import { MossError } from '../../errors.js';
import type { ChatOptions, InternalContentBlock } from './moss-agent-types.js';
export declare function buildUserMessageContent(text: string, attachments: ChatOptions['attachments'] | undefined): string | InternalContentBlock[];
export declare function formatAgentError(error: unknown): string;
export declare function createPreAbortedRunError(sessionKey: string, reason: unknown): MossError;
export declare function createInputGuardrailDeniedError(sessionKey: string, runId: string, reason: string): MossError;
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