chore(release/candidate): release 1.27.1

[Jacksunwei]

🤖 I have created a release beep boop

1.27.0 (2026-03-13)

Features

• Add adk optimize command (b18d7a1)
• Add code execution in the sample agent (a86aa8b)
• add Dataplex Catalog search tool to BigQuery ADK (82c2eef)
• Add gcs filesystem support for Skills. It supports skills in text and pdf format, also has some sample agents (6edcb97)
• Add GEPA root agent prompt optimizer (4e3e2cb)
• Add interface between optimization infra and LocalEvalService (7b7ddda)
• Add list_skills_in_dir to skills utils (327b3af)
• add missing token usage span attributes during model usage (77bf325)
• Add param support to Bigtable execute_sql (5702a4b)
• Add RunSkillScriptTool to SkillToolset (636f68f)
• Add streaming support for Anthropic models (5770cd3), closes #3250
• Add support for ADK tools in SkillToolset (44a5e6b)
• Add support for MCP App UI widgets in MCPTool (86db35c)
• Add support for PDF documents in Anthropic LLM (4c8ba74)
• Add support for toolsets to additional_tools field of SkillToolset (066fcec)
• Add UiWidget to EventActions for supporting new experimental UI Widgets feature (530ff06)
• Added tracking headers for ADK CLI command to Agent Engine (3117446)
• auth: Add pluggable support for auth integrations using AuthProviderRegistry within CredentialManager (d004074)
• bigtable: add Bigtable cluster metadata tools (34c560e)
• durable runtime support (07fdd23)
• Enable output schema with tools for LiteLlm models (89df5fc), closes #3969
• Enhance BigQuery plugin schema upgrades and error reporting (bcf38fa)
• Enhance BQ plugin with fork safety, auto views, and trace continuity (80c5a24)
• execute-type param addition in GkeCodeExecutor (9c45166)
• Handle Conflict Errors in BigQuery Agent Analytics Plugin (372c76b)
• Introduce A2A request interceptors in RemoteA2aAgent (6f772d2)
• limit number of user-provided BigQuery job labels and reserve internal prefixes (8c4ff74)
• New implementation of A2aAgentExecutor and A2A-ADK conversion (87ffc55)
• New implementation of RemoteA2aAgent and A2A-ADK conversion (6770e41)
• otel: add gen_ai.tool.definitions to experimental semconv (4dd4d5e)
• otel: add experimental semantic convention and emit gen_ai.client.inference.operation.details event (19718e9)
• runners: pass GetSessionConfig through Runner to session service (eff724a)
• skill: Add BashTool (8a31612)
• Support all types.SchemaUnion as output_schema in LLM Agent (63f450e)
• telemetry: add new gen_ai.agent.version span attribute (ffe97ec)
• telemetry: add new gen_ai.agent.version span attribute (a61ccf3)
• telemetry: capture tool execution error code in OpenTelemetry spans (e0a6c6d)
• tools: add preserve_property_names option to OpenAPIToolset (078b516)
• Update docstring for BigQuery search tool (52b2f27)
• Warn when accessing DEFAULT_SKILL_SYSTEM_INSTRUCTION (35366f4)

Bug Fixes

• Add a script to the sample skills agent (8ad8bc9)
• Add usage field to ModelResponse in LiteLLM tests (245b2b9)
• Allow artifact services to accept dictionary representations of types.Part (b004da5), closes #2886
• Change Mypy workflow trigger to manual dispatch (d0825d8)
• Decode image data from ComputerUse tool response into image blobs (d7cfd8f)
• Expand LiteLLM reasoning extraction to include 'reasoning' field (9468487), closes #3694
• filter non-agent directoris from list_agents() (3b5937f)
• Fix Type Error by initializing user_content as a Content object (2addf6b)
• Handle length finish reason in LiteLLM responses (4c6096b), closes #4482
• In SaveFilesAsArtifactsPlugin, write the artifact delta to state then event actions so that the plugin works with ADK Web UI's artifacts panel (d6f31be)
• Make invocation_context optional in convert_event_to_a2a_message (8e79a12)
• Optimize row-level locking in append_event (d61846f), closes #4655
• Preserve thought_signature in FunctionCall conversions between GenAI and A2A (f9c104f)
• Preserve thought_signature in LiteLLM tool calls (ae565be), closes #4650
• Prevent splitting of SSE events with artifactDelta for function resume requests (6a929af), closes #4487
• Propagate file names during A2A to/from Genai Part conversion (f324fa2)
• Propagate thought from A2A TextPart metadata to GenAI Part (e59929e)
• Re-export DEFAULT_SKILL_SYSTEM_INSTRUCTION to skills and skill/prompt.py to avoid breaking current users (de4dee8)
• Refactor LiteLlm check to avoid ImportError (7b94a76)
• Refactor type string update in Anthropic tool param conversion (ab4b736)
• simulation: handle NoneType generated_content (9d15517)
• Store and retrieve EventCompaction via custom_metadata in Vertex AISessionService (2e434ca), closes #3465
• Support before_tool_callback and after_tool_callback in Live mode (c36a708), closes #4704
• temp-scoped state now visible to subsequent agents in same invocation (2780ae2)
• tools: Handle JSON Schema boolean schemas in Gemini schema conversion (3256a67)
• typo in A2A EXPERIMENTAL warning (eb55eb7)
• Update agent_engine_sandbox_code_executor in ADK (dff4c44)
• update Bigtable query tools to async functions (72f3e7e)
• Update expected UsageMetadataChunk in LiteLLM tests (dd0851a), closes #4680
• update toolbox server and SDK package versions (2e370ea)
• Validate session before streaming instead of eagerly advancing the runner generator (ebbc114)

Code Refactoring

• extract reusable functions from hitl and auth preprocessor (c59afc2)
• Rename base classes and TypeVars in optimization data types (9154ef5)
• use McpTool instead of MCPTool to resolve deprecation warnings (175d638)
• use McpTool instead of MCPTool to resolve deprecation warnings (af1c318)

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