[BUG] error: 400

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?

{"type":"error","error":{"type":"invalid_request_error","message":"messages.4: tool_use ids were found without tool_result blocks immediately after: toolu_01LqHj43fmheAteL2PTXoCyL. Each tool_use block must have a corresponding tool_result block in the next message."},"request_id":"req_011CTgUwMrehF5d4zVc6KQTr"}

What Should Happen?

{"type":"error","error":{"type":"invalid_request_error","message":"messages.4: tool_use ids were found without tool_result blocks immediately after: toolu_01LqHj43fmheAteL2PTXoCyL. Each tool_use block must have a corresponding tool_result block in the next message."},"request_id":"req_011CTgUwMrehF5d4zVc6KQTr"}

Error Messages/Logs

Steps to Reproduce

{"type":"error","error":{"type":"invalid_request_error","message":"messages.4: tool_use ids were found without tool_result blocks immediately after: toolu_01LqHj43fmheAteL2PTXoCyL. Each tool_use block must have a corresponding tool_result block in the next message."},"request_id":"req_011CTgUwMrehF5d4zVc6KQTr"}

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.1 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

{"type":"error","error":{"type":"invalid_request_error","message":"messages.4: tool_use ids were found without tool_result blocks immediately after: toolu_01LqHj43fmheAteL2PTXoCyL. Each tool_use block must have a corresponding tool_result block in the next message."},"request_id":"req_011CTgUwMrehF5d4zVc6KQTr"}