Antigravity SDK 0.1.17

[Improvements] Compaction configuration: Adds CompactionConfig on AgentConfig to govern sliding-window conversation history compaction through an explicit token ceiling dial (token_threshold), deprecating CapabilitiesConfig.compaction_threshold.

[Improvements] Forward-looking budget scope: Adds BudgetScope.FORWARD_LOOKING to BudgetConfig to enforce model call and token budgets across newly resumed execution turns without counting previous historical usage.

[Improvements] Tool output token truncation: Exposes tool_output_truncation_config across agent configurations to cap token output volume initially for run_command executions in localharness.

[Improvements] UsageMetadata arithmetic: Supports standard Python arithmetic protocols on UsageMetadata, enabling scalar multiplications, scaling, and accumulating token counts using built-in sum().

[Improvements] Tool wrapper metadata preservation: Preserves function signature, module name, annotations, and original callable references using __wrapped__ when registering tools with ToolWithSchema.

[Improvements] Interactive REPL policy flattening: Automatically flattens nested policy lists during interactive REPL upgrades so nested command authorization rules correctly upgrade to prompt the user.

[Fixes] Tool call deserialization: Fixed dropped tool arguments during tool call handling when incoming payloads provide structured dictionary arguments rather than serialized JSON strings.

[Fixes] Local step trajectory tracking: Fixed missing provenance metadata by forwarding trajectory_id from incoming tool calls to local connection execution steps.

[Fixes] Dynamic content proto resolution: Fixed an AttributeError when importing struct_converter in external environments missing internal protobuf definitions by resolving descriptor types dynamically at runtime.

[Improvements] Terminal command sandboxing guide: Added getting-started guide and references demonstrating OS-level command sandboxing using RunCommandConfig(enable_sandbox=True) paired with execution policies.