[BUG] Remote Control causes message sent from mobile app to be repeated many times

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?

The message I sent gets delivered many times to the cli instance

<img width="1508" height="892" alt="Image" src="https://github.com/user-attachments/assets/bb9e0f32-cdfd-456b-87a7-0c5301d12a8c" />

What Should Happen?

It should only ever be delivered once

Error Messages/Logs

N/A

Steps to Reproduce

Happens spuriously. I don't have exact repro steps. Some network instability on either side might be necessary.

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.56 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_