export interface PendingTaskCall {
    callId: string;
    parentSessionId: string;
    agentType: string;
    label: string;
    resumedTaskId?: string;
}
export declare function createPendingCallTracker(): {
    add(call: PendingTaskCall): void;
    take(callId?: string, parentSessionId?: string): PendingTaskCall | undefined;
    /** Peek oldest pending call for a parent without removing it. */
    peekByParent(parentSessionId: string): PendingTaskCall | undefined;
    /**
     * Peek a pending call for a parent, preferring one whose agentType
     * matches `agentHint`. Used by session.created early registration:
     * when a parent launches several parallel task tools with different
     * subagent types (e.g. council reviewers), `info.agent` on the
     * child session identifies which subagent started it, so we can
     * avoid attributing the child to the wrong pending call.
     * Falls back to the oldest pending call for the parent when no
     * agent match is found (preserves prior behavior).
     */
    peekByParentAndAgent(parentSessionId: string, agentHint?: string): PendingTaskCall | undefined;
    clearSession(sessionId: string): void;
    pendingCallId(sessionID?: string, callID?: string): string;
};