import type { ModelTurnError } from './run-output-sink';
import type { StreamChunk, TokenUsage, McpConnectionFailedEvent } from '../../types';
import type { AgentMessage, ContentToolCall } from '../../types/sdk/message';
import type { RawProviderError } from '../model/raw-error';
export declare function normalizeInput(input: AgentMessage[] | string): AgentMessage[];
export declare function stringifyError(error: unknown): string;
export declare function formatMcpConnectionNote(failures: readonly McpConnectionFailedEvent[]): string | undefined;
export declare function classifyModelTurnError(turn: {
    aiFinishReason: string;
    newMessages: AgentMessage[];
    providerError?: RawProviderError;
}): ModelTurnError | undefined;
export declare function isEmptyModelTurn(turn: {
    aiFinishReason: string;
    newMessages: AgentMessage[];
    structuredOutput?: unknown;
    errorReason?: ModelTurnError;
}): boolean;
export declare function extractSettledToolCalls(messages: AgentMessage[]): ContentToolCall[];
export declare function makeErrorStream(error: unknown): ReadableStream<StreamChunk>;
export declare function mergeUsage(current: TokenUsage | undefined, next: TokenUsage | undefined): TokenUsage | undefined;