Opencode Zod schema validation issue

issue.ts

import { createOpencodeClient, createOpencodeServer } from "../packages/sdk/js/src"

const server = await createOpencodeServer({ port: 9090 })
try {
  const client = await createOpencodeClient({ baseUrl: server.url })
  const { data: session } = await client.session.create({ body: { title: "test session" } })
  if (!session) throw new Error("Unable to create new session")

  const { data: result, error } = await client.session.prompt({
    path: { id: session.id },
    body: {
      parts: [{ type: "text", text: "What files are in the current directory?" }],
      model: {
        providerID: "anthropic",
        modelID: "claude-sonnet-4-20250514",
      },
    },
  })

  if (result) console.log(result)
  else if (error) throw error
} catch (error: any) {
  console.error("error" in error ? error.error : error)
} finally {
  await server.close()
}