[BUG] Dev Container Keeps Reconnecting After Claude Cowork Upgrade

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?

Root Cause

Upgrading to the latest Claude Cowork causes the VS Code (Claude Code extension installed) remote server inside the Dev Container to crash, triggering a reconnection loop.
This is a regression introduced by the Cowork update.

<img width="1260" height="1366" alt="Image" src="https://github.com/user-attachments/assets/7e3ad3c2-3ea3-4035-ad9e-92657b6a65b1" />

<img width="1246" height="1360" alt="Image" src="https://github.com/user-attachments/assets/224de1ac-e45f-4f90-8555-110a2f8883e6" />

<img width="1243" height="741" alt="Image" src="https://github.com/user-attachments/assets/2bc02f38-00a6-4459-a7bb-f7d4d779ef30" />

<img width="164" height="338" alt="Image" src="https://github.com/user-attachments/assets/680245cd-b31a-4fea-855a-8dd05b258a51" />

What Should Happen?

Claude Code extension should not force VS Code devcontainer to disconnect!

Error Messages/Logs

Steps to Reproduce

1. Run a devcontainer in VS Code (WSL2, Ubuntu-24.04)
2. Ctrl+Shift+P
3. Select "Claude Code: Open in New Window"
4. Claude Code in new window appears.
5. In couple of seconds VS Code "Reconnect Window shows"
6. Click "Reload Window".
7. Loops back to 5.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.20

Claude Code Version

2.1.44

Platform

Anthropic API

Operating System

Host: Windows 11 Pro
WSL2 - Ubuntu 24.04
Devcontainer - Ubuntu 24.04

Terminal/Shell

VS Code integrated terminal

Additional Information

Devcontainer base image: ubuntu:24.04

devcontainer.json

Dockerfile

# Node.js & TypeScript Development Container
# Base: Ubuntu 24.04 LTS (Noble) with Node.js 22.x

FROM ubuntu:24.04

# Install basic dependencies and Node.js 22.x
RUN apt-get update && apt-get upgrade -y && export DEBIAN_FRONTEND=noninteractive \
  && apt-get -y install --no-install-recommends \
  ca-certificates \
  curl \
  unzip \
  git \
  sudo \
  postgresql-client \
  gnupg2 \
  openssh-client \
  p7zip-full \
  # Zsh and dependencies for Oh My Zsh / Powerlevel10k
  zsh \
  locales \
  fontconfig \
  # Playwright core dependencies
  libxcb-shm0 \
  libx11-xcb1 \
  libx11-6 \
  libxcb1 \
  libxext6 \
  libxrandr2 \
  libxcomposite1 \
  libxcursor1 \
  libxdamage1 \
  libxfixes3 \
  libxi6 \
  libgtk-3-0t64 \
  libpangocairo-1.0-0 \
  libpango-1.0-0 \
  libatk1.0-0t64 \
  libcairo-gobject2 \
  libcairo2 \
  libgdk-pixbuf-2.0-0 \
  libglib2.0-0t64 \
  libxrender1 \
  libasound2t64 \
  libfreetype6 \
  libfontconfig1 \
  libdbus-1-3 \
  libnspr4 \
  libnss3 \
  # Playwright additional dependencies (Webkit, Firefox, Chromium)
  libgtk-4-1 \
  libgraphene-1.0-0 \
  libvulkan1 \
  libatomic1 \
  libxslt1.1 \
  libwoff1 \
  libvpx9 \
  libevent-2.1-7t64 \
  libopus0 \
  libgstreamer1.0-0 \
  libgstreamer-plugins-base1.0-0 \
  libgstreamer-plugins-bad1.0-0 \
  libgstreamer-gl1.0-0 \
  gstreamer1.0-libav \
  gstreamer1.0-plugins-base \
  gstreamer1.0-plugins-good \
  libwebpdemux2 \
  libavif16 \
  libharfbuzz-icu0 \
  libwebpmux3 \
  libenchant-2-2 \
  libsecret-1-0 \
  libhyphen0 \
  libwayland-server0 \
  libmanette-0.2-0 \
  libgbm1 \
  libdrm2 \
  libgles2 \
  libflite1 \
  # X11 and display utilities
  xvfb \
  # Emoji font for Remotion video rendering
  fonts-noto-color-emoji \
  && curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
  && apt-get install -y nodejs \
  && rm -rf /var/lib/apt/lists/*

# Generate locale for Powerlevel10k
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen

# Create non-root user with Zsh as default shell
RUN useradd -m -s /bin/zsh node \
  && usermod -aG sudo node \
  && echo "node ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers.d/node \
  && chmod 0440 /etc/sudoers.d/node

# Switch to node user
USER node

# Install Oh My Zsh
RUN sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)" "" --unattended

# Install Powerlevel10k theme
RUN git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k

# Install useful Oh My Zsh plugins
RUN git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/plugins/zsh-autosuggestions \
  && git clone https://github.com/zsh-users/zsh-syntax-highlighting ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/plugins/zsh-syntax-highlighting \
  && git clone https://github.com/zsh-users/zsh-completions ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/plugins/zsh-completions \
  && git clone https://github.com/zsh-users/zsh-history-substring-search ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/plugins/zsh-history-substring-search

# Install fzf with full shell integration (key bindings, completion, etc.)
RUN git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf \
  && ~/.fzf/install --key-bindings --completion --no-update-rc --no-bash --no-fish

# Copy zsh configuration files from devcontainer config
COPY --chown=node:node config/zsh/.zshrc /home/node/.zshrc
COPY --chown=node:node config/zsh/.p10k.zsh /home/node/.p10k.zsh

# Create Claude Code auth directory (will be volume-mounted, but sets ownership template)
RUN mkdir -p /home/node/.claude && chmod 700 /home/node/.claude

# Install Bun (optional)
RUN curl -fsSL https://bun.sh/install | bash
ENV PATH="/home/node/.bun/bin:${PATH}"

.wslconfig

[wsl2]
# 64GB RAM, 12 processors
memory=54GB
processors=12
swap=14GB