Claude Code v2.1.50: Major Memory Optimizations and Worktree Isolation

Claude Code v2.1.50 brings significant memory leak fixes, worktree isolation support, and enhanced LSP configuration for power users.

February 21, 2026 • 10 min read • By ClaudeWorld

Claude Code v2.1.50 delivers a substantial update focused on performance optimization and developer workflow improvements. This release addresses multiple memory leaks that were affecting long-running sessions and introduces powerful new features for advanced users.

What’s New

Memory Management Overhaul

This release includes comprehensive memory leak fixes that significantly improve performance during extended coding sessions:

  • Fixed memory leaks in agent teams where completed teammate tasks weren’t garbage collected
  • Resolved memory leaks in LSP diagnostic data that caused unbounded growth
  • Fixed task output and state object retention issues
  • Improved memory usage by clearing internal caches and large tool results after processing
  • Added file history snapshot capping to prevent unbounded memory growth

Worktree Isolation Support

A major new feature for advanced Git workflows:

  • Added support for isolation: worktree in agent definitions
  • New WorktreeCreate and WorktreeRemove hook events for custom VCS setup
  • Agents can now run in isolated git worktrees declaratively

Enhanced LSP and Configuration

  • Added startupTimeout configuration for LSP servers
  • Improved startup performance for headless mode by deferring UI imports
  • Fixed native module loading on older glibc systems (RHEL 8 compatibility)

CLAUDE_CODE_SIMPLE Mode Improvements

  • Now fully strips skills, session memory, custom agents, and CLAUDE.md token counting
  • Disables MCP tools, attachments, hooks, and CLAUDE.md loading for minimal experience

Context Window Enhancement

  • Opus 4.6 (fast mode) now includes full 1M context window support
  • Added CLAUDE_CODE_DISABLE_1M_CONTEXT environment variable for opt-out

Additional Improvements

  • New claude agents CLI command to list configured agents
  • Added /extra-usage command support in VS Code sessions
  • Fixed session visibility issues with symlinks
  • Improved session data persistence on SSH disconnect
  • Fixed MCP tool discovery with launch arguments
  • Resolved /mcp reconnect freezing with invalid server names

How to Update

To update to Claude Code v2.1.50:

  1. Via Package Manager: Use your preferred package manager to update
  2. Manual Download: Visit the release page and download the appropriate binary
  3. Verify Installation: Run claude --version to confirm the update

Existing configurations should work seamlessly with this release.