import type { ContentPart, ImageContentPart } from "./types";
/**
 * Returns true when a tool result carries the MCP `isError: true` flag.
 * Used by both the live tool loop and the replay path so a tool that
 * successfully returns `{ isError: true, content: [...] }` is treated the
 * same as one that threw.
 */
export declare function isToolResultError(result: unknown): boolean;
export declare function extractToolResultParts(result: unknown): ContentPart[];
/**
 * Convenience wrapper used by `toolLoop` and `messageFormat`: returns a string
 * for text-only results and a `ContentPart[]` when any non-text part (currently
 * just images) is present.
 */
export declare function toolResultToContent(result: unknown): string | ContentPart[];
/**
 * Split a tool-message `content` field into joined text + image parts. Used by
 * providers (OpenAI, Gemini) that can't carry image bytes inside their tool
 * role and must forward them as a synthetic follow-up user turn.
 */
export declare function partitionToolContent(content: string | ContentPart[]): {
    text: string;
    imageParts: ImageContentPart[];
    isString: boolean;
};
/** Header text introducing image bytes that follow a tool result. */
export declare function toolImageFollowupHeader(toolName: string | undefined, count: number): string;
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