Claude Code v2.0.23

What: Added support for an experimental additional protection mode that can be enabled via environment variable.

How to use:

# Enable additional protection for API requests
export CLAUDE_CODE_ADDITIONAL_PROTECTION=true
claude --prompt "your prompt here"

Details:

• When enabled, sets the x-anthropic-additional-protection header on API requests
• This is an experimental security feature that may provide enhanced request validation
• Only affects requests to Anthropic's API (not Bedrock or Vertex)
• Evidence: Added at bU() at line 203031-203032 in the API client initialization function

Improved the session persistence mechanism by adding request queuing and serialization to prevent race conditions when multiple session updates occur simultaneously. The system now uses a Map-based queue (fTQ) to ensure session persistence operations are processed sequentially per session.

Consolidated and optimized module imports throughout the codebase:

• Removed redundant stream module imports
• Reorganized child_process imports to use named imports (execSync, spawn) instead of default imports
• Better alignment with Node.js best practices for ES module imports

• Removed generic import tr from "stream" at line 12593
• Removed generic import j40 from "node:child_process" at line 35801
• Added specific import { PassThrough as ET8 } from "stream" at line 467265
• Added specific import { execSync as IBB, spawn as gO6 } from "node:child_process" at line 247798