import type { CompatibleRequestHandlerExtra, MCPAnalyticsData, MCPRequestLike, McpEvent } from '../types';
/**
 * Helpers shared by the low-level (`instrument-lowlevel.ts`) and high-level
 * (`instrument-highlevel.ts`) MCP server wrappers. Extracted so both paths stay in sync — any change to
 * "what counts as an error result", "how do we resolve customer event
 * properties", "where do we find the context argument", or "how do we measure
 * duration" needs to land in one place.
 */
/**
 * MCP tool results signal errors by setting `isError: true` on the result
 * object rather than throwing. Detect that consistently.
 */
export declare function isToolResultError(result: unknown): boolean;
/**
 * Resolves the `eventProperties` callback (if configured) and stamps the
 * result onto the event. No-op when the callback is absent or returns nullish.
 */
export declare function applyResolvedMetadata(event: McpEvent, data: MCPAnalyticsData, request: MCPRequestLike, extra?: CompatibleRequestHandlerExtra): Promise<void>;
/**
 * Reads the SDK-injected `context` argument off a tool-call request. Returns
 * the trimmed string when present, otherwise `undefined`.
 */
export declare function getContextArgument(request: MCPRequestLike): string | undefined;
/**
 * Wall-clock duration of a tracked operation in milliseconds, from `event.timestamp`
 * to now. Returns `0` when timestamp is missing so callers don't have to null-check.
 */
export declare function getEventDuration(event: McpEvent): number;
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