[BUG] mcp__ide__getDiagnostics interferes with functional diagnostics tools

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?

I'm using https://github.com/hechtcarmel/jetbrains-index-mcp-plugin. However, recently Claude started using its own mcp__ide__getDiagnostics tool. This tools doesn't work reliably in IntelliJ — requires the relevant file to be opened in the IDE. This tools doesn't come from any MCP server that I have installed, and it doesn't seem like I can disabled it.

What Should Happen?

• Claude doesn't use broken internal tools
• it's possible to disable non-functional internal tools

Error Messages/Logs

Steps to Reproduce

use claude with IntelliJ 2026.1 ide
attempt to get diagnostics for file X while file Y is opened

observed: getting diagnostic fails
expected: there's no attempt to use built-in diagnostics that's broken

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.85

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_