Claude Code 2.1.133

Thursday, 7 May 20263 new10 fixes4 other

AI summary

Written by AI from the official notes. Check them for exact details.

Claude Code 2.1.133 introduces new settings for worktree management and sandbox paths, along with several bug fixes.

Added worktree.baseRef setting for worktree branching options
Introduced sandbox.bwrapPath and sandbox.socatPath for custom binary locations
New parentSettingsBehavior key for SDK managed settings
Hooks can now access active effort level via JSON input and environment variable
Improved memory usage by releasing background workers under pressure

Why it matters: Developers and administrators using Claude Code should review these changes for enhanced functionality and bug resolutions.

Official notes on github.com

Full release notes17 changes

What's changed

Added worktree.baseRef setting (fresh | head) to choose whether --worktree, EnterWorktree, and agent-isolation worktrees branch from origin/ or local HEAD. Note: the default fresh changes EnterWorktree's base back to origin/ (it has been local HEAD since 2.1.128) — set worktree.baseRef: "head" to keep unpushed commits in new worktrees
Added sandbox.bwrapPath and sandbox.socatPath managed settings (Linux/WSL) to specify custom bubblewrap and socat binary locations
Added parentSettingsBehavior admin-tier key ('first-wins' | 'merge') to let admins opt SDK managedSettings (parent tier) into the policy merge
Hooks now receive the active effort level via the effort.level JSON input field and the $CLAUDE_EFFORT environment variable, and Bash tool commands can read $CLAUDE_EFFORT
Improved focus mode behavior
Improved memory usage by releasing warm-spare background workers under memory pressure
Fixed parallel sessions all dead-ending at 401 after a refresh-token race wiped shared credentials
Fixed Edit/Write allow rules scoped to a drive root (C:\) or POSIX / matching incorrectly and always prompting
Fixed an unhandled rejection (ECOMPROMISED) when a history or session-log file lock is compromised by clock skew or slow disk
Fixed pressing Esc during conversation compaction showing a spurious "Error compacting conversation" notification
Fixed HTTP(S)_PROXY / NO_PROXY / mTLS not being respected for the full MCP OAuth flow including discovery, dynamic client registration, token exchange, and token refresh
Fixed Read/Write/Edit being denied on mapped network drives passed via --add-dir / SDK additionalDirectories
Fixed Remote Control stop/interrupt from claude.ai not fully canceling the CLI session the same way local Esc does, causing queued messages to never advance after interrupting a stuck tool or prompt
Fixed /effort in one session unexpectedly changing the effort level of other concurrent sessions, and a related issue where an IDE effort change could be silently dropped
Fixed subagents not discovering project, user, or plugin skills via the Skill tool
claude --help now lists --remote-control alongside --remote-control-session-name-prefix
[VSCode] Fixed claudeCode.claudeProcessWrapper failing with "Unsupported platform" when the extension build doesn't bundle a Claude binary

Full release notes17 changes

What's changed

Added worktree.baseRef setting (fresh | head) to choose whether --worktree, EnterWorktree, and agent-isolation worktrees branch from origin/ or local HEAD. Note: the default fresh changes EnterWorktree's base back to origin/ (it has been local HEAD since 2.1.128) — set worktree.baseRef: "head" to keep unpushed commits in new worktrees
Added sandbox.bwrapPath and sandbox.socatPath managed settings (Linux/WSL) to specify custom bubblewrap and socat binary locations
Added parentSettingsBehavior admin-tier key ('first-wins' | 'merge') to let admins opt SDK managedSettings (parent tier) into the policy merge
Hooks now receive the active effort level via the effort.level JSON input field and the $CLAUDE_EFFORT environment variable, and Bash tool commands can read $CLAUDE_EFFORT
Improved focus mode behavior
Improved memory usage by releasing warm-spare background workers under memory pressure
Fixed parallel sessions all dead-ending at 401 after a refresh-token race wiped shared credentials
Fixed Edit/Write allow rules scoped to a drive root (C:\) or POSIX / matching incorrectly and always prompting
Fixed an unhandled rejection (ECOMPROMISED) when a history or session-log file lock is compromised by clock skew or slow disk
Fixed pressing Esc during conversation compaction showing a spurious "Error compacting conversation" notification
Fixed HTTP(S)_PROXY / NO_PROXY / mTLS not being respected for the full MCP OAuth flow including discovery, dynamic client registration, token exchange, and token refresh
Fixed Read/Write/Edit being denied on mapped network drives passed via --add-dir / SDK additionalDirectories
Fixed Remote Control stop/interrupt from claude.ai not fully canceling the CLI session the same way local Esc does, causing queued messages to never advance after interrupting a stuck tool or prompt
Fixed /effort in one session unexpectedly changing the effort level of other concurrent sessions, and a related issue where an IDE effort change could be silently dropped
Fixed subagents not discovering project, user, or plugin skills via the Skill tool
claude --help now lists --remote-control alongside --remote-control-session-name-prefix
[VSCode] Fixed claudeCode.claudeProcessWrapper failing with "Unsupported platform" when the extension build doesn't bundle a Claude binary