mcp-api-migration-mcp-sdk-directly-calls-internal-zod-methods-def-pa-dca765f2

THEN Create a compatibility layer that checks for the '_zod' property to detect Zod v4. For Zod v4, use the top-level z.parse() and z.safeParse() functions instead of instance methods. For Zod v3, fall back to schema.parse().

function parseWithZod(schema: any, data: any) {
  if ('_zod' in schema) {
    // Zod v4 – top-level parse
    return z.parse(schema, data);
  } else {
    // Zod v3 – instance method
    return schema.parse(data);
  }
}