MeteoSwiss MCP Server

/** * Helper functions for handling validation errors in a user-friendly way */ import type { z } from 'zod'; /** * Formats a Zod error into a user-friendly message * @param error - The Zod error to format * @returns A formatted error message string */ export function formatZodError(error: z.ZodError): string { const messages = error.errors.map((err) => { if (err.path.length > 0) { return `${err.path.join('.')}: ${err.message}`; } return err.message; }); // Return a clean, user-friendly message if (messages.length === 1) { return messages[0] ?? 'Validation error'; } return `Multiple validation errors:\n${messages.map((m) => `- ${m}`).join('\n')}`; } /** * Creates a validation wrapper that provides better error messages * @param schema - The Zod schema to validate against * @param toolName - The name of the tool for error context * @returns A validation function that throws user-friendly errors */ export function createValidator<T>(schema: z.ZodSchema<T>, toolName: string) { return async (params: unknown): Promise<T> => { const result = await schema.safeParseAsync(params); if (!result.success) { const formattedError = formatZodError(result.error); throw new Error(`Invalid parameters for ${toolName}: ${formattedError}`); } return result.data; }; }