[BUG] Error text color too dark on dark terminal backgrounds

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description

The error text color used in CLI output (e.g., /sandbox command errors) uses rgb(171, 43, 63) — a dark
burgundy/red that's difficult to read on dark terminal backgrounds.

Example

Running /sandbox when settings are overridden produces:
Error: Sandbox settings are overridden by a higher-priority configuration and cannot be changed locally.

The ANSI escape uses a dark red that has poor contrast against common dark themes (e.g., iTerm2 default
dark, VS Code terminal dark).

Suggestion

Use a brighter red variant (e.g., rgb(255, 85, 85) or rgb(239, 68, 68)) for error messages to improve
readability across both light and dark terminal backgrounds.

Environment

• macOS
• Terminal: dark background theme

<img width="868" height="114" alt="Image" src="https://github.com/user-attachments/assets/955a1792-2c0b-422d-8a8e-974bbf94dcd3" />

What Should Happen?

The red text for errors should be readable in dark mode.

Error Messages/Logs

Steps to Reproduce

Make an error happen

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.107 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Warp

Additional Information

_No response_