CLAUDE_CODE_DEBUG_REPAINTS

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_DEBUG_REPAINTS is a Claude Code environment variable: Enables debug logging for terminal repaint operations. This release fixes several rendering issues — screen flashing blank after idle, scrollback jumping when collapsed groups finish, ghost characters in height-constrained lists — and this variable likely helped the team diagnose them. Added between v2.1.79 and v2.1.83 and still present in v2.1.294. It is not in the official reference.

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_DEBUG_REPAINTS=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_DEBUG_REPAINTS": "<value>"
  }
}

Release notes that mention it

• Claude Code v2.1.83 — 8 New Environment Variables: Security Hardening and the 40-Fix Mega Release

Related variables

• CLAUDE_CODE_DEBUG_LOG_LEVEL: Set debug logging verbosity level.
• CLAUDE_CODE_DEBUG_LOGS_DIR: Custom directory for debug logs.
• CLAUDE_DEBUG: Enable debug logging.
• DEBUG
• CLAUDE_CODE_YOU_SHOULD_KNOW_DEBUG
• CLAUDE_RUNNER_DEBUG_LOG_PATH
• ANTHROPIC_LOG: SDK internal logging level.
• ANTHROPIC_PROFILE

Frequently asked questions

All variables, searchable: Claude Code environment variables.