Antigravity SDK 0.1.15

[Patches] Deprecated TriggerDelivery Removal: Removed the unused TriggerDelivery enum from types.py.

[Improvements] Subagent-scoped custom tools: Custom tools can now be registered directly on subagents without requiring registration on the root agent, strictly isolating them to the subagent's context and reducing root context tokens.

[Improvements] Context compaction lifecycle hook: Improved support for the on_compaction lifecycle hook to accurately capture compaction events and summaries when long-running conversations trigger checkpointing.

[Improvements] Custom base URL and secure Vertex proxy support: VertexEndpoint now supports routing requests to custom base_url reverse proxies or enterprise gateways without leaking ambient Google Cloud Application Default Credentials (ADC) OAuth tokens or conflicting with project/location configurations.

[Improvements] Universal JSON Schema normalization for custom tools: Custom Python tools now produce standard OpenAPI / JSON Schema compliant parameter definitions with lowercase types and camelCase combiners, eliminating schema errors when connecting to local OpenAI-compatible engines such as Ollama, LM Studio, or vLLM.

[Improvements] Tool call metadata preservation: Preserved id, step_id, and server_name metadata across all ToolResult executions, including batch calls, errors, and unknown tools.

[Improvements] from_bytes Helper Export: Exported the from_bytes helper in top-level google.antigravity alongside from_file for creating binary and multimodal content payloads.

[Improvements] PEP 656 musllinux wheel support: Added musllinux_1_1 wheel platform tags for x86_64 and aarch64 architectures, enabling direct installation using pip on Alpine Linux containers.

[Improvements] Isolated harness environment configuration: Added per-connection environment dictionary resolution for ANTIGRAVITY_HARNESS_PATH, avoiding mutation of global os.environ.

[Improvements] Relative workspace path normalization: LocalAgentConfig(workspaces=...) now resolves relative directory paths and tilde (~) expansions against the current working directory (os.getcwd()).

[Fixes] Local OpenAI tool schema validation: Fixed HTTP 400 "Invalid discriminator value" errors on local OpenAI endpoints by canonicalizing tool parameter schemas to standard JSON Schema.

[Fixes] Vertex custom gateway token leaks: Fixed host GCP OAuth bearer token leakage and environment variable collisions when using custom base_url endpoints with VertexEndpoint.

[Fixes] Subagent custom tool routing: Fixed tool dispatch failures when subagents defined tools not registered on the root agent.

[Fixes] UsageMetadata Service Tier Loss: Fixed UsageMetadata.__sub__ dropping the service_tier field when calculating per-turn usage deltas.

[Fixes] WebSocket deprecation warnings: Resolved DeprecationWarning exceptions when reading WebSocket close codes across varying websockets library versions.

[Fixes] OpenTelemetry optional dependency guard: Fixed test collection failures on minimal environments lacking opentelemetry.sdk.