Claude Code v2.1.133: Effort Hooks, Worktree BaseRef Setting, and Admin Policy Keys
Anthropic
Claude Code v2.1.133 (May 7) adds a worktree.baseRef setting (fresh | head) controlling whether worktrees branch from origin/<default> or local HEAD; sandbox.bwrapPath and sandbox.socatPath managed settings for custom binary locations on Linux/WSL; parentSettingsBehavior admin-tier key for policy merge options; and hooks now receive the active effort level via an effort.level JSON field and $CLAUDE_EFFORT env var.
Why it matters
Effort hooks open a new orchestration dimension — external tools can observe and react to the model's current effort level. The worktree.baseRef setting resolves common confusion in workflows that mix local and remote branch heads.
Importance: 2/5
Release adds effort-level hooks exposing a new orchestration signal; improves enterprise admin policy controls.