All agent panels go gray/unresponsive simultaneously — possible extension host crash

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?

While running 4 concurrent Claude Code agent panels in VS Code (3 in one project, 1 in another), all panels simultaneously went gray and became completely unresponsive. No user action triggered it — no clicks, no commands. No error message or notification appeared. The panels could not be recovered and had to be closed.

At the time, VS Code was showing this warning: "LaTeX Workshop is incompatible with 'vscode-pdf'. We compete when opening a PDF file from the sidebar. Please consider disabling either extension." This suggests the extension host may have crashed/restarted due to the conflict between LaTeX Workshop (james-yu.latex-workshop v10.13.1) and vscode-pdf (tomoki1207.pdf v1.2.2), killing all active Claude Code sessions as collateral.

Expected: Agent sessions should survive an extension host restart, or at minimum show an error/notification. Conversation history should be recoverable.

Actual: All 4 panels went gray simultaneously, no warning, no recovery possible.

Environment:

VS Code 1.98+ (Electron 34.3.4)
Claude Code extension: 2.1.83 (win32-x64)
Windows 11 Enterprise 10.0.22631
Other extensions: LaTeX Workshop 10.13.1, vscode-pdf 1.2.2
Steps to reproduce:

Have LaTeX Workshop and vscode-pdf extensions both enabled
Open multiple Claude Code agent panels across projects
The extension host eventually restarts due to the LaTeX/PDF conflict, silently killing all agent sessions

What Should Happen?

Agent sessions should either survive an extension host restart, or at minimum:

Show a clear error notification explaining that sessions were terminated
Allow conversation history to be recovered/resumed after the crash
Not silently fail — the user should never have to guess why all panels went gray

Error Messages/Logs

No error messages or notifications were displayed. The panels silently went gray. The only potentially related message was the VS Code warning: "LaTeX Workshop is incompatible with 'vscode-pdf'. We compete when opening a PDF file from the sidebar."

Steps to Reproduce

1. Install both LaTeX Workshop (james-yu.latex-workshop) and vscode-pdf (tomoki1207.pdf) extensions
2. Open multiple Claude Code agent panels (e.g. 3 in one project, 1 in another)
3. Work normally in the agent panels
4. At some point the extension host restarts (likely triggered by the LaTeX/PDF extension conflict)
5. All Claude Code panels simultaneously go gray and become unresponsive with no error shown

Claude Model: claude-opus-4-6

Is this a regression?: Unknown / Not sure

Last Working Version: (leave blank)

Claude Code Version: 2.1.83

Platform: Claude Pro

Operating System: Windows

Terminal/Shell: VS Code Terminal

Additional Information:

Running 4 concurrent agent panels at the time of the crash. The LaTeX Workshop / vscode-pdf incompatibility warning had appeared earlier in the session. It's possible that the extension host crash is unrelated to the LaTeX conflict, but the timing was suspicious. The core issue is that Claude Code does not handle extension host restarts gracefully — no error, no recovery, no notification.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.83

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Running 4 concurrent agent panels at the time of the crash. The LaTeX Workshop / vscode-pdf incompatibility warning had appeared earlier in the session. It's possible that the extension host crash is unrelated to the LaTeX conflict, but the timing was suspicious. The core issue is that Claude Code does not handle extension host restarts gracefully — no error, no recovery, no notification.