[BUG]

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 claude code started to cycling and responding with errors

for better search of the issue please use: req_011CYSadDphTReGsbj8zUfeU

What Should Happen?

fix the issue so it will not cause issues and cycling the claude code in the web app

Error Messages/Logs

Steps to Reproduce

1. started session and claude was responding with suggestions.
2. this error re-occured several times and claude code in the web app stopped working.

error: API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.3: tool_use ids must be unique"},"request_id":"req_011CYSadDphTReGsbj8zUfeU"}

1. has to start a new session

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

web app

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_