/**
 * Extract a human-readable error string from an MCP isError result object.
 *
 * Shared utility — no side effects, no dependencies on other SDK modules —
 * so it can be imported from the neurolink.ts event loop, the telemetry
 * instrumentation (which loads earlier), and the MCP discovery layer without
 * creating circular imports. Any change to truncation or content-type parsing
 * must happen here and propagate to all three surfaces.
 */
export declare function extractMcpErrorText(raw: unknown): string;