import { type UsageReceipt } from "./artifacts.ts";
import type { AgentState } from "./graph.ts";
export type Invocation = {
    version: 1;
    id: string;
    preparationId: string;
    nodeId: string;
    status: "reserved" | "settled";
    reservedTokens: number;
    startedAt: string;
    receipt?: UsageReceipt;
};
export declare function readInvocations(root: string): Invocation[];
export declare function invocationSpend(root: string): {
    calls: number;
    inputTokens: number;
    outputTokens: number;
    tokens: number;
    durationMs: number;
    reservedTokens: number;
    unknownCalls: number;
};
export declare function syncInvocationSpend(root: string, state: AgentState): void;
export declare function reserveInvocation(opts: {
    root: string;
    preparationId: string;
    nodeId: string;
    maxTokens: number;
    totalTokenLimit?: number;
    otherTokens?: number;
}): Invocation;
export declare function settleInvocation(root: string, id: string, receipt: UsageReceipt): Invocation;