
• models: Support turn_complete_reason in Live responses to capture safety info (9126acb)
• preserve A2A message metadata field in ADK event (d4d955d)
• raise explicit error for unsupported LiteLlm file attachments (8847f23), closes #5546
• sessions: add get_user_state(app_name, user_id) to BaseSessionService (d029bce)
• Support additional scopes and custom discovery doc in Google API Tools (dc6e293)
• tools: expose httpx_client_factory on RestApiTool and OpenAPIToolset (7eb9b3d)
• tools: Standardize request_input tool for proactive LLM clarification (afb0a64)

Bug Fixes

• a2a: Support to_a2a(Workflow) and reject non-agent root nodes (0478b02)
• accept Azure assistant file ids (b73679e), closes #5664
• add artifacts in each agent's .adk folder (bae5b1a)
• add future annotations import and prefix task models logger (2874874)
• add missing crop helper to data file helper lib (b5181cf), closes #4011
• add PEP 604 union syntax in function tool parameters (551445e)
• add telemetry metric assertions to the test's own agent (b7766ce)
• agents: restore abc.ABC base for BaseAgent and LlmAgent (020386a)
• allow internal builder assistant app name (f6e26cc)
• append trailing newline to runtime-config.json in ADK Web Server (4baccf6)
• auth: omit scope from OAuth2 token requests (6ce4b87)
• block path traversal in Agent Builder file tools (1fa7cda)
• dependencies: clarify missing Vertex AI extra (fde6a2b)
• deps: bump starlette and fastapi to address CVE-2026-48710 (81add39)
• eval: Support include_intermediate_responses_in_final in final_response_match_v2 (8519602), closes #5695
• Event.message honors subclass field (5bebfd4)
• exclude temp: state keys from Firestore session writes (a5db346)
• Fix path traversal in GCS skill extraction (Zip Slip) (2f15c6c)
• flows: preserve transparent config on live session reconnect (5ad1942), closes #5675
• Format the files to fix pre-commit failures (af8bfe0)
• guard peer agent mode access in agent transfer (bb16958), closes #5863
• live: Resolve 1007 error and support Gemini 3.1 Flash Live protocol (e5af12c)
• mcp: Prevent initialization hangs and task group leaks (334ef81), closes #5886
• migration: restrict unpickling of v0 actions blobs (9db48ce)
• models: Prevent grounding metadata loss in Gemini 3.1 (e896c62)
• parse noncanonical litellm tool call arguments (31cc5a1)
• populate user_content in resumed invocations (660bbd4)
• preserve media blocks in ollama content flattening (47ceeba), closes #4975
• runners: fall back to root agent when a resumed call author is not in the tree (a86efa6)
• runners: Preserve state_delta in NodeRunner path (c56bec8)
• sessions: guard None event.actions before reading state_delta (03ef3f6)
• Support generalized history config injection for Gemini 3.1 Live on Vertex AI (61a3933)
• terminate infinite retry loop in LoadSkillResourceTool on RESOURCE_NOT_FOUND (bc45ee6)
• tolerate context-likes without user_content or session in record_agent_invocation (0775da5)
• tools: add skill script dir to sys.path (9296198)
• tools: don't close parent's plugins from AgentTool's sub-Ru...

Release 1.34.2

1.34.2 (2026-06-01)

Bug Fixes

• Fix bug where grounding metadata in Gemini 3.1 live was being silently discarded (9b6b9e9)
• fix input and output transcription finished events for Gemini v3.1 (13763d7)
• tools: Prevent session drop on MCP tool error (1fd406b)

v2.1.0

2.1.0 (2026-05-23)

Features

• Add chart generation and artifact loading to data agent (db06416)
• Add support for creating sandboxes from templates and snapshots (cbd14eb)
• Add user.id to gen_ai.user.message log records for telemetry (eb379be)
• Fix error message telemetry for tool calls (e56c021)
• Preserve transcription event order in conversation trajectory (b3d0759)

Bug Fixes

• ci: Add python-dateutil dependency to stale-bot workflow (84fa984)
• ci: Prevent workflow failures in relocated adk_team samples (55cbc8c)
• ci: Use absolute path for PYTHONPATH in upload docs workflow (85223e6)
• cli: Fix --reload_agents for web (1307f8e)
• cli: Inform user to install optional dependency on missing google.cloud (57d677c)
• convert Union[Pydantic, Pydantic] tool args at runtime (104edc8), closes #5799
• Fix bug where grounding metadata in Gemini 3.1 live was being silently discarded (b9751eb)
• fix input and output transcription finished events for Gemini v3.1 (d17a2a3)
• lazy-import GCS evaluation managers in evals utility (5f91a9d)
• Make google-cloud-storage import lazy in skill utils (416775d)
• resolve circular import caused by llm_request (7e38fc8)
• Resolve circular import in base_tool (92cf192)
• tests: Append trailing newline to JSON test outputs (3329ced)
• tools: Prevent session drop on MCP tool error (933653c)
• update EditFileTool to handle cross-platform line breaks and escape regex characters (1f24553)

v1.34.1

1.34.1 (2026-05-22)

Bug Fixes

• Fix bug where grounding metadata in Gemini 3.1 live was being silently discarded (9b6b9e9)
• fix input and output transcription finished events for Gemini v3.1 (13763d7)
• tools: Prevent session drop on MCP tool error (1fd406b)

v2.0.0

2.0.0 (2026-05-19)

ADK 2.0 General Availability

This release introduces v2.0.0 General Availability (GA) of the Google Agent Development Kit (ADK), establishing production-grade foundations for multi-agent workflows and advanced dynamic agent collaboration.

Core Architecture Highlights

Multi-Agent Workflow Engine

• Flexible Execution Graphs: Establishes a model-agnostic engine for orchestrating non-linear, conditional, and cyclical agent execution patterns.
• Intelligent Task Delegation: Introduces modular workflow abstractions enabling parallel sub-agent workers, nested hierarchical team structures, and resilient dynamic scheduling across complex task execution steps.

Dynamic Agent Collaboration

• Native Inter-Agent Routing: Provides seamless orchestration for inter-agent messaging, control state handoffs, and context variable propagation across collaborative multi-agent flows.

v1.34.0

1.34.0 (2026-05-18)

Features

• a2a: add support for persistent task stores (cd78d87)
• add general support for Gemini Live API in ADK evaluate (790c9be)
• Add mTLS support to Google Cloud Telemetry exporter (cfe8d2c)
• add support for A2aAgentExecutor factory in to_a2a() function (115124c)
• add support for non-ADK produced input-required events (6e53472)
• Added config option to include tool calls/responses in conversation history passed to user simulator (baf7efb)
• ci: add Gemini auto review and invoke workflows (fd8b492)
• Implement GCPSkillRegistry in ADK (88ebd42)
• Implement Skill Registry in ADK (380d261)
• Make Agent Skill description validation more informative (9f38973)
• Simplify data retrieved handling of ask_data_agent tool and ask_data_insights tool (48f1b30)
• Support OAuth PKCE in McpToolset (e7316dc)

Bug Fixes

• agents: fix visibility of output_key state delta in callbacks (0524797)
• anthropic: map negative thinking_budget to adaptive thinking (03b915b)
• auth: persist refreshed OAuth2 credentials to store (218ea76), closes #5329
• auth: remove unneeded OAuth flows (c35a579)
• avoid pre-serializing dict values in Interactions API to prevent double-escaping (85f397d)
• cache: enforce CacheMetadata active-state invariant (76b9f0b)
• cache: handle fingerprint-only metadata in performance analyzer (9c5de58)
• Catch OSError when importing AnthropicLlm (91cb5c6)
• evaluation: handle none config in per_turn_user_simulator_quality (eed9bd3), closes #5677
• fallback to project id if crendetials don't contain quota project (e377cb5)
• Fix missing dynamically loaded tools in SkillToolset during the same invocation (f9097cb)
• live: ensure sub live agent doesn't inherit session resumption handle from parent live agent to avoid interrupting the conversation (8dd9147)
• models: preserve string content in Anthropic tool_result blocks (9a1e75f), closes #5358
• models: preserve tool_use IDs for Anthropic models on session resume (327c45f), closes #5074
• models: treat empty GenerateContentResponse without prompt feedback as successful (0cb9ae9)
• only serialize llm_response to json if it will be included in the trace (1284493)
• Preserve live_session_id in function call handling (07a9a01)
• Prevent compaction of events involved in Human-in-the-Loop interactions (bb2efb6)
• raise eagerly on importing AgentRegistry if a2a-sdk is missing (33cf6cb)
• small: Convert events to the A2A format while respecting user vs agent role (59f7347)
• tools: preserve code_execution_result and executable_code in AgentTool (7e61b51), closes #5481
• tools: Prevent AnyIO CancelScope task boundary violations during MCP session creation failure (4309159)
• Update model name in hello_world agent (192f19d)
• Update model to gemini-3-flash-preview in hello word agent sample (6d89d21)
• Update model to gemini-3-flash-preview in session state agent sample (2d423e8)
• use tool_responses role for gemma4 models in LiteLLM integration (3d07960), closes #5650

Performance Improvements

• lazy-load service registries and split apps.app to cut cold start ~8% (bd062ec)
• models: guard debug log evaluation with isEnabledFor (57d8fc7)
• utils: cache find_context_parameter introspection (ec54bd4)

Code Refactoring

• Make the "a2a_metadata" string a constant that can be depended on by extension developers (0821f2d)

v1.33.0

1.33.0 (2026-05-08)

Features

• add BufferableSessionService (0bc767e)
• apigee: allow injecting credentials into ApigeeLlm (ce578ff)
• Make ADK environment tools truncation limit configurable (83ae405)
• models: add get_function_calls and get_function_responses to LlmResponse (22fae7e)

Bug Fixes

• catch genai.ClientError when sandbox is missing (69fa777), closes #5480
• double append bug (f8b4c59)
• Filter out video events with inline data from being stored in session (88421f8)
• fix fork detection, correct offload limits, and add response logging in BigQuery plugin (9d1bb4b)
• hot reload agents for adk web (740557c)
• Only append skills to system instruction if ListSkillsTool isn't available (01f1fc9)
• prevent state_delta overwrite on function_response-only events (fc27203, 211e2ce), closes #3178
• Raise a clear actionable error when CustomAuthScheme lacks a registered AuthProvider (83f9817)
• should use app_name instead of req.app_name (8286066)
• simulation: Add error message when LlmBackedUserSimulator returns empty response (fb92aad)
• Update expressmode api call to include default api key param (e833995)
• use asyncio.sleep to avoid blocking event loop (3a1eadc)
• Use project and location instead of API key when deploying to agent engine (398f28f)

Code Refactoring

• adjust computation of workflow.steps metric and add new unit tests (03d6208)
• remove input.type and output.type attributes from adk metrics (9559968)