[BUG] Error: Error during compaction: Error: API 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?

I currently have about 176487 tokens used up

I want to compact manually, but when I attempt to do so, I am facing a 400 issue

❯ /compact "keep the api handy, also keep the information that the figr spaces already has the sharing funcitonality implemented in the
frontend side"
⎿ Error: Error during compaction: Error: API Error: 400
{"type":"error","error":{"type":"invalid_request_error","message":"messages.0.content.0: unexpected tool_use_id found in tool_result
blocks: toolu_016ahFC3cNKqGN57sx7pMW1D. Each tool_result block must have a corresponding tool_use block in the previous
message."},"request_id":"req_011CXzFwfgPWcRGSNTDCdxBK"}

❯ /compact
⎿ Error: Error during compaction: Error: API Error: 400
{"type":"error","error":{"type":"invalid_request_error","message":"messages.0.content.0: unexpected tool_use_id found in tool_result
blocks: toolu_016ahFC3cNKqGN57sx7pMW1D. Each tool_result block must have a corresponding tool_use block in the previous
message."},"request_id":"req_011CXzFxJQk6zrTRRbj43iWt"}

these are the prompts

What Should Happen?

Claude should be able to compact without issues in the API

Error Messages/Logs

❯ /compact "keep the api handy, also keep the information that the figr spaces already has the sharing funcitonality implemented in the       
frontend side"                                                                                                                            
  ⎿  Error: Error during compaction: Error: API Error: 400                                                                                    
     {"type":"error","error":{"type":"invalid_request_error","message":"messages.0.content.0: unexpected tool_use_id found in tool_result     
     blocks: toolu_016ahFC3cNKqGN57sx7pMW1D. Each tool_result block must have a corresponding tool_use block in the previous                
     message."},"request_id":"req_011CXzFwfgPWcRGSNTDCdxBK"}                                                                                  
                                                                                                                                              
❯ /compact                                                                                                                                    
  ⎿  Error: Error during compaction: Error: API Error: 400                                                                                    
     {"type":"error","error":{"type":"invalid_request_error","message":"messages.0.content.0: unexpected tool_use_id found in tool_result     
     blocks: toolu_016ahFC3cNKqGN57sx7pMW1D. Each tool_result block must have a corresponding tool_use block in the previous                  
     message."},"request_id":"req_011CXzFxJQk6zrTRRbj43iWt"}

Steps to Reproduce

Complete any implementation, use up your context window and try attempting

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.37

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_