[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?

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.1: tool_use ids must be unique"},"request_id":"req_011CXTCxRaPDNqHNnZnGMEUb"}

What Should Happen?

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.1: tool_use ids must be unique"},"request_id":"req_011CXTCxRaPDNqHNnZnGMEUb"}

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.1: tool_use ids must be unique"},"request_id":"req_011CXTCxRaPDNqHNnZnGMEUb"}

Steps to Reproduce

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.1: tool_use ids must be unique"},"request_id":"req_011CXTCxRaPDNqHNnZnGMEUb"}

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Version 1.1.886 (ef5d26)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.5.content.1: tool_use ids must be unique"},"request_id":"req_011CXTCxRaPDNqHNnZnGMEUb"}