Claude Code v2.1.94: Enhanced Bedrock Support and Improved User Experience

Claude Code v2.1.94 brings Amazon Bedrock support via Mantle, higher default effort levels, and numerous bug fixes for a smoother development experience.

April 8, 2026 • 10 min read • By ClaudeWorld

The Claude Code development team has released version 2.1.94, packed with significant improvements and bug fixes that enhance the overall user experience for power users and developers.

What’s New

Amazon Bedrock Integration

This release introduces support for Amazon Bedrock powered by Mantle. Users can now enable this feature by setting the environment variable CLAUDE_CODE_USE_MANTLE=1, opening up new deployment possibilities for enterprise users.

Enhanced Default Performance

The default effort level has been upgraded from medium to high for API-key, Bedrock/Vertex/Foundry, Team, and Enterprise users. This change means you’ll get more thorough responses by default, though you can still control this behavior using the /effort command.

Improved Slack Integration

Slack MCP send-message tool calls now display a compact Slacked #channel header with clickable channel links, making it easier to track and navigate conversations across different channels.

Plugin System Enhancements

  • Added keep-coding-instructions frontmatter field support for plugin output styles
  • Plugin skills now use the skill’s frontmatter name for invocation instead of directory basename, providing more stable naming across different install methods
  • New hookSpecificOutput.sessionTitle support in UserPromptSubmit hooks for custom session titles

Major Bug Fixes

  • Rate Limiting: Fixed agents appearing stuck after 429 responses with long Retry-After headers
  • macOS Authentication: Resolved Console login failures when keychain is locked, with improved error surfacing and claude doctor diagnostics
  • Terminal Rendering: Fixed various display issues including diff repetition, blank pages in long sessions, and hyperlink behavior in tmux
  • Text Handling: Resolved CJK and multibyte text corruption in stream-json input/output
  • VS Code Integration: Reduced cold-open startup time and fixed dropdown menu selection issues

How to Update

To update to Claude Code v2.1.94:

  1. Check your current version with claude --version
  2. Update using your package manager or download the latest version
  3. Restart any active Claude Code sessions
  4. Run claude doctor to verify the installation