← Claude Code changelog

Claude Code 2.1.78

A significant update delivering line-by-line streaming responses for an improved interaction experience. New features include persistent plugin state, advanced agent configuration via frontmatter, and custom model picker options. This release also brings crucial security hardening, such as visible warnings for disabled sandboxes and protected directory permissions, alongside fixes for critical issues like conversation history truncation in large sessions, sandbox pathing, and improved Git integration in sandboxed environments. Users benefit from enhanced stability, security, and a more responsive interface.

Added

  • Added `StopFailure` hook event that fires when the turn ends due to an API error (rate limit, auth failure, etc.)
  • Added `${CLAUDE_PLUGIN_DATA}` variable for plugin persistent state that survives plugin updates; `/plugin uninstall` prompts before deleting it
  • Added `effort`, `maxTurns`, and `disallowedTools` frontmatter support for plugin-shipped agents
  • Added `ANTHROPIC_CUSTOM_MODEL_OPTION` env var to add a custom entry to the `/model` picker, with optional `_NAME` and `_DESCRIPTION` suffixed vars for display

Improved

  • Improved memory usage and startup time when resuming large sessions

Changed

  • Terminal notifications (iTerm2/Kitty/Ghostty popups, progress bar) now reach the outer terminal when running inside tmux with `set -g allow-passthrough on`
  • Response text now streams line-by-line as it's generated

Fixed

  • Fixed `git log HEAD` failing with "ambiguous argument" inside sandboxed Bash on Linux, and stub files polluting `git status` in the working directory
  • Fixed `cc log` and `--resume` silently truncating conversation history on large sessions (>5 MB) that used subagents
  • Fixed infinite loop when API errors triggered stop hooks that re-fed blocking errors to the model
  • Fixed `deny: ["mcp__servername"]` permission rules not removing MCP server tools before sending to the model, allowing it to see and attempt blocked tools
  • Fixed `sandbox.filesystem.allowWrite` not working with absolute paths (previously required `//` prefix)
  • Fixed `/sandbox` Dependencies tab showing Linux prerequisites on macOS instead of macOS-specific info
  • **Security:** Fixed silent sandbox disable when `sandbox.enabled: true` is set but dependencies are missing — now shows a visible startup warning
  • Fixed `.git`, `.claude`, and other protected directories being writable without a prompt in `bypassPermissions` mode
  • Fixed ctrl+u in normal mode scrolling instead of readline kill-line (ctrl+u/ctrl+d half-page scroll moved to transcript mode only)
  • Fixed voice mode modifier-combo push-to-talk keybindings (e.g. ctrl+k) requiring a hold instead of activating immediately
  • Fixed voice mode not working on WSL2 with WSLg (Windows 11); WSL1/Win10 users now get a clear error
  • Fixed `--worktree` flag not loading skills and hooks from the worktree directory
  • Fixed `CLAUDE_CODE_DISABLE_GIT_INSTRUCTIONS` and `includeGitInstructions` setting not suppressing the git status section in the system prompt
  • Fixed Bash tool not finding Homebrew and other PATH-dependent binaries when VS Code is launched from Dock/Spotlight
  • Fixed washed-out Claude orange color in VS Code/Cursor/code-server terminals that don't advertise truecolor support
  • Fixed `ANTHROPIC_BETAS` environment variable being silently ignored when using Haiku models
  • Fixed queued prompts being concatenated without a newline separator
  • Fixed a brief flash of the login screen when opening the sidebar while already authenticated
  • Fixed "API Error: Rate limit reached" when selecting Opus — model dropdown no longer offers 1M context variant to subscribers whose plan tier is unknown