Hevy MCP

/** * Preprocessor to handle MCP clients that send JSON-stringified arrays * instead of native arrays for complex parameters. * * This is used with Zod's z.preprocess to handle cases where MCP clients * serialize complex nested structures as JSON strings. * * @param val - The value to potentially parse * @returns The parsed array if val is a valid JSON string, otherwise returns val unchanged */ export function parseJsonArray(val: unknown): unknown { // Handle case where MCP client sends JSON string instead of array if (typeof val === "string") { try { return JSON.parse(val); } catch { // Let Zod validation handle the error return val; } } return val; }