import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
export interface PiSubagentSessionBridge {
    readonly isSubagentSession: () => boolean;
}
declare global {
    var __piSubagentSessionBridgesByRuntime: WeakMap<object, PiSubagentSessionBridge> | undefined;
}
/** Publish child-session identity for co-loaded HEPI extensions. */
export declare function registerPiSubagentSessionBridge(pi: ExtensionAPI): void;