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[BUG] Claude Code for VS Code API Error: 400 messages[1].role must be either 'user' or 'assistant', but got 'system' #63473

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[BUG] Claude Code for VS Code API Error: 400 messages[1].role must be either 'user' or 'assistant', but got 'system'#63473
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api:anthropicarea:idebugSomething isn't workingplatform:vscodeIssue specifically occurs in VS Codeplatform:windowsIssue specifically occurs on Windows
@hswyxj

Description

@hswyxj
hswyxj
opened on May 29, 2026

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

  • Claude Code for VS Code 报错信息 messages[1].role must be either 'user' or
    'assistant', but got 'system'
  • CLI 正常但 VS Code 扩展Claude Code for VS Code报错

What Should Happen?

Claude 应该正常回复信息

Error Messages/Logs



Steps to Reproduce


1.Claude Code for VS Code发送任何信息

2.出现错误:"API Error: 400 messages[1].role must be either 'user' or 'assistant', but got 'system'"


    

  • CLI 正常但 VS Code 扩展Claude Code for VS Code报错
    • 



Claude Model


None


Is this a regression?


Yes, this worked in a previous version


Last Working Version


No response


Claude Code Version


2.1.156


Platform


Anthropic API


Operating System


Windows


Terminal/Shell


Other


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