Session hangs/loops when image is sent with no text prompt via Remote Control

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?

RC image-only send (no text) → empty assistant response loops indefinitely
API error: 400 messages: text content blocks must be non-empty, for every next prompt
Error visible on app
Workaround: manual JSONL truncation

What Should Happen?

calude should be able to read the image and react, or react for missing text any way not hang

Error Messages/Logs

API Error: 400 messages: text content blocks must be non-empty

Steps to Reproduce

just prompt (paste from clipboard) for a screenshot and send, with no text.

next responses will be API error 400, session is hang

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.7196.0 (2dbd78) 2026-05-12T05:34:40.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_