Function handleTabSwitch

browse/src/terminal-agent.ts:916–949

(msg: { tabId?: number; url?: string; title?: string })

}

function handleTabSwitch(msg: { tabId?: number; url?: string; title?: string }): void {
  const url = msg.url || '';
  if (!url || url.startsWith('chrome://') || url.startsWith('chrome-extension://')) return;

  const stateDir = path.dirname(STATE_FILE);
  const ctxFile = path.join(stateDir, 'active-tab.json');
  const tmp = path.join(stateDir, `.tmp-tab-${process.pid}`);
  try {
    writeSecureFile(tmp, JSON.stringify({
      tabId: msg.tabId ?? null,
      url,
      title: msg.title ?? '',
    }));
    fs.renameSync(tmp, ctxFile);
  } catch {
    safeUnlink(tmp);
  }

  // Best-effort sync to parent server so its activeTabId tracking matches.
  // No await; this is fire-and-forget.
  if (BROWSE_SERVER_PORT > 0) {
    fetch(`http://127.0.0.1:${BROWSE_SERVER_PORT}/command`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${readBrowseToken()}`,
      },
      body: JSON.stringify({
        command: 'tab',
        args: [String(msg.tabId ?? ''), '--no-focus'],
      }),
    }).catch(() => {});
  }
}

function readBrowseToken(): string {
  try {