[BUG] Claude Code unable to connect to PyCharm by using the dedicated Plugin or via PyCharm's terminals

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?

The graphical diff viewer (side-by-side comparison window with "Reject"/"Apply" buttons) randomly fails to appear when Claude Code proposes file changes. Instead, the diff is displayed as plain text in the terminal with red/green lines. This issue is intermittent and unpredictable.

Randomly, the diff is displayed as plain text directly in the Claude Code terminal:

• Red lines for deletions (with -), green lines for additions (with +)
• Text prompt: "Do you want to make this edit to filename?"
• No graphical diff viewer opens

No specific trigger identified - happens across different:

• Projects
• Sessions
• Computers
• Plugin versions
• IDE versions

What Should Happen?

Claude Code should consistently open a dedicated diff tab (e.g., [Claude Code] filename.ext) with:

• Side-by-side or unified diff viewer
• Native IDE diff controls ("Highlight words", "Unified viewer", etc.)
• "Reject" and "Apply" buttons at the bottom

As shown in the official plugin page screenshot #1.

Error Messages/Logs

Steps to Reproduce

1. Use Claude Code in JetBrains IDE to request file modifications
2. The issue occurs randomly - sometimes the graphical diff viewer appears, sometimes it doesn't

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.60

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PyCharm terminal

Additional Information

_No response_