Overview

Claude Code v2.1.42 introduces fast mode for Opus 4.6 along with significant improvements to performance, agent teams functionality, and user experience across 10 releases. The updates focus on making development workflows smoother with better terminal handling, enhanced authentication, and more reliable multi-agent collaboration.

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Changes by Version

v2.1.42

  • Added one-time Opus 4.6 effort callout for eligible users
  • Fixed startup performance by deferring Zod schema construction
  • Fixed prompt cache hit rates by moving date out of system prompt
  • 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 Claude Code session
  • Added Windows ARM64 native binary support
  • Added CLI authentication commands (claude auth login/status/logout)
  • Fixed Agent Teams using wrong model identifier for Bedrock, Vertex, and Foundry customers
  • Fixed MCP tools crash when returning image content during streaming
  • Improved /rename to auto-generate session names from conversation context
  • Fixed file resolution for @-mentions with anchor fragments
  • Fixed FileReadTool blocking on FIFOs, /dev/stdin, and large files

v2.1.39

  • Fixed terminal rendering performance
  • Fixed fatal errors being swallowed instead of displayed
  • Fixed process hanging after session close
  • Fixed character loss at terminal screen boundary

v2.1.38

  • Fixed VS Code terminal scroll-to-top regression
  • Fixed Tab key queueing slash commands instead of autocompleting
  • Fixed bash permission matching for commands using environment variable wrappers
  • Fixed duplicate sessions when resuming in VS Code extension
  • Blocked writes to .claude/skills directory in sandbox mode

v2.1.37

  • Fixed /fast not immediately available after enabling /extra-usage

v2.1.36

  • Added fast mode for Opus 4.6

v2.1.34

  • Fixed crash when agent teams setting changed between renders
  • Fixed sandbox bypass vulnerability for excluded commands with Bash permissions

v2.1.33

  • Fixed agent teammate sessions in tmux to send and receive messages
  • Added TeammateIdle and TaskCompleted hook events for multi-agent workflows
  • Added agent spawning restrictions via Task(agent_type) syntax
  • Added persistent memory support for agents with user/project/local scope
  • Added plugin names to skill descriptions for better discoverability