import type { SessionTreeEntry } from "@earendil-works/pi-agent-core";
import type { AnyModel, Message, ProviderResponse, Tool } from "@earendil-works/pi-ai";
export type PiServerProviderCallbackRequest = {
    callbackId: string;
    kind: "payload";
    model: AnyModel;
    payload: unknown;
} | {
    callbackId: string;
    kind: "response";
    model: AnyModel;
    response: ProviderResponse;
};
export interface PiServerStaticContext {
    systemPrompt?: string;
    tools?: Tool[];
}
export declare function hashPiServerStaticContext(context: PiServerStaticContext | undefined): string;
export declare function hashPiServerProviderMessages(messages: readonly Message[]): string;
export declare const PI_SERVER_EMPTY_TREE_HASH: string;
export declare function hashPiServerTreeEntry(entry: SessionTreeEntry): string;
export declare function appendPiServerTreeHash(previousHash: string, entryHash: string): string;
export declare function buildPiServerTreePrefixHashes(entries: SessionTreeEntry[]): string[];
export declare function hashPiServerSessionEntries(entries: SessionTreeEntry[]): string;
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