import { type ModelMessage } from "ai";
import { type HarnessStepResult } from "#harness/step-hooks.js";
import type { StepFn, ToolLoopHarnessConfig } from "#harness/types.js";
export declare function createToolLoopHarness(config: ToolLoopHarnessConfig): StepFn;
type ToolResponsePart = Extract<ModelMessage, {
    role: "tool";
}>["content"][number];
type ToolResultPart = Extract<ToolResponsePart, {
    type: "tool-result";
}>;
type StepResponseMessage = HarnessStepResult["response"]["messages"][number];
/**
 * Appends synthesized tool results for calls that have no result anywhere in
 * the step's response messages. Exported for its dedupe contract: a call
 * already answered — including provider-executed results the SDK keeps
 * inline in the assistant message — must never receive a second
 * `tool-result`, or the next Anthropic call rejects the history with
 * "each tool_use must have a single result".
 */
export declare function appendMissingToolResultMessages(input: {
    readonly append: readonly ToolResultPart[];
    readonly responseMessages: readonly StepResponseMessage[];
}): StepResponseMessage[];
export {};