import type { AgentSession, SessionEntry } from "@earendil-works/pi-coding-agent";
export declare const PIX_SYSTEM_MESSAGE_CUSTOM_TYPE = "pix-system";
export declare const PIX_SYSTEM_DISPLAY_ENTRY_CUSTOM_TYPE = "pix:system_message";
export declare const PIX_EXTENSION_ENTRY_ROLE = "pix:extension_entry";
export declare const PIX_SESSION_ENTRY_ID_FIELD = "__pixSessionEntryId";
export declare const PIX_THINKING_LEVEL_FIELD = "__pixThinkingLevel";
export declare function appendPixSystemDisplayEntry(session: AgentSession, text: string): void;
export declare function sessionHistoryDisplayMessages(session: AgentSession): readonly unknown[];
export type SessionHistoryOlderMessagesReader = {
    hasOlder(): boolean;
    readOlder(limit: number): Promise<readonly unknown[]>;
};
export declare function sessionHistoryOlderMessagesReader(session: AgentSession): SessionHistoryOlderMessagesReader | undefined;
export declare function sessionHistoryDisplayMessagesFromEntries(branch: readonly SessionEntry[]): readonly unknown[];
export type FullBranchSessionEntryReader = {
    readFullBranchEntries(): Promise<readonly SessionEntry[]>;
};
export declare function sessionHistoryFullBranchEntries(session: AgentSession): Promise<readonly SessionEntry[]>;