Claude Code v0.2.40

Interactive Confirmation Prompts

• Added a new ConfirmInput component that provides Y/n prompts for user confirmations
• Supports customizable default choices and keyboard shortcuts (Y/n or y/N)
• Automatically submits on Enter key based on the default choice

Enhanced Shell Prompt Integration (OSC 133)

• Added support for OSC 133 terminal sequences for better shell integration
• New prompt markers automatically inserted to track command execution:
• OSC 133;A - marks prompt start
• OSC 133;B - marks prompt end
• OSC 133;C - marks command start
• OSC 133;D - marks command end
• Includes bracketed paste mode support (OSC ?2026h/l)
• Improves terminal experience with better command boundary detection

Improved Allowed Tools Management

• Redesigned the /approved-tools interface with better visual feedback
• Added confirmation dialogs when deleting allowed tools
• Shows "Press [key] again to exit" hints for better UX
• Improved escape key handling throughout the permission flows

URL Validation for WebFetch

• WebFetch tool now requires URLs to be "provided directly by the user in the current or a previous message"
• Added URL extraction from user messages to maintain a whitelist of allowed URLs
• Prevents potential security issues from arbitrary URL fetching

Custom HTTP Headers Support

• New environment variable ANTHROPIC_CUSTOM_HEADERS for adding custom headers to API requests
• Supports multi-line header definitions with name: value format
• Useful for proxy authentication or custom API configurations

Better Mode Indicators

• Reorganized status bar to show mode indicators more clearly
• Added # to memorize indicator for memory mode
• Improved layout of bash mode and command hints
• Vim INSERT mode indicator now properly hides other hints when active

Enhanced File Writing

• Added tab-to-spaces conversion for better cross-editor compatibility
• Improved file writing with proper encoding handling

• Fixed release notes history (removed duplicate entries for v0.2.27)
• Improved terminal output handling with better escape sequence filtering
• Enhanced error handling in file operations
• Better support for environments without terminal resize events

• Added PassThrough stream support for better data handling
• Improved MCP (Model Context Protocol) configuration parsing
• Enhanced terminal rendering with proper OSC sequence support
• Better memory management for long-running sessions

The codebase shows significant refactoring in several areas:

• Terminal rendering engine now supports prompt markers
• Permission management UI components have been modularized
• Stream handling has been improved with proper Node.js stream imports
• Configuration parsing is more robust with better error handling