type AnthropicUsagePayload = {
    input_tokens?: unknown;
    output_tokens?: unknown;
    cache_read_input_tokens?: unknown;
    cache_creation_input_tokens?: unknown;
    iterations?: unknown;
};
export type AnthropicPromptUsageSnapshot = {
    input: number;
    cacheRead: number;
    cacheWrite: number;
};
export type AnthropicIterationUsageSnapshot = {
    contextPromptTokens: number;
    totalTokens: number;
};
export type AnthropicIterationUsageResult = {
    state: "absent";
} | {
    state: "invalid";
} | {
    state: "valid";
    usage: AnthropicIterationUsageSnapshot;
};
export declare function readAnthropicUsageTokenCount(value: unknown): number | undefined;
export declare function readAnthropicPromptUsageSnapshot(usage: AnthropicUsagePayload): AnthropicPromptUsageSnapshot | undefined;
export declare function readLastAnthropicIterationUsage(usage: AnthropicUsagePayload): AnthropicIterationUsageResult;
export {};