/**
 * Safe metadata filtering for observability exporters.
 *
 * Only these attribute keys are forwarded to third-party backends as trace
 * metadata. User prompts (input), LLM responses (output), error stacks, and
 * any other potentially sensitive data are excluded to prevent PII leaks.
 */
import type { SpanAttributes } from "../../types/index.js";
export declare const SAFE_METADATA_KEYS: Set<string>;
export declare function filterSafeMetadata(attributes: SpanAttributes): Record<string, unknown>;