Integrate AgentKit 0.18.1 with native authorization on macOS and iOS, device-local OAuth credentials, V43 configuration persistence, and Assistant authorization prompts.
Add HTTPS callback metadata, keep native callbacks safe across actor boundaries, and distinguish authorization setup failures from cancellation. Extend the external MCP server to negotiate 2025-03-26.
Add host-owned chat creation, model discovery, messaging, reading, and waiting with durable delivery receipts. Keep tool presentation compact, mark agent-authored messages, and prevent edits that would remove tool activity.
Adopt the signed AgentKit 0.16.0 release in the package requirement, resolved revision, and submodule.