Claude CLI crashes with EOPNOTSUPP when browser bridge socket file exists

Description

Claude CLI crashes on startup when a claude-mcp-browser-bridge-* socket file exists in the temp directory. The CLI tries to fs.watch() the socket file, which fails with EOPNOTSUPP because you cannot watch Unix socket files.

Environment

• macOS 14.x (Darwin 24.6.0)
• Bun v1.3.5
• Claude Code v2.0.76

Steps to Reproduce

1. Use Claude CLI with Chrome integration (--chrome flag or browser extension)
2. This creates a socket file at $TMPDIR/claude-mcp-browser-bridge-$USER
3. Close the Claude session (the socket file remains)
4. Start a new Claude CLI session
5. CLI crashes immediately

Error Output

EOPNOTSUPP: unknown error, watch '/var/folders/xx/.../T/claude-mcp-browser-bridge-username'
     path: "/var/folders/xx/.../T/claude-mcp-browser-bridge-username",
  syscall: "watch",
    errno: -102,
 filename: "/var/folders/xx/.../T/claude-mcp-browser-bridge-username",
     code: "EOPNOTSUPP"

      at new FSWatcher (node:fs:29:31)
      at watch (node:fs:296:10)
      at AC_ (/$bunfs/root/claude:392:6265)
      at PMD (/$bunfs/root/claude:392:11479)
      at _watchWithNodeFs (/$bunfs/root/claude:392:6746)
      at _handleFile (/$bunfs/root/claude:392:7489)
      at _addToNodeFs (/$bunfs/root/claude:392:10516)
Bun v1.3.5 (macOS arm64)

Root Cause

The file at $TMPDIR/claude-mcp-browser-bridge-$USER is a Unix socket (file type s):

srw-------@ 1 user  staff  0 Dec 27 07:49 claude-mcp-browser-bridge-username

fs.watch() does not support watching socket files on macOS, resulting in EOPNOTSUPP.

Workaround

Manually delete the socket file:

rm $TMPDIR/claude-mcp-browser-bridge-$USER

Or programmatically before starting Claude CLI:

// Check for and remove stale browser bridge socket files
const files = readdirSync(tmpdir());
for (const file of files) {
  if (file.startsWith('claude-mcp-browser-bridge-')) {
    const filePath = join(tmpdir(), file);
    const stats = statSync(filePath);
    if (stats.isSocket()) {
      unlinkSync(filePath);
    }
  }
}

Expected Behavior

Claude CLI should handle the case where the browser bridge socket file already exists, either by:

1. Not trying to fs.watch() socket files
2. Cleaning up stale socket files before attempting to watch
3. Gracefully handling the EOPNOTSUPP error