[BUG] MCP server configuration bug

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?

• MCP server 配置正确（HTTP 类型），URL 可达（curl 返回 405）
• 但会话中工具始终报 No such tool available，MCP 工具未被加载
• 重启会话前工具正常工作过突然断连

What Should Happen?

• MCP server 配置正确（HTTP 类型），URL 可达（curl 返回 405）
• 但会话中工具始终报 No such tool available，MCP 工具未被加载
• 重启会话前工具正常工作过突然断连

Error Messages/Logs

Steps to Reproduce

• MCP server 配置正确（HTTP 类型），URL 可达（curl 返回 405）
• 但会话中工具始终报 No such tool available，MCP 工具未被加载
• 重启会话前工具正常工作过突然断连

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.104、 v2.1.123

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_