[BUG] Keep getting context management extra inputs are not permitted

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?

Version: v2.1.116

• Error: 400 context management extra inputs are not permitted
• Happens even after /clear
• Requires ~4 attempts before succeeding

What Should Happen?

Version: v2.1.116

• Error: 400 context management extra inputs are not permitted
• Happens even after /clear
• Requires ~4 attempts before succeeding

Error Messages/Logs

API Error: 400 {"error":{"message":"{\"message\":\"context_management: Extra inputs are not permitted\"}No fallback model group found for original                        
     model_group=claude-sonnet-4-6. Fallbacks=[{'gpt-5.2': ['gpt-5.2-chat']}]. Received Model Group=claude-sonnet-4-6\nAvailable Model Group Fallbacks=None\nError doing the   
     fallback: {\"message\":\"context_management: Extra inputs are not permitted\"}","type":"None","param":"None","code":"400"}}

Steps to Reproduce

Run any command with Claude, and it keeps erroring out with 400

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.116

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_