import { SchemaInput } from '../../../types.js';
/**
 * How a failed tool input is repaired. `undefined`: the built-in repair.
 * `false`: no repair. A function: called instead of the built-in repair. It
 * returns the input to check again, or `undefined` to keep the error.
 */
export type ToolInputRepair = false | ((input: unknown, error: Error) => unknown | Promise<unknown>);
/**
 * The final check of a tool input, just before the tool runs or the client
 * gets the call. A Standard Schema runs here (an async validator too), and
 * its output is the input, so transforms apply once. A JSON Schema (an MCP
 * tool, a plain JSON Schema tool) is checked with `@cfworker/json-schema`.
 * A failed input is repaired as `repair` says, then checked again. The error
 * of the first check goes back to the model as the tool result.
 */
export declare function validateToolInput(schema: SchemaInput | boolean | undefined, received: unknown, toolName: string, repair?: ToolInputRepair): Promise<unknown>;