/** Converse cachePoint unions and usage, shared by complete and stream.
 * AWS contracts: /APIReference/API_runtime_{CachePointBlock,TokenUsage,Tool,
 * SystemContentBlock,ContentBlock}.html and /userguide/prompt-caching.html.
 * Model eligibility and TTL restrictions have one owner: bedrockModels.ts.
 */
import type { PromptCaching, CacheMarker } from '../../cache/types.js';
export interface BedrockCachePoint {
    cachePoint: {
        type: 'default';
        ttl?: '1h';
    };
}
export interface BedrockMessagePosition {
    readonly message: number;
    readonly content: number;
}
interface MarkableBody {
    system?: unknown[];
    messages: {
        content: unknown[];
    }[];
    toolConfig?: {
        tools: unknown[];
    };
}
export interface BedrockCacheUsage {
    readonly inputTokens: number;
    readonly outputTokens: number;
    readonly cacheReadInputTokens?: number;
    readonly cacheWriteInputTokens?: number;
}
export declare function bedrockPromptCaching(model: string): PromptCaching | undefined;
/** Translate only valid original boundaries; a dropped message never marks a
 * neighbor. Deduplicate, cap, then insert backwards so indices never shift.
 * TTLs follow wire order (tools → system → messages), independent of marker
 * arrival order: a long TTL after a short one is safely reduced to default.
 */
export declare function applyCacheMarkers(body: MarkableBody, markers: readonly CacheMarker[], model: string, positions: readonly (BedrockMessagePosition | undefined)[]): void;
/** Present zero is measured; absent or malformed cache counters stay absent.
 * inputTokens is fresh input (AWS excludes both cache reads and writes), the
 * same semantics the port cache meter expects from Anthropic's adapter. */
export declare function readCacheUsage(usage: BedrockCacheUsage | undefined): {
    cacheRead?: number;
    cacheWrite?: number;
};
export {};