/**
 * Formats user-facing messages for context reset events.
 * Pure function — no side effects.
 */
export type MessageContextResetKind = "compaction" | "manual" | "overflow";
export type MessageContextResetOptions = {
    kind: MessageContextResetKind;
    estimatedTokens?: number;
};
/**
 * Builds a user-facing notification for context reset events.
 * Expects: estimatedTokens >= 0 when provided.
 */
export declare function messageContextReset(options: MessageContextResetOptions): string;
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