← Claude Code changelog

Claude Code 2.1.160

This release introduces new safety prompts for changes to shell startup files, Git configurations, and build-tool config files that grant code execution, providing better control over system modifications. A significant improvement for user experience is single-file grep commands now satisfying the read-before-edit check, streamlining common editing workflows. Additionally, this update delivers substantial improvements to background session reliability, including fixes for lost chat history, startup failures, and unresponsiveness on Windows under heavy load, ensuring a more stable and consistent experience for all users, particularly those on Windows and WSL. Performance enhancements for opening inactive background sessions and reduced auto mode classifier latency are also included.

Added

  • Added a prompt before writing to shell startup files (`.zshenv`, `.zlogin`, `.bash_login`) and `~/.config/git/`, which could otherwise lead to unintended command execution

Improved

  • Improved performance of opening recently-inactive background agent sessions in `claude agents`
  • Improved auto mode classifier latency by reducing reasoning on routine actions, lowering the chance of "could not evaluate this action" blocks
  • Improved background-session teardown (`claude rm`/`stop`, idle reap) to send SIGTERM to running shell subprocesses before SIGKILL, so cleanup handlers run

Changed

  • `acceptEdits` mode now prompts before writing build-tool config files that grant code execution (`.npmrc`, `.yarnrc*`, `bunfig.toml`, `.bazelrc`, `.pre-commit-config.yaml`, `.devcontainer/`, etc.)
  • Edit no longer requires a separate Read after viewing a file with `grep`: single-file `grep`/`egrep`/`fgrep` commands now satisfy the read-before-edit check
  • Renamed the dynamic-workflow trigger keyword from `workflow` to `ultracode`. The word "workflow" no longer triggers a run; asking for one in your own words still works. The trigger keyword is highlighted in violet in the prompt input

Fixed

  • Fixed copy-on-select not writing to the Windows clipboard on WSL — now uses PowerShell interop instead of OSC 52, which terminals like MobaXterm don't support
  • Fixed restoring a completed session from `claude agents` dropping chat history and re-running the original prompt
  • Fixed background sessions re-attached after overnight retire losing their conversation and re-running the original prompt
  • Fixed `claude --bg` occasionally failing with "socket missing" when the background daemon was cold-starting on a loaded machine
  • Fixed an issue on Windows where the directory a background session was started in could not be deleted after `claude rm` until the background daemon exited
  • Fixed background agents that resumed work being shown under Completed in the agents list
  • Fixed `claude agents` freezing for several seconds when returning to the session list due to the auto-updater re-checking on every exit
  • Fixed Esc, arrow keys, and typing becoming unresponsive on Windows when attached to a background session or in the agent view while the host is under heavy CPU load
  • Fixed background agents emitting terminal sync-output markers to terminals that don't support them (Apple Terminal, tmux), causing render artifacts when entering a running agent
  • Fixed mouse wheel scrolling prompt history instead of the transcript right after opening a session from the agents list
  • Fixed CJK IME composition appearing at the bottom-left of the screen instead of at the input caret in the `claude agents` view
  • Fixed valid `file:///C:/...` links being rewritten to a broken path on Windows terminals with hyperlink support
  • Fixed voice mode failing to connect when the project directory or branch name contains non-ASCII or special characters
  • Fixed the auto mode unavailability message on third-party providers (Bedrock/Vertex/Foundry) to point to the `CLAUDE_CODE_ENABLE_AUTO_MODE` opt-in instead of incorrectly blaming the model
  • Fixed `/effort ultracode` incorrectly blaming the dynamic workflows setting when the model cannot run xhigh; ultracode is no longer offered on models that do not support it
  • Fixed model-not-found errors suggesting `--model` when running via the SDK or other hosts where the CLI flag doesn't apply
  • Fixed Claude's past replies disappearing from scrollback when resuming a brief mode session with brief mode turned off
  • Fixed vim mode `p` pasting on the line below instead of at the cursor when the register was yanked with `v$`

Removed

  • Removed `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE`; the environment variable is now a no-op
  • Removed the JetBrains plugin install suggestion from startup