Session Environment Hooks

What: Shell environment can now be customized per session through hook scripts that persist throughout the session lifecycle.

How to use:

# SessionStart hooks can create environment files:
# Hook creates: ~/.claude/session-env/hook-1.sh

# Environment is automatically sourced before each Bash command
# Access the env file path via: $CLAUDE_ENV_FILE

Details:

• Hook scripts stored in ~/.claude/session-env/hook-{N}.sh directories
• Multiple hooks are concatenated and sourced in numerical order
• SessionStart hooks receive CLAUDE_ENV_FILE environment variable pointing to persistent env file
• Environment modifications persist for entire session across all Bash tool executions
• Automatic cleanup of old session environment directories
• Cache invalidation supported for dynamic updates
• Evidence: bNA() at line 72216, Vh1() at line 247855, ia0() at line 454456