import type { SessionContextUsage } from "../types.js";
export declare function cloneContextUsage(contextUsage?: SessionContextUsage): SessionContextUsage | undefined;
export declare function mergePrompt(existingPrompt?: string, nextPrompt?: string): string | undefined;
export declare function extractPromptSystemContext(rawPrompt?: string): {
    prompt?: string;
    systemPrompt?: string;
};
export declare function appendSystemContext(rawPrompt: string | undefined, extraSystemPrompt?: string): string | undefined;
export declare function validClientMessageIds(value: unknown): string[];
export declare function updateContextUsageFromEvents(previous: SessionContextUsage | undefined, events: Array<{
    eventType?: string;
    data?: any;
}> | undefined, observedAt: number): SessionContextUsage | undefined;
export declare const COPILOT_CONNECTION_CLOSED_MAX_RETRIES = 3;
export declare const COPILOT_CONNECTION_CLOSED_RETRY_DELAY_SECONDS = 15;
export declare function isCopilotConnectionClosedError(message?: string): boolean;
export declare function isAuthFailureError(message?: string): boolean;
export declare const AUTH_FAILURE_USER_HINT: string;
export declare function buildConnectionClosedRetryDetail(retryAttempt: number): string;
export declare function buildLossyHandoffSummary(errorMessage: string): string;
export declare function buildLossyHandoffRehydrationMessage(errorMessage: string): string;
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