MCP proxy fails with "No available ports found" error on macOS

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?

Details:

• OS: macOS (Darwin 25.0.0)
• Node.js: v24.10.0
• Claude Code: 0.0.117 (latest)
• Error: MCP proxy cannot find available ports despite minimal port usage
• Commands affected: claude mcp list, claude doctor, any MCP-related

commands

Error message:
Error: No available ports found after 50 random attempts and sequential
fallback
at getAvailablePort (file:///opt/homebrew/lib/node_modules/@apple/claude-c
ode/packages/proxy/dist/server.bundle.js:32306:9)

What Should Happen?

Claude should list available MCPs

Error Messages/Logs

Steps to Reproduce

Run Claude mcp list from terminal

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.20

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_