[BUG] API Error 500: Internal server error during MCP browser operations

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: 500
{"type":"error","error":{"type":"a
pi_error","message":"Internal
server error"},"request_id":"req_0
11CXoMeFei3Ryq3MgahH8vk"}

## Environment

• Claude Code CLI
• Model: claude-opus-4-5-20251101
• macOS

What Should Happen?

continue browser operations

Error Messages/Logs

API Error: 500                    
  {"type":"error","error":{"type":"a
  pi_error","message":"Internal     
  server error"},"request_id":"req_0
  11CXoMeFei3Ryq3MgahH8vk"}

Steps to Reproduce

## Steps to Reproduce
Using MCP Playwright tools, error
appears intermittently during
browser operations.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.31 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_