import type { SessionContextUsage } from "../types.js";
export declare function cloneContextUsage(contextUsage?: SessionContextUsage): SessionContextUsage | undefined;
import type { DurableSessionRuntime } from "./state.js";
import type { MessageSender } from "../message-sender.js";
/**
 * The one-shot system preamble issued when a session becomes multi-writer.
 * Establishes owner priority: behavioral prioritization, not access control
 * (unauthorized messages never reach the queue in the first place).
 */
export declare function buildSharedSessionPreamble(ownerDisplay?: string): string;
/**
 * Update multi-writer tracking state from a sender-carrying message.
 * Returns the normalized sender (or undefined for junk/absent senders).
 */
export declare function noteMessageSender(runtime: DurableSessionRuntime, rawSender: unknown): MessageSender | undefined;
/** Prefix message text with its [FROM: …] attribution once the session is multi-writer. */
export declare function applySenderAttribution(runtime: DurableSessionRuntime, sender: MessageSender | undefined, text: string): string;
/** Queue the one-shot [SHARED SESSION] preamble for the next turn when multi-writer flips on. */
export declare function maybeQueueSharedPreamble(runtime: DurableSessionRuntime): void;
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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