[BUG] "Unhandled node type: string" on Bash tool confirmation prompt (regression in 2.1.89)

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

When a Bash tool call containing $() command substitution or backticks is presented in the confirmation prompt, the CLI displays Unhandled node type: string error message.

What Should Happen?

This is a regression — version 2.1.83 correctly displays Command contains $() command substitution, while 2.1.89 shows the error.

Error Messages/Logs

Steps to Reproduce

## Reproduction

Any Bash command with $() triggers this. Minimal example:

result=$(echo hello); echo "$result"

### 2.1.83 (correct behavior)
Bash command

result=$(echo hello); echo "$result"
Echo hello via variable

Command contains $() command substitution

Do you want to proceed?

### 2.1.89 (broken)
Bash command

result=$(echo hello); echo "$result"
Echo hello via variable

Unhandled node type: string

Do you want to proceed?

## Impact

• The error message is cosmetic — selecting "Yes" still executes the command correctly.
• Affects every Bash command containing $() or backticks.
• Confirmed on two separate machines, both running 2.1.89 on Linux.

## Environment

• Affected version: 2.1.89
• Working version: 2.1.83
• OS: Linux (Ubuntu 24.04, kernel 6.8.0-90-generic)
• Node.js: v22

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.83

Claude Code Version

2.1.89

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_