[BUG] Cursor shader animations still broken in Ghostty with Claude Code CLI

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?

Custom cursor shader animations do not render when Claude Code CLI is active in Ghostty. This was previously reported in #4873 which was auto-closed by the stale bot despite active user reports confirming the
issue persists.

The cursor shader animation stops entirely when Claude Code is running. A standard block cursor is shown instead.

What Should Happen?

Cursor shader animations should continue working while Claude Code is active

Error Messages/Logs

Steps to Reproduce

1. Configure Ghostty with a custom cursor shader (e.g., from https://github.com/hackr-sh/ghostty-shaders)
2. Open Ghostty and verify cursor animation works normally
3. Launch Claude Code with claude
4. Observe that cursor shader animation stops working

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.74 (Claude Code)

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Other

Additional Information

• This was reported in #4873 and confirmed by multiple users
• That issue was incorrectly auto-closed despite recent human activity (see #16497 about the bot behavior)
• The issue likely relates to how Claude Code handles terminal cursor rendering/escape sequences