/**
 * Instrumented MCP server — patches registerTool to wrap callbacks with timing.
 * Zero changes to any tool file — instrumentation is invisible to them.
 */
import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import type { MetricsCollector } from "./metrics-collector.js";
/**
 * Patch the server's registerTool method to wrap all tool callbacks with
 * timing instrumentation. Returns the same server instance (mutated).
 */
export declare function createInstrumentedServer(server: McpServer, collector: MetricsCollector): McpServer;
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