Google Antigravity v0.1.9

0.1.9 July 27, 2026 Model-call retry/backoff configuration, LiteRT warm-up scaling, and tool execution error handling Release 0.1.9 of the Google Antigravity Python SDK adds model-call retry/backoff configuration, improves tool registration for custom functions, adds missing BuiltinTools exports, fixes user audio payload processing, and adds connection DebugConfig support along with ToolExecutionError handling. Improvements (5) Model-Call Retry & Backoff Configuration : Exposes configurable retry and backoff parameters in LocalAgentConfig for model calls. LiteRT Warm-up Timeout Scaling : Dynamically scales LiteRT engine warm-up timeouts based on context size and synchronizes warm-up cleanup. Improved Tool Registration : Enhances automatic tool registration and docstring parsing for custom Python functions. BuiltinTools Typing Exports : Exports BuiltinTools at top-level package and typing boundaries for subagent tool configuration. Connection DebugConfig : Adds base DebugConfig options for enhanced connection debugging and logging. Fixes (2) Audio Payload Processing : Fixes processing for user audio payloads in interactive agent sessions. ToolExecutionError Handling : Introduces ToolExecutionError to SDK error types for explicit tool failure handling. Patches (0) 0.1.8 July 21, 2026 Gemini 3.6 Flash default model, custom subagent instructions, and Pydantic argument coercion Release 0.1.8 of the Google Antigravity Python SDK updates the default text model to Gemini 3.6 Flash, adds support for custom subagent instructions, and implements automatic Pydantic argument coercion for tool calls. It also brings defensive prompt sanitization, configurable tool retries, and comprehensive stability improvements for local agent execution. Improvements (7) Default Model Upgrade to Gemini 3.6 Flash : Upgrades the default generative text model in the Python SDK to gemini-3.6-flash . Pydantic TypeAdapter Tool Argument Coercion : Automatically coerces stringified numbers, booleans, an