Claude Code v2.1.219 Also Added `strictAllowlist`, a `DirectoryAdded` Hook, and Depth-3 Nested Subagents

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Beyond making Opus 5 the default, the v2.1.219 release notes carry several changes that got less attention: a `sandbox.network.strictAllowlist` setting for tighter network control, a `DirectoryAdded` hook firing after new working directories are registered mid-session, nested subagents now permitted to depth 3 (up from 1), and nested subagent forwarding in stream-json when `--forward-subagent-text` is set. Dynamic workflows now default to a medium size guideline of fewer than 15 agents. The depth-3 change is the big one for anyone building orchestration on top of Claude Code — a coordinator can now spawn workers that spawn their own verifiers.