Google Antigravity v0.1.12

0.1.12 August 13, 2026 Fix proto deserialization regression for ActionGenerateImage output paths The 0.1.12 release fixes a client-side proto deserialization regression in image generation result handling. Improvements (0) Fixes (1) ActionGenerateImage Proto Skew : Resolved client-side deserialization errors where the bundled binary emitted ActionGenerateImage.output_path while the shipped Python proto lacked the corresponding field, ensuring robust protobuf parsing across image generation steps. Patches (0) 0.1.11 August 11, 2026 Default Gemini 3.7 Flash upgrade, session budget limits, Vertex AI Express Mode, and autonomous behavior modes The 0.1.11 release updates the default model to gemini-3.7-flash , introduces session-level budget enforcement and turn termination stop reasons, Vertex AI Express Mode authentication, and an autonomous agent behavior setting. It also expands tool hook metadata, resolves string annotation coercion for postponed evaluation, and improves MCP server and subagent stability. Improvements (6) Default Model Upgrade to Gemini 3.7 Flash : Upgraded the default inference model to gemini-3.7-flash . Session Budget Enforcement & Stop Reasons : Added BudgetConfig to define session-level usage limits (total tokens, turns, and cost) and StopReason enum ( BUDGET_EXCEEDED , TURN_LIMIT , USER_CANCELLED , etc.) to inspect turn termination causes. Vertex AI Express Mode Support : Added native support for Express Mode authentication via VertexEndpoint(api_key=...) and LocalAgentConfig(vertex=true, api_key=...) , simplifying headless and non-GCP deployments. Autonomous Agent Behavior Mode : Control the agent's behavior with AgentBehavior . By default the SDK now has an AgentBehavior.AUTONOMOUS mode (previously AgentBehavior.INTERACTIVE ) to streamline scripting, background, and headless interaction modes. Override by setting CapabilitiesConfig(agent_behavior=AgentBehavior.INTERACTIVE) . Multi-Interface Hook Registration : Enabled single-instance registr