Overview

Claude Code v2.1.42 and v2.1.41 bring significant performance improvements and stability fixes. The updates introduce native Windows ARM64 support while resolving critical issues with Agent Teams, MCP tools, and session management across different cloud providers.

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Changes by Version

v2.1.42

  • Added improved startup performance by deferring Zod schema construction
  • Added better prompt cache hit rates by moving date out of system prompt
  • Added one-time Opus 4.6 effort callout for eligible users
  • Fixed /resume showing interrupt messages as session titles
  • Fixed image dimension limit errors to suggest /compact

v2.1.41

  • Added guard against launching Claude Code inside another session to prevent conflicts
  • Added Windows ARM64 (win32-arm64) native binary support
  • Added claude auth login/status/logout CLI subcommands for authentication management
  • Added speed attribute to OTel events for fast mode visibility
  • Fixed Agent Teams using wrong model identifier for Bedrock, Vertex, and Foundry customers
  • Fixed crash when MCP tools return image content during streaming
  • Fixed /resume session previews showing raw XML tags instead of readable command names
  • Fixed plugin browse showing misleading Toggle hint for already-installed plugins
  • Fixed hook blocking errors not showing stderr to the user
  • Improved model error messages for cloud providers with fallback suggestions
  • Improved /rename to auto-generate session names from conversation context when called without arguments
  • Improved narrow terminal layout for prompt footer
  • Fixed file resolution failing for @-mentions with anchor fragments
  • Fixed FileReadTool blocking on FIFOs and large files
  • Fixed background task notifications not being delivered in streaming Agent SDK mode
  • Fixed cursor jumping to end on each keystroke in classifier rule input
  • Fixed markdown link display text being dropped for raw URLs
  • Fixed auto-compact failure error notifications being shown to users
  • Fixed permission wait time being included in subagent elapsed time display
  • Fixed proactive ticks firing while in plan mode
  • Fixed stale permission rules when settings change on disk