Release archive

Claude Code v2.1.51 Release Notes

Claude Code v2.1.51 introduces remote control capabilities, enhanced security fixes, and performance improvements for plugin management and tool execution.

February 24, 2026 • 10 min read • By ClaudeWorld

The latest Claude Code release brings significant enhancements for power users, with a focus on remote development capabilities, security hardening, and performance optimizations.

What’s New

Remote Control for External Builds

The headline feature is the new claude remote-control subcommand, which enables local environment serving for all users. This opens up powerful possibilities for external build integration and remote development workflows.

Enhanced Plugin Management

  • Improved Git Performance: Plugin marketplace git timeout increased from 30s to 120s, with configurable timeout via CLAUDE_CODE_PLUGIN_GIT_TIMEOUT_MS
  • Custom npm Registry Support: Full support for custom npm registries and specific version pinning when installing plugins from npm sources
  • Better Model Display: The /model picker now shows human-readable labels (e.g., “Sonnet 4.5”) instead of raw model IDs, with upgrade hints for newer versions

Performance Optimizations

  • Faster BashTool Execution: Login shell (-l flag) is now skipped by default when shell snapshots are available, eliminating the need for CLAUDE_BASH_NO_LOGIN=true
  • Reduced Context Usage: Tool results larger than 50K characters (down from 100K) are persisted to disk, improving conversation longevity

Security Enhancements

  • Workspace Trust Enforcement: Fixed security issue where statusLine and fileSuggestion hooks could execute without proper workspace trust
  • HTTP Hook Security: Environment variable interpolation in HTTP headers now requires explicit allowedEnvVars configuration
  • Sandboxed HTTP Hooks: HTTP hooks are routed through the sandbox network proxy when sandboxing is enabled

Developer Experience Improvements

  • Enhanced SDK Integration: New environment variables (CLAUDE_CODE_ACCOUNT_UUID, CLAUDE_CODE_USER_EMAIL, CLAUDE_CODE_ORGANIZATION_UUID) eliminate race conditions in telemetry
  • Robust Error Handling: Fixed duplicate control_response message handling and slash command autocomplete crashes

How to Update

To update to Claude Code v2.1.51:

claude-code --version
# Follow your standard update procedure

Review your hook configurations if you use HTTP hooks with environment variable interpolation, as you’ll need to add allowedEnvVars lists.