/**
 * Host memory injection block formatter.
 *
 * Converts raw fact objects into structured text blocks that get injected into
 * an LLM host's context window. The format uses stable F-prefixed fact IDs,
 * entity/key attribution, and operating instructions so the host knows to
 * prefer injected facts over re-inference.
 *
 * Compact mode: facts with confidence ≥ 90 and age ≤ 7 days are rendered in
 * a shorter one-line form (omitting confidence, source detail, and lastUpdated)
 * to reduce token noise for high-signal recent facts.
 *
 * Key exports:
 *   - formatStructuredFactBlock()  — render a fact array into an injection block
 *   - assignStructuredFactIds()    — stamp F-prefixed IDs onto facts
 *   - splitEntityKey()             — split "type/id/key" into entity + key parts
 *   - StructuredHostMemoryFact     — typed fact with guaranteed factId
 */
type HostMemoryFactInput = {
    factId?: string;
    entityKey: string;
    summary: string;
    value?: unknown;
    confidence: number;
    source: string;
    lastUpdated?: string;
};
export type StructuredHostMemoryFact<T extends HostMemoryFactInput = HostMemoryFactInput> = T & {
    factId: string;
};
type StructuredFactBlockOptions = {
    title: string;
    includeValues?: boolean;
    introLines?: string[];
};
export declare function splitEntityKey(entityKey: string): {
    entity: string;
    key: string;
};
export declare function assignStructuredFactIds<T extends HostMemoryFactInput>(facts: T[]): Array<StructuredHostMemoryFact<T>>;
export declare function formatStructuredFactBlock<T extends HostMemoryFactInput>(facts: T[], options: StructuredFactBlockOptions): string;
export {};
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