/**
 * Stable id for the current browser tab.
 *
 * Backed by sessionStorage, so it is unique per tab and survives reloads
 * within that tab. Use it to scope agent context to the tab: pass it to the
 * navigation-state writer (`useAgentRouteState`/`useNavigationState`) and to
 * `AgentSidebar`/`AgentPanel` so a chat reads the screen state of the tab it
 * was sent from, not whichever tab wrote the global key last.
 */
export declare function getBrowserTabId(): string;
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