Function messageError

packages/ai-opencode/src/stream/translate.ts:85–90

(
  message: OpencodeAssistantMessage,
)

  part.type === 'tool'

function messageError(
  message: OpencodeAssistantMessage,
): { message: string } | undefined {
  if (!message.error) return undefined
  return { message: message.error.data?.message ?? message.error.name }
}

/**
 * Translate an OpenCode event stream into AG-UI StreamChunk events.