/**
 * MCP SDK Compatibility Helpers
 *
 * Internal utilities for handling differences between MCP SDK versions.
 * These helpers abstract away SDK-internal details like:
 * - Tool callback/handler property names (changed in SDK 1.24)
 * - Zod schema internal structures (v3 vs v4)
 */
import type { RegisteredTool, ToolCallback } from '../types';
export type ToolFunctionKey = 'callback' | 'handler';
/**
 * Returns the tool function (callback/handler) from a RegisteredTool.
 * Supports both MCP SDK 1.23- (callback) and 1.24+ (handler).
 */
export declare function getToolFunction(tool: RegisteredTool): ToolCallback;
/**
 * Returns the property key name used for the tool function ("callback" or "handler").
 * This preserves the original property name when wrapping tools.
 */
export declare function getToolFunctionKey(tool: RegisteredTool): ToolFunctionKey;
/**
 * Returns true if the tool has a callback or handler property.
 */
export declare function hasToolFunction(tool: unknown): tool is RegisteredTool;
/**
 * Creates a new tool object with the wrapped function, preserving the original property name.
 * This ensures MCP SDK 1.24+ gets back a tool with "handler" and 1.23- gets "callback".
 */
export declare function createWrappedTool(originalTool: RegisteredTool, wrappedFunction: ToolCallback): RegisteredTool;
export declare function isZ4Schema(schema: unknown): boolean;
export declare function isZodRawShapeCompat(schema: unknown): schema is Record<string, unknown>;
export declare function getObjectShape(schema: unknown): Record<string, unknown> | undefined;
/**
 * Reads the method name a `setRequestHandler` registration is for.
 *
 * The two SDK majors disagree on what the first argument is: v1 passes the Zod
 * schema for the request and carries the method as a literal on its shape, v2
 * passes the method string itself. A registration we cannot name is one we
 * cannot match against a patch — which is how a handler registered after
 * `instrument()` on v2 ends up replacing our wrapper instead of being wrapped.
 */
export declare function readRequestHandlerMethod(requestSchema: unknown): string | undefined;
export declare function getLiteralValue(schema: unknown): unknown;
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