import type { TurnId } from '../../types/ids/index.js';
import type { SessionRecord } from '../../types/session/records.js';
import type { SessionEventDraft } from './events.js';
export declare function assertMaxToolCalls(limit: number | undefined): void;
/** A turn-owned admission ledger; durability belongs to the session log. */
export declare class ToolCallBudget {
    private readonly limit;
    private readonly turnId;
    private readonly emit;
    private readonly read?;
    private used;
    private initialized?;
    private chain;
    private failed;
    constructor(limit: number, turnId: TurnId, emit: (event: SessionEventDraft) => Promise<void>, read?: (() => Promise<readonly SessionRecord[]>) | undefined);
    private initialize;
    /** Reserve before work, never refund. A refused group consumes no new slots. */
    admit(count: number, kind: 'batch' | 'nested' | 'retry', signal: AbortSignal): Promise<string | undefined>;
}
//# sourceMappingURL=tool-call-budget.d.ts.map