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2.4.0 (2026-06-29)

Features

• add error handling to VertexAiMemoryBankService.search_memory (f3529e9)
• Add mTLS support for DiscoveryEngineSearchTool (8ba0e6a)
• add OpenAI Responses API support in labs (6b831d5), closes #3209
• Add support for reusing an existing SQLAlchemy AsyncEngine in DatabaseSessionService (f4c7e4c)
• add support for session TTL and expiration in Vertex AI session service (49d4441)
• Added Log info when agent run is cancelled and log warning if putting sentinel on queue fails during cleanup avoiding silent error suppression (c84c17a)
• Expose branch property on Context (50c81eb)
• Expose parameter_binding in @node decorator (bfc236d)
• HTTP traces for MCP server requests/errors (4c4f77a)
• interactions: stream thought, media, code-exec and function-result deltas (b2dda6e)
• interactions: surface streamed grounding and final usage metadata (6a50b8d)
• memory: add Vertex AI load_profiles tool (fb2b3af)
• models: Add configuration options to Gemini class (037ec12), closes #3813
• models: surface and recover environment_id from interactions (81f9f2e)
• Pass invocation_id to _setup_invocation_context (73ecf8d)
• refactor ADK CLI server to support nested agents in dev mode and simplify API (35a3e4c)
• sessions: add public prepare_tables() for eager initialization (66221c4)
• skills: inject session state into SKILL.md via adk_inject_state (3afdb08)
• support file_data URI references in GcsArtifactService (43115b2)
• Support provider-prefixed Gemini model IDs (816a87f)
• telemetry: add tool type attribute to tool execution duration (d5e8bc7)
• telemetry: introduce ADK_TELEMETRY_SCHEMA_VERSION_OPT_IN (84bbb35)
• telemetry: specify bucket boundaries for GenAI metrics (abf9258)
• tools: add response_scheduling to control Live function response behavior (7443bfa)
• tools: resolve built-in tools for managed-agent requests (f11d19d)
• tools: Support tuple tool parameters (a57c3e4)
• utils: Add support for nested state access in template injection (94c43a2)

Bug Fixes

• adapt interactions conversion to google-genai 2.9 SDK changes (9f3aeef)
• add module blocklist for YAML agent config code references (6a5be34)
• add parameter validation for sync tools in ADK functions.py (9b9d27d)
• add trailing newline to check_new_py_files.sh (21512ea)
• agents: persist output_key when before_agent_callback short-circuits LlmAgent (0e263f1)
• agents: preserve text streamed before tool calls in output_key (5a0b4af)
• agents: prevent path traversal in AgentTool config_path resolution (171ae9e)
• ApplicationIntegrationTool: implement dynamic mTLS endpoint resolution (37ca6fb)
• apply run_config custom_metadata to user event in node runtime (066fbce)
• artifacts: Preserve .text on GcsArtifactService load (ba51ff2), closes #3157
• Avoid overwriting existing isolation scope in stamp_event_branch_context (798207a)
• catch RecursionError in safe JSON serialization helpers (5515800), closes #5411
• check if transfer target is a sibling agent (fa18d26)
• ci: Restrict GitHub Actions to main/v1 branches and main repository (8c4173e)
• cli: enable interspersed option parsing for cloud_run command (7b049b9)
• cli: Ensure ADK compatibility in agent engine requirements (ea772b9), closes #5966
• cli: respect ignore files in adk deploy commands (ee79e71)
• concatenate list values in deep_merge_dicts during parallel tool call merge (fda2347), closes #5190
• concatenate list values in deep_merge_dicts during parallel tool call merge (1ff84eb), closes #5190
• Enable history_config on Vertex AI now that it is supported (2920145)
• enforce agent-config args denylist when loaded under adk web (e506fa6)
• ensure AgentTool text output when skip_summarization is True (b983fcf), closes #3881
• exclude live HTTP clients from trace serialization (59868ea)
• exit connection cleanly on expected GoAway signal in bidi streaming (4d165ef)
• fingerprint cacheable context prefix (7c7f1e7)
• fix ADK Web update workflow PR ownership and CLA issue (b9646f4)
• Fix branch parsing and unify branch stamping (9e3b43f)
• Fix Code Generation Template Injection via Filenames (e042b8d)
• Fix error swallowing in MCP session context (ccb8138)
• Fix event loop closed and thread leak errors in unit tests (2f2e03b)
• Fix instructions_utils matching invalid nested paths (20ba01c)
• Fix MCP debug client factory compatibility with keyword-only factories (1ad8864)
• Fix regression in instructions_utils placeholder matching (9ecbaed)
• Fix Vertex AI Live API session replay on reconnect / modality switch (c007a87)
• guard against None converter results in RemoteA2aAgent (23ff66e)
• guard against None converter results in RemoteA2aAgent handlers (2e3d717)
• guard user_content assignment against None in EvaluationGenerator (6bc9c9f)
• Handle empty message in LiteLLM response (d3e793f)
• handle Pydantic models in safe_json_serialize for tool tracing (25d666a), closes #4629
• harden ContainerCodeExecutor sandbox by default (0a9ce0f)
• implement dynamic mtls endpoint resolution for parameter manager (62b9700)
• implement dynamic mtls endpoint resolution for secret manager (5d4a13f)
• import App lazily in _resolve_app to fix legacy Runner NameError (7481d07)
• LiteLLM Claude thinking blocks with display: "omitted" were lost (7461863)
• Litellm preserve streamed reasoning deltas in LiteLLM adapter (b9625bf)
• LiteLlm: recognize assistant- prefix as valid OpenAI file ID (ea325c7), closes #5664
• LiteLlm: recognize assistant- prefix as valid OpenAI file ID (796964a)
• live: forward thinking config (71d8c84)
• Make EUC request args JSON-serializable (a181a39)
• map A2A Message.role to correct GenAI content role (fe08a9f)
• mcp: propagate trace context in default streamable HTTP client (431e3c2), closes #4768
• migrate AgentRegistry base URLs from v1alpha to v1 (82432a3)
• models: gate Gemini cache creation on cacheable prefix tokens (1070036)
• N sized sliding window (d00ad67)
• preserve Anthropic thinking blocks and signatures in LiteLLM round-trip (febb250)
• preserve JSON-native types in A2A _serialize_value() (139c700), closes #5183
• prevent VertexAiRagRetrieval from blocking the event loop (5898f37), closes #5033
• propagate Gemini grounding metadata from ModelResponse (c303c62)
• raise ValueError for unsupported MIME types in file_data URI path (42eceb3)
• reconnect on live connection 1011 error (f36d257), closes #5525
• recurse into JSON-native containers in A2A _serialize_value() (c08debc)
• refactor _redact_file_uri_for_log to dynamically extract file ID prefixes (file-, assistant-). This ensures compatibility with both current prefixes and future OpenAI/Azure file ID types. (ea325c7)
• remove unit test with wrong assumption about claude thinking parts (94fcdbb)
• restore auth_token initialization for secret and parameter manager clients (46a2181)
• Rollback instruction util refactoring as its breaking internal customers (59fe9b3)
• sandbox nested persona template rendering in evaluation prompts (30493ba)
• scope single-turn node inputs to workflow branch (8d389e2)
• send correct field names for sandbox input files (2b7e08a)
• sessions: drop unsupported part_metadata before Vertex appendEvent (40a0279), closes #6014
• sessions: strip tzinfo for MariaDB in DatabaseSessionService (2f799d5)
• strip tzinfo from datetime for MySQL in create_session (a012bb7)
• surface error for empty STOP model turn in non-streaming mode (932a9b5), closes #5631
• terminate infinite retry loop in RunSkillScriptTool on SCRIPT_NOT_FOUND (89d9bda), closes #5684
• tools: handle tuple schemas in function parsing fallback (4fa7741)
• update litellm dependency constraint to >=1.84.0 (a912306)
• update mtls_utils import in secret_client.py (0b79f8d)
• use Modality enum for RunConfig.response_modalities (5c8c55a)
• validate local eval path segments (7b87f91)
• Wrap math formulas in math blocks in retry config guide (a40f199)

Performance Improvements

• create SQLite session schema once per service instance (10a2cc5)
• skip event query in DB get_session when num_recent_events is 0 (7e8191a)

Documentation

• Add manual batch mode trigger for ADK Pull Request Triaging workflow (dbd4bb0)
• clarify is_final_response() is a public helper (978be4b), closes #4016
• remove trailing whitespace in dynamic_nodes guide (a7377b4)
• Sort PRs by update time in list_untriaged_pull_requests (8679aa8)
• Streamline open_source_workspace/AGENTS.md (ea2ea73)
• Update ADK Pull Request Triaging Agent workflow to run periodically (b3f278a)
• workflow: Add and update workflow developer guides (e5c7d20)

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