[BUG] The statusline command fails silently if command not executable

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?

Create a script ~/.claude/statusline.sh with any content like the one from the docs:

#!/bin/bash
# Read JSON input from stdin
input=$(cat)

# Extract values using jq
MODEL_DISPLAY=$(echo "$input" | jq -r '.model.display_name')
CURRENT_DIR=$(echo "$input" | jq -r '.workspace.current_dir')

echo "[$MODEL_DISPLAY] 📁 ${CURRENT_DIR##*/}"

and make it NON-executable:

chmod -x ~/.claude/statusline.sh

Points to the script in ~/.claude/settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "~/.claude/statusline.sh",
    "padding": 0
  }
}

Now, when you start claude, it does not show any error and fails silently.

What Should Happen?

Claude should show an error indicating the script is not executable.

Error Messages/Logs

Steps to Reproduce

See above

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.12

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Other

Additional Information

_No response_