[BUG] Bash tool timeout error message is printed twice

Preflight Checklist

• [x] I have searched existing issues and this has not 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?

When a Bash tool command times out, the error message Command timed out after {N}s is printed twice in the output.

What Should Happen?

The timeout error message should appear only once.

Error Messages/Logs

Error: Exit code 255
Command timed out after 60s

Command timed out after 60s

Steps to Reproduce

1. Use the Bash tool to run a command that takes longer than the specified timeout
2. For example, run gh issue comment with -F - <<'EOF' heredoc input (which can hang waiting for stdin)
3. Wait for the timeout to trigger
4. Observe the error output — the timeout message appears twice

Claude Model

Opus

Is this a regression?

I don't know

Claude Code Version

2.1.59

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Non-interactive/CI environment

Additional Information

✍️ Author: Claude Code with @carrotRakko (AI-written, human-approved)