[BUG]computer-use MCP server missing from /mcp on eligible setup

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?

Body:
Version: 2.1.91
OS: macOS
Plan: Pro
Auth: claude.ai (first-party, not Bedrock/Vertex)

The computer-use built-in MCP server does not appear in the /mcp
server list, despite meeting all documented requirements:

• macOS ✓
• Claude Code v2.1.85+ ✓ (running 2.1.91)
• Pro plan ✓
• Authenticated via claude.ai ✓
• Interactive session ✓

Per the troubleshooting docs at https://code.claude.com/docs/en/computer-use,
all eligibility criteria are met. Expected: computer-use appears in
the /mcp list as disabled. Actual: it does not appear at all.

What Should Happen?

mcp should allow for selection of computer-use option

Error Messages/Logs

Steps to Reproduce

Last login: Fri Apr 3 16:34:28 on ttys000
(base) markfrank@Markm4mac ~ % claude
▗ ▗ ▖ ▖ Claude Code v2.1.91
Sonnet 4.6 · Claude Pro
▘▘ ▝▝ /Users/markfrank

❯ /mcp

────────────────────────────────────────────────────────────────────────────────
Manage MCP servers
3 servers

claude.ai
❯ claude.ai Gmail · △ needs authentication
claude.ai Google Calendar · △ needs authentication

Built-in MCPs (always available)
computer-use · ◯ disabled

https://code.claude.com/docs/en/mcp for help
↑↓ to navigate · Enter to confirm · Esc to cancel

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.91

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_