Claude Code v1.0.38

Hook System (New)

• Pre/Post Tool Hooks: Execute custom commands before and after tool operations
• PreToolUse - Run commands before tools execute (e.g., validation, logging)
• PostToolUse - Run commands after tools complete (e.g., notifications, cleanup)
• Stop - Execute commands when Claude stops responding
• Notification - Trigger commands for system notifications
• Hook Configuration: Configure hooks with matchers to target specific tools or patterns
• Support for regex and pipe-separated matchers
• Hooks can approve/block operations or provide feedback
• JSON output parsing for structured hook responses
• 60-second timeout with automatic cancellation

Enhanced Search Tool (Grep)

• New Grep Tool: Powerful search based on ripgrep with advanced features
• Multiple output modes: content, files_with_matches, count
• Context lines support with -A, -B, -C flags
• Line numbers with -n flag
• Case-insensitive search with -i flag
• File type filtering with type parameter
• Glob pattern support for file filtering
• Multiline mode: Search across line boundaries with multiline: true
• Head limit to control output size
• Optimized for correct permissions and file access
• Never invokes grep or rg as bash commands directly

Memory Management

• Enhanced memory system with support for adding memories to specific files
• Memory updates preserve existing content and structure
• Automatic section detection for organized memory storage

️ Terminal Integration

• Ghostty Terminal Support: Added configuration for Shift+Enter keybinding
• Improved terminal setup for multiple environments
• Better handling of paste operations with image detection

️ IDE Detection

• Automatic detection of JetBrains IDEs when launched from within them
• Supports: PyCharm, IntelliJ, WebStorm, PhpStorm, RubyMine, CLion, GoLand, Rider, DataGrip, AppCode, DataSpell, Aqua, Gateway, Fleet

Security & Privacy

• Enhanced API key redaction in logs
• Support for AWS, GCP, and generic API key patterns
• Better handling of authorization tokens and service accounts

Performance & Reliability

• Improved proxy configuration with AWS SDK
• Better handling of aborted operations in hooks
• Enhanced error messages for hook failures
• Optimized file search with modification time sorting

UI/UX Enhancements

• Visual indication when hooks are running
• Better feedback for blocked operations
• Improved diff view for file edits
• Enhanced paste detection with visual feedback

• Updated dependencies and imports
• Improved TypeScript/JavaScript parsing
• Better handling of multiline patterns in search
• Enhanced abort signal propagation
• Optimized memory usage for large file operations

• Fixed duplicate comment issues
• Improved error handling in hook execution
• Better cleanup of resources on exit
• Fixed terminal focus detection issues
• Resolved paste operation edge cases

None - This release maintains backward compatibility with existing configurations and workflows.

New hook configuration example:

// Configure hooks in settings
{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "file_edit|str_replace",
        "hooks": [
          {
            "type": "command",
            "command": "echo 'About to edit a file' | tee -a /tmp/claude.log"
          }
        ]
      }
    ]
  }
}

New Grep tool usage examples:

# Search for function definitions
claude> Search for "function.*Error" in all JavaScript files

# Multiline search for struct definitions
claude> Search for struct definitions with a "field" property using multiline mode

# Count occurrences with context
claude> Count how many times "TODO" appears in the codebase with 2 lines of context