[BUG] API Error: 400 he request body is not valid JSON

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?

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"The request body is not valid JSON: no low surrogate in string: line 1 column 175409 (char
175408)"},"request_id":"req_011CTf4LuMTYLYTZqNFmV9sQ"}

What Should Happen?

We should be able to give input and claude code should execute it

Error Messages/Logs

Steps to Reproduce

This happens when we give instruction to claude code

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.1

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_